AGMODELS-L: 199509XX

is the compilation of discussion during Sep 95

via AB4EL Web Digests @ SunSITE

AGROMOMY Homepage @ SunSITE


>From root@crcnis1.unl.edu Fri Sep  1 09:36 EDT 1995
Date: Fri, 1 Sep 1995 08:20:03 -0500
Message-Id: <199509011320.AA04009@crcnis1.unl.edu>
Subject: AGMODELS-L digest 338

Contents:
     Re: Sugarbeet growth data (DON WAUCHOPE <DON@TIFTON.BITNET>)
Soil temperature models (Val Snow <vos@adl.dwr.csiro.au>)



Date: Thu, 31 Aug 95 17:47:19 EDT From: DON WAUCHOPE <DON@TIFTON.BITNET> Subject: Re: Sugarbeet growth data On Thu, 31 Aug 1995 08:10:29 -0500 Rabi H. Mohtar said: >Hello, >A colleague from Michigan State is looking for leaf area index data on >non-fertilized sugarbeet. If you know of any leads she will be grateful. >You can contact her directly for any information at: >zinatigl@pilot.msu.edu >Thank you. > >Sincerely, >Rabi Mohtar > You might try asking Earl Ruppel at the ARS sugarbeet research unit at Ft. Collins, CO A03RLCRL@attmail.com
Date: Fri, 01 Sep 1995 16:54:15 +1100 From: Val Snow <vos@adl.dwr.csiro.au> Subject: Soil temperature models Hello - I am passing on a query from a colleague regarding soil temperature models. If anyone can help please reply to Dave Campbell on davec@waikato.ac.nz. Thank you. >I've been pestering people for models of soil temperature, and I'm surprised >that they are so difficult to come across, in a nicely packaged format that >says "use me". > >One of my MSc students is working on Antarctic soils, describing the factors >affecting the summer diurnal thermal regime. He has sets of temperature >profile measurements that we obtained last summer for several sites, and has >been measuring soil thermal properties. What we need now is a soil thermal >model that he can use to test hypotheses about differences in observed >temperature regimes, preferably something that can handle variations in soil >properties with depth, and using either surface temperature measurements or >solar/net radiation as forcing variables. The soils are all bare and >relatively dry. > >About all we have come across are those in G.S. Campbell's book "Soil >Physics with Basic", and that is for a uniform soil. What we need is a >layered one-dim model. Have you used anything or know of a source? _____________________________________________________________________ Val Snow CSIRO Division of Water Resources PB 2 Glen Osmond SA 5064 AUSTRALIA Phone:+61-8-303-8743 Fax:+61-8-303-8750 Email:vos@adl.dwr.csiro.au
End of Digest
>From root@crcnis1.unl.edu Sat Sep  2 09:34 EDT 1995
Date: Sat, 2 Sep 1995 08:20:25 -0500
Message-Id: <199509021320.AA22518@crcnis1.unl.edu>
Subject: AGMODELS-L digest 339

Contents:
Re: Soil temperature models (DarrelllD@aol.com)
unsubscribe (FranMejia@aol.com)
Re: Soil temperature models (alm david michael <alm@ux1.cso.uiuc.edu>)
re: Soil temperature models (KSCHNELLE@dowelanco.com)



Date: Fri, 1 Sep 1995 11:44:38 -0400 From: DarrelllD@aol.com Subject: Re: Soil temperature models Unsubscribe
Date: Fri, 1 Sep 1995 12:45:47 -0400 From: FranMejia@aol.com Subject: unsubscribe unsubscribe
Date: Fri, 1 Sep 1995 13:24:24 -0500 (CDT) From: alm david michael <alm@ux1.cso.uiuc.edu> Subject: Re: Soil temperature models You might contact Yiqi ("eechee") Luo at the Desert Research Institute; he derived some soil temperature equations as a doctoral student at Davis. Modeling soil temperature mechanistically is tricky; many if not most models treat a lot of it empirically. I don't have his e-mail handy, but you should be able to get it from the Univ. Nevada Reno phonebook via gopher.
Date: Fri, 1 Sep 1995 15:19:07 -0500 (EST) From: KSCHNELLE@dowelanco.com Subject: re: Soil temperature models Val Snow <vos@adl.dwr.csiro.au> asked about soil temperature models: The PRZM-II manual reviews 9 soil temp. models and then states how PRZM-II uses van Bavel and Hillel (1976) and Thibodeaux (1979) to estimate upper boundary temperature. Soil profile temps were estimated from Hanks et al (1971), Gupta et al (81,82,83), and Wagenet and Hutson (87) NOTE: PRZM-II is a model from the US EPA that predicts pesticide fate in the crop root zone and unsaturated soil zone. The current version is PRZM-II Version 2, Oct 94. Code and manual available by anonymous ftp at: earth1.epa.gov Karl Schnelle DowElanco Indianapolis, USA kschnelle@dowelanco.com
End of Digest
>From ab4el@ab4el.com Sun Sep  3 00:01 EDT 1995
Date: Sun, 3 Sep 1995 00:01:00 -0500
Message-Id: <19950903000100.ab4el@ab4el.com>
Subject: AGMODELS-L digest 340 was NOT received

AGMODELS-L digest 340 was NOT received



>From root@crcnis1.unl.edu Tue Sep  5 09:13 EDT 1995
Date: Tue, 5 Sep 1995 08:00:50 -0500
Message-Id: <199509051300.AA02494@crcnis1.unl.edu>
Subject: AGMODELS-L digest 341

Contents:
 (boccia@alsroma.roma.alespazio.it (Marco Bocciarelli))
 (boccia@alsroma.roma.alespazio.it (Marco Bocciarelli))
help (boccia@alsroma.roma.alespazio.it (Marco Bocciarelli))



Date: Tue, 5 Sep 1995 08:43:59 +0200 From: boccia@alsroma.roma.alespazio.it (Marco Bocciarelli) Subject: HELP
Date: Tue, 5 Sep 1995 08:52:36 +0200 From: boccia@alsroma.roma.alespazio.it (Marco Bocciarelli) Subject: INFO DATABASE
Date: Tue, 5 Sep 1995 10:24:02 +0200 From: boccia@alsroma.roma.alespazio.it (Marco Bocciarelli) Subject: help
End of Digest
>From root@crcnis1.unl.edu Wed Sep  6 09:23 EDT 1995
Date: Wed, 6 Sep 1995 08:03:05 -0500
Message-Id: <199509061303.AA22658@crcnis1.unl.edu>
Subject: AGMODELS-L digest 342

Contents:
Re: Irrigation scheduling model for trees ("Marshall J. English" <englishm@ccmail.orst.edu>)
Re: No Subject (DarrelllD@aol.com)
Re: help (ANTHONY7@delphi.com)



Date: Tue, 05 Sep 95 08:28:51 PST From: "Marshall J. English" <englishm@ccmail.orst.edu> Subject: Re: Irrigation scheduling model for trees You might be interested in a model developed by the New Zealand Ministry of Ag and Fisheries and Oregon State University. It does not compute reference ET (such as Penman) but requires reference ET as an input. However it then uses reference ET to determine the required interval between irrigations. The model accounts for spatial variability of soil characteristiccs and application patterns. Wind run is used to adjust uniformity for sprinklers on a day by day basis. Spatial variations in applications and infiltration are used to establish runoff and redistribution patterns. Sprinkler design parameters (nozzle size, pressure) are used in conjunction with wind runs to establish spray loss and redistribution rates. All of these factors impact soil water distribution, which in turn impacts the required timing of irrigations. The user specifies the management rules, such as the degree of soil water depeletion at which an irrigation should be called for, and the portion of the field that the system will be managed for (e.g. the portion that represents the 80th percentile of moisture holding capacity). The model is described in ICID Bulletin, Vol. 41 No. 2, 1992. If you need a copy I will be happy to send one. Marshall English Bioresource Engineering Oregon State University Corvallis OR, 97331 USA 503-737-6308 FAX 503-737-2082
Date: Tue, 5 Sep 1995 20:10:58 -0400 From: DarrelllD@aol.com Subject: Re: No Subject unsubscribe
Date: Tue, 05 Sep 1995 22:38:22 -0400 (EDT) From: ANTHONY7@delphi.com Subject: Re: help Does this mailing list have anything to do with 'Farm Toys'?
End of Digest
>From root@crcnis1.unl.edu Thu Sep  7 09:49 EDT 1995
Date: Thu, 7 Sep 1995 08:28:13 -0500
Message-Id: <199509071328.AA15633@crcnis1.unl.edu>
Subject: AGMODELS-L digest 343

Contents:
no subject (FranMejia@aol.com)
Reminder  re: using the listserver ("John P. Bolte" <boltej@ccmail.orst.edu>)
Re: Irrigation scheduling model for trees (hclyma@engecs1.unl.edu (Howard Clyma))
      Re: Irrigation scheduling model for trees ("Gregory McIsaac" <GFM@age2.age.uiuc.edu>)
Re[2]: Irrigation scheduling model for trees ("Marshall J. English" <englishm@ccmail.orst.edu>)
Irrigation scheduling models (Tivi.Theiveyanathan@cbr.for.csiro.au (Tivi Theiveyanathan))
Re: Reminder re: using the listserver (DarrelllD@aol.com)
      A request (MOHAMMAD BANNYAN AVVAL <SBXBAM@sbn2.phes.nottingham.ac.uk>)



Date: Wed, 6 Sep 1995 10:03:15 -0400 From: FranMejia@aol.com Subject: no subject Unsubscribe
Date: Wed, 06 Sep 95 08:49:05 PST From: "John P. Bolte" <boltej@ccmail.orst.edu> Subject: Reminder re: using the listserver Remember - requests for HELP or UNSUBSCRIBE should be sent to the LISTSERVER, not the list. e.g. for HELP, send the HELP message to LISTSERV@unl.edu, NOT the agmodels-l list.
Date: Wed, 6 Sep 1995 11:32:03 -0500 (CDT) From: hclyma@engecs1.unl.edu (Howard Clyma) Subject: Re: Irrigation scheduling model for trees > The model is described in ICID Bulletin, Vol. 41 No. 2, 1992. If > you need a copy I will be happy to send one. > I would be interested in a copy of the bulletin and maybe the model later. Howard ----------------------------------------------------------- Howard Clyma |Office:(402)472-6340 Graduate Research Asstitant |Home:(402)435-3494 Dept. of Biological Systems |Fax::(402)472-6338 Engineering |Internet: 154 L.W. Chase Hall, East Campus |hclyma@engec.unl.edu University of Nebraska-Lincoln |Bitnet: Lincoln, NE 68583-0726 |bsen057@unlvm.unl.edu -----------------------------------------------------------
Date: Wed, 6 Sep 1995 12:32:27 CST From: "Gregory McIsaac" <GFM@age2.age.uiuc.edu> Subject: Re: Irrigation scheduling model for trees Marshall, If its not too much trouble, I would be interested in having a look at this model for teaching purposes. Is it relatively user friendly and adaptable to different crops, soils, etc? Best Regards, Greg McIsaac University of Illinois Agricultural Engineering Department > Date: Tue, 5 Sep 1995 10:29:20 -0500 > Reply-to: <agmodels-l@unl.edu> > From: "Marshall J. English" <englishm@ccmail.orst.edu> > To: Multiple recipients of list <agmodels-l@unl.edu> > Subject: Re: Irrigation scheduling model for trees > You might be interested in a model developed by the New Zealand > Ministry of Ag and Fisheries and Oregon State University. It does not > compute reference ET (such as Penman) but requires reference ET as an > input. However it then uses reference ET to determine the required > interval between irrigations. The model accounts for spatial > variability of soil characteristiccs and application patterns. Wind > run is used to adjust uniformity for sprinklers on a day by day basis. > Spatial variations in applications and infiltration are used to > establish runoff and redistribution patterns. Sprinkler design > parameters (nozzle size, pressure) are used in conjunction with wind > runs to establish spray loss and redistribution rates. All of these > factors impact soil water distribution, which in turn impacts the > required timing of irrigations. The user specifies the management > rules, such as the degree of soil water depeletion at which an > irrigation should be called for, and the portion of the field that > the system will be managed for (e.g. the portion that represents the > 80th percentile of moisture holding capacity). > The model is described in ICID Bulletin, Vol. 41 No. 2, 1992. If > you need a copy I will be happy to send one. > > Marshall English > Bioresource Engineering > Oregon State University > Corvallis OR, 97331 > USA > > 503-737-6308 > FAX 503-737-2082 > >
Date: Wed, 06 Sep 95 12:56:22 PST From: "Marshall J. English" <englishm@ccmail.orst.edu> Subject: Re[2]: Irrigation scheduling model for trees I will send two written items regarding the model. It is "relatively" user freindly, with a rudimentary menu for users not familiar with it. Marshall English
Date: Thu, 7 Sep 1995 15:22:26 +1000 From: Tivi.Theiveyanathan@cbr.for.csiro.au (Tivi Theiveyanathan) Subject: Irrigation scheduling models I am having problems in finding the following publications/articles here in Australia. Could any one please suggest me where I could get a copy of these. Thank you Tivi 1. TI: Irrigation scheduling with "RR-2.0" computerized programme. AU: Ravelli,-F; Rota,-P AD: Agenzia per la Promozione dello Sviluppo del Mezzogiorno, Divisione Irrigazione, Ufficio Agrario. P. le Kennedy, 20. 00144 Rome, Italy. SO: Proceedings International Commission on Irrigation and Drainage Special Technical Session, Beijing, China Vol. 1-B Operation of irrigation systems. 1991, 200-209; 8 ref. Beijing, China; Chinese National Committee ICID. 2. TI: An irrigation scheduling model suitable for reuse of drainage water. AU: Ismail,-ESES; Gowing,-JW AD: Suez Canal Univ. Egypt. SO: Proceedings Symposium on Land Drainage for Salinity in Arid and Semi-arid regions, Cairo. 1990, Vol 3, 195-208; 15 ref. Cairo, Egypt; Drainage Research Institute, WRC (Ministry of Public Works and Water Resources). 3. ICID-Bulletin. 1992, 41: 2 4. TI: Selection of the best computer irrigation scheduling model. AU: Asare-DK; Sammis-TW; Assadian-H; Fowler-JF AD: Dep. Agronomy and Horticulture, New Mexico State Univ., Las Cruces, NM 88003, USA. SO: Proceedings of international conference on advances in planning, design and management of irrigation systems as related to sustainable land use, Leuven. 1992, 825-833; 9 ref.
Date: Thu, 7 Sep 1995 07:07:03 -0400 From: DarrelllD@aol.com Subject: Re: Reminder re: using the listserver Thats a great idea....but when the commands don't work, people will try anything.
Date: Thu, 7 Sep 1995 14:01:15 GMT From: MOHAMMAD BANNYAN AVVAL <SBXBAM@sbn2.phes.nottingham.ac.uk> Subject: A request Dear All I would appreciate anyone who could send me , any handouts, paper exam, and software which could be usefull in teaching crop modelling. Your help, as any as, will be gratefull. Mohammad Bannayan Universtiy of Nottingham Sutton Bonington Dept. of ENVs Leics, LE12 5DF UK E-Mail: sbxbam@sbn2.nott.ac.uk
End of Digest
>From root@crcnis1.unl.edu Fri Sep  8 09:53 EDT 1995
Date: Fri, 8 Sep 1995 08:29:32 -0500
Message-Id: <199509081329.AA07656@crcnis1.unl.edu>
Subject: AGMODELS-L digest 344

Contents:
Re: A request (salvador@iastate.edu)
Re: A request (jhaskett@asrr.arsusda.gov)
Prediction of crop yield (KSCHNELLE@dowelanco.com)
position available (Joachim Benz <benz@wiz.uni-kassel.de>)
 (boccia@alsroma.roma.alespazio.it (Marco Bocciarelli))
Re: A request (Tim Hess <T.Hess@cranfield.ac.uk>)
      Re: A request (Graham Russell <GRUSSELL@srv0.bio.ed.ac.uk>)
 (boccia@alsroma.roma.alespazio.it (Marco Bocciarelli))
 (boccia@alsroma.roma.alespazio.it (Marco Bocciarelli))
      Re: A request (MOHAMMAD BANNYAN AVVAL <SBXBAM@sbn2.phes.nottingham.ac.uk>)



Date: Thu, 7 Sep 1995 08:30:33 -0700 From: salvador@iastate.edu Subject: Re: A request Mohammed Banny writes: >I would appreciate anyone who could send me , any handouts, paper >exam, and software which could be usefull in teaching crop modelling. A group of us teach a course in "Agronomic Systems Simulation" at the graduate level here (the group consists of a soil physicist, a mesoscale meteorologist, and a crop physiologist). You can review details about our course at the following Web location: http://www.public.iastate.edu/~rjsalvad/agron650.html In addition, my colleague Bill Batchelor (bbatch@iastate.edu) teaches a course in Crop Simulation at the graduate level for the Agricultural and Biosystems Engineering program here. I am sure that if you contact him directly he would be willing to share his information. Ricardo Salvador Internet: salvador@IASTATE.EDU 1126 Agronomy Hall Iowa State University Voice: (515) 294-9595 Ames, IA 50011-1010 FAX: (515) 294-3163 <http://www.public.iastate.edu/~rjsalvad/homepage.html>
Date: Thu, 7 Sep 1995 10:53:55 -0400 (EDT) From: jhaskett@asrr.arsusda.gov Subject: Re: A request A really good software package for teaching modelling is "STELLA II" it is available from: High Performance Systems Inc. 45 Lyme Road, Suite 300 Hanover, NHJ 03755 USA 603-643-9636 FAX 603-643-95 02 Hope this helps. Cheers, Jonathan Haskett On Thu, 7 Sep 1995, MOHAMMAD BANNYAN AVVAL wrote: > Dear All > I would appreciate anyone who could send me , any handouts, paper > exam, and software which could be usefull in teaching crop modelling. > Your help, as any as, will be gratefull. > Mohammad Bannayan > Universtiy of Nottingham > Sutton Bonington > Dept. of ENVs > Leics, LE12 5DF > UK > E-Mail: sbxbam@sbn2.nott.ac.uk > ******************************************************************* ******************************************************************* Jonathan Haskett jhaskett@asrr.arsusda.gov "The fault dear Brutus lies not within our stars but in ourselves."
Date: Thu, 7 Sep 1995 16:30:24 -0500 (EST) From: KSCHNELLE@dowelanco.com Subject: Prediction of crop yield Dear agmodels-l, I have seen a few posts to agmodels-l mentioning crop yields (from Meindert de Jong <TPEJONG@RCL.WAU.NL> in March and from Graham Russell <GRUSSELL@srv0.bio.ed.ac.uk> in May). At that time I was more involved in soil carryover and leaching modeling. Now I would like to find out more about the state-of-the-art in crop yield prediction. I am researching this for DowElanco as a possible future research area. I would be interested in any models or systems that deal with assessing yields. For example, I have recently seen the paper by A K L Johnson, et al, in Soil Use and Management (1994) that uses an expert system to take yields and predict economic return. Are researchers more involved with building your own yield models for specific crops, or if not where are you getting your models. There seem to be many researchers looking at crop specific models to assess the affects of global climate change or weed stress. Does anyone have plans to hook any yield models into a GIS (such as Han, et al, 1995) or do Monte Carlo modeling (Aggarwal, 1995)? What do you see as the major bottlenecks to advancing yield prediction in the next 5 or 10 years? And what might be the outcome of this technology 10 years from now? I apologize for asking so many questions, but I would like to learn more about this area. Your opinions and any information would be greatly appreciated. Perhaps this will stimulate some discussion on the list as opposed to only SPAM coming across recently :) I'll be happy to summarize and post it back to the list if anyone would rather email me directly. Karl Schnelle, PhD DowElanco R&D 9330 Zionsville Rd. Indianapolis, IN 46268 USA kschnelle@dowelanco.com
Date: Fri, 8 Sep 1995 09:04:37 +0200 (MES) From: Joachim Benz <benz@wiz.uni-kassel.de> Subject: position available University of Kassel Faculty of Agriculture, International rural development and Environmental protection Dept. for Forage Production and Grassland Ecology Position available ------------------ In the research project "Synthese und Konsistenzpr"ufung komplexer modular-hierarchischer "Okosystemmodelle " we offer either 1 Post-doc position (BAT IIa) or 2 positions for PhD students (BAT IIa/2). The position(s) are initially limited to 2 years. This research project is a cooperation between the university of Kassel, faculty of agriculture, international rural development and environmental protection and the university of Rostock, faculty of computer science, both in Germany. The job location is Witzenhausen (a satellite campus of the university of Kassel), some 30km east of Kassel. Duties within the project include: ---------------------------------- - development of algorithms for the synthesis and the consistency check of complex mathematical models (in cooperation with the team in Rostock), - optimization of the design of the ECOBAS database (database for the documentation of mathematical formulations of ecological processes), - development of interfaces for the tools for model-construction and consistency check and - maintenance and extension of the ECOBAS database (Some information about ECOBAS can be found at http://dino.wiz.uni-kassel.de/ecobas.html) Required_qualifications: ------------------------ A completed degree in computer science or in a ecology related discipline. Experience with mathematical modelling in ecology and/or databases is desirable as its familiarity with UNIX. Knowledge of German would be of advantage. contact: -------- Dr. Joachim Benz Universit"at Gesamthochschule Kassel Fachbereich 11 Nordbahnhofstr. 1a D-37213 Witzenhausen Germany Tel.: +49-5542-98-1560 Fax: +49-5542-98-1670 Email: benz@wiz.uni-kassel.de __________________________________________________________________________ The university of Kassel is committed to increase the number of women within its staff. Therefore women are encouraged to apply for the offered positions. With equal qualifications disabled applicants will be preferred.
Date: Fri, 8 Sep 1995 09:55:06 +0200 From: boccia@alsroma.roma.alespazio.it (Marco Bocciarelli) Subject: send usenet/news.answers/finding-addresses
Date: Fri, 08 Sep 1995 09:26:22 EDT From: Tim Hess <T.Hess@cranfield.ac.uk> Subject: Re: A request > From: MOHAMMAD BANNYAN AVVAL <SBXBAM@sbn2.phes.nottingham.ac.uk> > To: Multiple recipients of list <agmodels-l@unl.edu> > Subject: A request > > Dear All > I would appreciate anyone who could send me , any handouts, paper > exam, and software which could be usefull in teaching crop modelling. > Your help, as any as, will be gratefull. > Mohammad Bannayan > Universtiy of Nottingham > Sutton Bonington > Dept. of ENVs > Leics, LE12 5DF > UK > E-Mail: sbxbam@sbn2.nott.ac.uk Regarding models to use, I have made use of PARCH (produced by your department) in teaching APPLICATIONS (rather than modelling). See Rick Bradley for some example material I have produced. --------------------------------------------------------------------- Tim Hess Department of Water Management Silsoe College Cranfield University Silsoe Tel (0)1525 863292 Bedford, MK45 4DT Fax (0)1525 863000 UK e-mail t.hess@silsoe.cranfield.ac.uk ----------------------------------------------------------------------
Date: Fri, 8 Sep 1995 10:08:25 +0000 From: Graham Russell <GRUSSELL@srv0.bio.ed.ac.uk> Subject: Re: A request Mohammad Bannayan wrote: > I would appreciate anyone who could send me , any > handouts, paper exam, and software which could be > useful in teaching crop modelling. To teach my undergraduates the rudiments of crop modelling, I built a small model of spring barley growth in QBASIC. The students access the code and run the model for a range of scenarios by editing the input values. They are then shown how to edit the code itself and are encouraged to make modifications to genetic parameters to try to develop a higher yielding cultivar. I am sure that the secret is to use a simple model and to lay out the code clearly with plenty of comments rather than to go for elegant and efficient programming. Hope this gives you some ideas. Graham Dr G. Russell University of Edinburgh Institute of Ecology & Resource Management (Agriculture Building) West Mains Road Edinburgh EH9 3JG SCOTLAND International phone +44 131 535 4063 Fax +44 131 667 2601 UK phone 031 535 4063 Fax 031 667 2601
Date: Fri, 8 Sep 1995 12:21:21 +0200 From: boccia@alsroma.roma.alespazio.it (Marco Bocciarelli) Subject: send usenet-addresses/nairne
Date: Fri, 8 Sep 1995 12:21:49 +0200 From: boccia@alsroma.roma.alespazio.it (Marco Bocciarelli) Subject: send usenet-addresses/mac
Date: Fri, 8 Sep 1995 11:15:49 GMT From: MOHAMMAD BANNYAN AVVAL <SBXBAM@sbn2.phes.nottingham.ac.uk> Subject: Re: A request Thank you for every thing, your homepage is very good especially with my ideal crop Maize. It would be very helpfull if I could have a copy of your handouts or lecture notes on the followed courses that you teach: -- Agronomic system simulation -- Advanced crop management -- Confronting problems in modern agriculture. Do you have any access to STELL II, and is it possible to send me a copy of that? Sorry for this too much. Mohammad Bannayan Univ. of Notttingham Sutton Bonington, Dept. of ENVs Leics, LE12 5DF UK E-Mail: sbxbam@sbn2.nott.ac.uk
End of Digest
>From root@crcnis1.unl.edu Sat Sep  9 09:40 EDT 1995
Date: Sat, 9 Sep 1995 08:29:33 -0500
Message-Id: <199509091329.AA00954@crcnis1.unl.edu>
Subject: AGMODELS-L digest 345

Contents:
Re: A request (jhaskett@asrr.arsusda.gov)
STELLA II (Tim Hess <T.Hess@cranfield.ac.uk>)
Re: STELLA II ("John P. Bolte" <boltej@ccmail.orst.edu>)
Re: A request (Chris Schroeder <rcs@msilink.com>)
Re: A request (Anthony Vcelka 98 <avcelka@nike.heidelberg.edu>)
Re: A request (Daniel Fuka <dan@quetzalcoatl.com>)



Date: Fri, 8 Sep 1995 10:15:53 -0400 (EDT) From: jhaskett@asrr.arsusda.gov Subject: Re: A request STELLA II is commercial product but is relatively inexpensive. It is an excellent tool and allows students to create working models by drawing process models on screen. The address is: STELLA II High Performance Systems Inc. 45 Lyme Road Suite 300 Hanover, New Hampshire 03755 USA Hope this helps, Jonathan Haskett On Fri, 8 Sep 1995, MOHAMMAD BANNYAN AVVAL wrote: > Thank you for every thing, your homepage is very good especially with > my ideal crop Maize. > It would be very helpfull if I could have a copy of your handouts or > lecture notes on the followed courses that you teach: > -- Agronomic system simulation > -- Advanced crop management > -- Confronting problems in modern agriculture. > Do you have any access to STELL II, and is it possible to send me a > copy of that? > Sorry for this too much. > > Mohammad Bannayan > Univ. of Notttingham > Sutton Bonington, Dept. of ENVs > Leics, LE12 5DF > UK > E-Mail: sbxbam@sbn2.nott.ac.uk > ******************************************************************* ******************************************************************* Jonathan Haskett jhaskett@asrr.arsusda.gov "The fault dear Brutus lies not within our stars but in ourselves."
Date: Fri, 08 Sep 1995 15:30:14 EDT From: Tim Hess <T.Hess@cranfield.ac.uk> Subject: STELLA II Stella II 3.0 and Stella II are available in UK from; Cognitus Systems Ltd 1 Park View Harrogate North Yorkshire HG1 5LY Tel 01423 562622 Fax 01423 675709 Also worth looking at is ModelMaker (reviewed in Agr. & For. Met. 75:265-267). --------------------------------------------------------------------- Tim Hess Department of Water Management Silsoe College Cranfield University Silsoe Tel (0)1525 863292 Bedford, MK45 4DT Fax (0)1525 863000 UK e-mail t.hess@silsoe.cranfield.ac.uk ----------------------------------------------------------------------
Date: Fri, 08 Sep 95 08:44:25 PST From: "John P. Bolte" <boltej@ccmail.orst.edu> Subject: Re: STELLA II VSS (Virtual Systems Simulator) is a Stella-like simulation package geared toward continuous systems. It is free and in the public domain and is available via FTP at ftp.engr.orst.edu. Look in the pub/bag/vss directory. Hope this is useful - John Bolte Bioresource Engineering Dept Oregon State University EMail: boltej@ccmail.orst.edu ______________________________ Reply Separator _________________________________ Subject: STELLA II Author: <agmodels-l@unl.edu> at Internet_gateway Date: 9/8/95 7:28 AM
Date: Sat, 9 Sep 1995 03:48:23 -0500 From: Chris Schroeder <rcs@msilink.com> Subject: Re: A request Ditto on the positive comments about Stella and it's sister program called ithink. Check out the home page for High Performance Systems at: http://www.valley.net/~hps/hps.html They have links to others who are using the program Chris Schroeder At 05:58 AM 9/8/95 -0500, you wrote: >Thank you for every thing, your homepage is very good especially with >my ideal crop Maize. >It would be very helpfull if I could have a copy of your handouts or >lecture notes on the followed courses that you teach: >-- Agronomic system simulation >-- Advanced crop management >-- Confronting problems in modern agriculture. >Do you have any access to STELL II, and is it possible to send me a >copy of that? >Sorry for this too much. > >Mohammad Bannayan >Univ. of Notttingham >Sutton Bonington, Dept. of ENVs >Leics, LE12 5DF >UK >E-Mail: sbxbam@sbn2.nott.ac.uk > > ======================================================== Chris Schroeder AEC/Centrec 3 College Park Court Savoy, IL 61874 Phone (217)352-1190 Fax (217)352-1425 http://www.centrec.com/~centrec/
Date: Fri, 8 Sep 1995 16:31:34 -0400 (EDT) From: Anthony Vcelka 98 <avcelka@nike.heidelberg.edu> Subject: Re: A request Would you please remove my name from your mailing list. Thank you.
Date: Fri, 8 Sep 1995 23:01:30 -0600 From: Daniel Fuka <dan@quetzalcoatl.com> Subject: Re: A request To anyone that is looking at teaching a crop modeling course, I would recommend giving Gaylon Campbell and asking for a copy of his and Claudio Stockles course notes on thier crop modeling course. Included in the course are quite a few labs in which there were simple crop models in basic for which the student manipulated different parameters to understand some of the biophysics behind the models. I guess that Gaylon and Claudio are in the middle of putting together a book out of the notes, but I am sure that he would not mind sending off a copy of the course to interested bystanders if he has some spare time. If he doesn't, Let me know and I will try and organize my handouts and labs into a presentable format. Galon's number is 509-335-1719. I guess that most should know of him in the crop modeling areas. If not, Galon is a Professor at Washington State University. Hope that this is of some help, Let me know if you are not able to get hold of him and I will do my best to throw together the notes. Daniel Fuka Quetzal Computational Associates
End of Digest
>From root@crcnis1.unl.edu Sun Sep 10 09:43 EDT 1995
Date: Sun, 10 Sep 1995 08:30:29 -0500
Message-Id: <199509101330.AA12457@crcnis1.unl.edu>
Subject: AGMODELS-L digest 346

Contents:
Re: Prediction of crop yield (Daniel Fuka <dan@quetzalcoatl.com>)



Date: Sat, 9 Sep 1995 22:20:22 -0600 From: Daniel Fuka <dan@quetzalcoatl.com> Subject: Re: Prediction of crop yield Howdy Karl, I enjoy your questions. Quetzal Computational Associates (the company I am working for) is currently doing quite a bit is spatial predictions of crop yields and crop quality. Currently, we accidently ran into a methodology that quite accurately predicts the state yield and distributes the yield down to the county/subcounty level. Unfortunately the methodology is not based on physiological/phenological models so much at the state level. The physiological/phenological modeling comes into play while distributing the yield throughout the state. It is a fairly neet methodology, and fairly accurate so far, just nothing I would want to publish for fear that the scientific community would laugh me off the podium when I delivered the presentation. As I mentioned, I developed the methodology accidently. I have been working with some commodities/futures people on a project to determine spatial crop quality over the corn belt. I went to look at how they did their crop yield predictions, and I started to laugh when I saw what "magic" numbers they were using. I then had to make some quick appologies once I saw how well the model performed. There only one problem with the model results, this is that it did not predict USDA reports perfectly, which is what they needed. The mass ballence of grain did work out though, whereas the mass ballence completed on the USDA has the amount of food eaten by livestock fluctuating 25% from year to year. I am not sure which numbers to beleive, although the engineer in me is telling me that mass ballence is important, and the scientist in me is telling me that cows eating habits do not fluctuate 25% from year to year. A strange feeling when both the scientist and engineer in me aggree on something. {:-) You asked one question that really makes me think, that is "What do you see as the major bottlenecks to advancing yield prediction in the next 5 or 10 years?" I have been contemplating this for a long time now (years actually) and think that I there is one bit of agricultural modeling that drives me up the wall. That is the fear of computers and of learning to use the right tool for the right job. I will rave on this later. Other quetstions that you asked about, GIS and models, Specific crop modeling, state of the art in yield prediction? I know of many cases in which GIS's are combined with agricultural modeling to make spatial yield predictions. I think that currently the spatial modeling is the state of the art in crop modeling. From here, one just needs to define what scale the predictions are wanted for. I know of many spatial models that work in the 1 to 10 field scale. Quetzal has models that predict yield and crop quality over the entire continental US at a county to subcounty scale. Obviously Quetzal's models can not be as complicated as the field scale models, since there is no possible way of obtaining and fine tuning all of the input parameters necessary for the higher resolution models. Also when you keep the higher complexity while moving to a lower resolution you end up introducing a large amount of error which can only be handelled by taking the model stochastic so that you can interpret the resulting error and the probability distribution of any given results. Quetzal's models are, on the other had, quite a bit more complicated than those that only use satellite derived vegitative indices (VI) to determine crop yield (something that many have tried and all have failed, at least that I know of, I have had many interesting conversations with VI developers about this, and have not met one that thinks that yield forcasting from satellite imagery is possible) but we do have to combine many of the soils and local management trends information into general local parameters. At our spatial scale, the specific crop models become very simular. Most of the work at this scale is in data interpolation and management. The crop models are a shell of phenoological/physiological stages that are triggered by either daylength, thermal time, or regular time, dependant on the crop. For example, oil content of soybeans varies linearly with the ambient temperature durring pod filling. This problems requires 2 triggers (regular time and daylength) as well as a tracking of temperature between the triggers to get an estimate of the soybean oil content. The yield model is a bit more complicated, as it is dependant on biomass production and stresses durring the entire growing season. You may now tune out if you wish, I will be presenting the rave that I had promissed earlier. I have seen some of the most hairy complicated GIS compatible models with nasty numerics and all that are programmed in pascal and can only be run on PC's. Amount of time to run a calculation....weeks to months. (The same amount of time it takes to get a complete knowlege of another language) WHY DO THEY DO THIS!!!! There are multitudes of high power computer resources out there that are just sitting idol. People are begging me to waste time on thier super computers because they want to keep them around and not enough people are using them. All anyone has to do is to learn FORTRAN or C and maybe a few parrallel languages and you can take the week to month computations and pull them down to a few minutes. I am not trying to dog on PASCAL, there are many people out there (and you know who you are,) that will only program in C or Basic or Fortran or even spread sheets. I am not saying that any of these are bad if used propoerly. But if someone has a model in a spread sheet that has gotten so complicated that it takes 20 or 30 minutes to crunch, and they are running hundreds of senarios, don't you think there might be a bit of time saved if a language with better optimization was used, or if a C program with lots of numerics takes to long on a PC, maybe port it to fortran and run it on a workstation??? OK, That is enough SPAM from me, Thanks for listening, I feel much better now, I am interested in all of these topics and would love continuing discussions on them. One thing that I would like to know is what is DowElanco's interest in crop yield predictions. Is there any specific questions that you have? Daniel Fuka Quetzal Computational Associates dan@quetzalcoatl.com
End of Digest
>From root@crcnis1.unl.edu Mon Sep 11 11:25 EDT 1995
Date: Mon, 11 Sep 1995 10:12:06 -0500
Message-Id: <199509111512.AA25539@crcnis1.unl.edu>
Subject: AGMODELS-L digest 347

Contents:
Re: Statistical software (Tim Hess <T.Hess@cranfield.ac.uk>)



Date: Mon, 11 Sep 1995 13:45:46 EDT From: Tim Hess <T.Hess@cranfield.ac.uk> Subject: Re: Statistical software I have been asked by a colleague in Swaziland if I can suggest a good stats package for analysis of agronomic trials. The package should be PC based, preferablly in a Windows environment, and relatively easy to use. They have tried Excel 5, but have run into difficulties with things like split plot designs. I know of Genstat for PC, but would welcome any other useful suggestions. They have a budget so are not too price sensitive. I am leaving for Swaziland on Saturday 16th so I would welcome any useful suggestions before then. Thanks --------------------------------------------------------------------- Tim Hess Department of Water Management Silsoe College Cranfield University Silsoe Tel (0)1525 863292 Bedford, MK45 4DT Fax (0)1525 863000 UK e-mail t.hess@silsoe.cranfield.ac.uk ----------------------------------------------------------------------
End of Digest
>From root@crcnis1.unl.edu Tue Sep 12 11:33 EDT 1995
Date: Tue, 12 Sep 1995 10:12:54 -0500
Message-Id: <199509121512.AA22258@crcnis1.unl.edu>
Subject: AGMODELS-L digest 348

Contents:
 (Anthony Vcelka 98 <avcelka@nike.heidelberg.edu>)
software (<rpolloc@ces.clemson.edu>)
Re: Statistical software (Shu Geng <sgeng@ucdavis.edu>)
Re: Statistical software (Scott Newman <snewman@roll.rock.tap.csiro.au>)
Help for users (hclyma@engecs1.unl.edu (Howard Clyma))
Re: Statistical software (Scott Newman <snewman@roll.rock.tap.csiro.au>)
Response: Prediction of crop yield (griggs@brcsun0.tamu.edu)



Date: Mon, 11 Sep 1995 12:19:24 -0400 (EDT) From: Anthony Vcelka 98 <avcelka@nike.heidelberg.edu> Subject: I need assitance in getting remove from your mailing list. Thank you.
Date: Mon, 11 Sep 1995 13:55:04 -0400 From: <rpolloc@ces.clemson.edu> Subject: software ------------------------------------------------------------------------------- Re: Statistical software (Tim Hess <T.Hess@cranfield.ac.uk>) ---------------------------------------------------------------------- Date: Mon, 11 Sep 1995 13:45:46 EDT From: Tim Hess <T.Hess@cranfield.ac.uk> Subject: Re: Statistical software I have been asked by a colleague in Swaziland if I can suggest a good stats package for analysis of agronomic trials. The package should be PC based, preferablly in a Windows environment, and relatively easy to use. They have tried Excel 5, but have run into difficulties with things like split plot designs. I know of Genstat for PC, but would welcome any other useful suggestions. They have a budget so are not too price sensitive. *********************************************************************** Tom, Look into MatLab. It is mainly an ode and matrix soving platform and a little pricy, but with statistical functions with good visual properties. info@mathworks.com silvia@mathworks.com *********************************************************************** Robert 1939 Fountain Ridge Road Chapel Hill, NC 27514 919/932-6746 **************************************************************** Robert K. Pollock rpolloc@eng.clemson.edu Greenhouse Engineering Research 803/ 656-4078 Agricultural and Biological Engineering lab: 656-4092 204 McAdams Hall, Clemson University fax: 656-0338 Clemson, South Carolina 29634-0357 off: 656-4045 ****************************************************************
Date: Mon, 11 Sep 1995 11:55:39 -0700 (PDT) From: Shu Geng <sgeng@ucdavis.edu> Subject: Re: Statistical software Try MINITAB for PC window. S. Geng
Date: Tue, 12 Sep 1995 09:07:29 +1000 From: Scott Newman <snewman@roll.rock.tap.csiro.au> Subject: Re: Statistical software At 08:47 11/09/95 -0500, you wrote: >I have been asked by a colleague in Swaziland if I can suggest a good >stats package for analysis of agronomic trials. The package should be >PC based, preferablly in a Windows environment, and relatively easy >to use. They have tried Excel 5, but have run into difficulties with things >like split plot designs. I know of Genstat for PC, but would welcome any >other useful suggestions. They have a budget so are not too price sensitive. > >I am leaving for Swaziland on Saturday 16th so I would welcome any useful >suggestions before then. > I am very biased, but the Statistical Analysis System (SAS) is by far the most comprehensive stats package available (on PC as well). That does not mean it is the easiest to use. Scott <><><><><><><><><><><><><><><><><><><> Scott Newman The Cooperative Research Centre for the Cattle and Beef Industry (Meat Quality) CSIRO Division of Tropical Animal Production Box 5545 Rockhampton Mail Centre, Queensland 4702 AUSTRALIA telephone: (079) 36 0137 international: 61 + 79 + 36 0137 facsimile: (079) 36 1034 email: snewman@roll.rock.tap.csiro.au http://www.rock.tap.csiro.au/ When the going gets weird, the weird turn pro -Hunter Thompson <><><><><><><><><><><><><><><><><><><>
Date: Mon, 11 Sep 1995 18:08:47 -0500 (CDT) From: hclyma@engecs1.unl.edu (Howard Clyma) Subject: Help for users Hi, For those of you that want to change your options for the list server or unsubscribe, the attached file is the help file from the unl list server (listserv@unl.edu) To unsubscribe or change any options, you _MUST_ _SEND_ _THE_ _COMMAND_ _TO_ _THAT_ _ADDRESS_!!!!!! If the list name is required the ag models list name is AGMODELS-L!!!! I hope this helps you out. Sincerely, Howard ----------------------------------------------------------- Howard Clyma |Office:(402)472-6340 Graduate Research Assistant |Home:(402)435-3494 Dept. of Biological Systems |Fax::(402)472-6338 Engineering |Internet: 154 L.W. Chase Hall, East Campus |hclyma@engec.unl.edu University of Nebraska-Lincoln |Bitnet: Lincoln, NE 68583-0726 |bsen057@unlvm.unl.edu ----------------------------------------------------------- ----attached help file---- From: listserv@unl.edu To: hclyma@engecs1 Subject: HELP Everything appearing in [] below is optional; everything appearing in <> is mandatory. Recognized requests are: help [topic] -------------- Without arguments, this file. Otherwise get specific information on the selected topic. Topics may also refer to requests. set <list> [<option> <value>] ----------------------------- Without the optional arguments, get a list of all current settings for the specified list. Otherwise change the option to the new value for that list. subscribe <list> <your name> ---------------------------- The only way to subscribe to a list. unsubscribe <list> (or: signoff <list>) --------------------------------------- Remove yourself from the specified list. recipients <list> (or: review <list>) ------------------------------------- Get a list of all people subscribed in the specified list. information <list> ------------------ Get information about the specified list. statistics <list> [subscriber email address(es)] ------------------------------------------------ Get a list of subscribers along with the number of messages each one of them has sent to the specified list. If the optional email addresses are given, then statistics will be collected for these users only. lists ----- Get a list of mailing lists that are served by this server. index [archive | path-to-archive] [/password] --------------------------------------------- Get a list of files in the selected archive, or the master archive if no archive was specified. get <archive | path-to-archive> <file> [/password] [parts] ---------------------------------------------------------- Get the requested file from the specified archive. Certain subparts may be obtained by specifying them as optional arguments. release ------- Get information about the current release of this listserv system. which ----- Get a listing of mailing lists to which you have subscribed. =============================================================================== The requests below are list owner specific: reports <list> <password> ------------------------- Obtain all reports about the specified list. edit <list> <password> <file> ----------------------------- Obtain the specified file for editing. put <list> <password> <keyword> [args] -------------------------------------- Manipulate addresses and change system files. approve <list> <password> <tag> ------------------------------- Approve the message identified by the tag number for posting to the specified moderated list. discard <list> <password> <tag> ------------------------------- Discard the message identified by the tag number sent to the specified moderated list. ===============================================================================
Date: Tue, 12 Sep 1995 09:43:26 +1000 From: Scott Newman <snewman@roll.rock.tap.csiro.au> Subject: Re: Statistical software At 08:47 11/09/95 -0500, you wrote: >I have been asked by a colleague in Swaziland if I can suggest a good >stats package for analysis of agronomic trials. The package should be >PC based, preferablly in a Windows environment, and relatively easy >to use. They have tried Excel 5, but have run into difficulties with things >like split plot designs. I know of Genstat for PC, but would welcome any >other useful suggestions. They have a budget so are not too price sensitive. > >I am leaving for Swaziland on Saturday 16th so I would welcome any useful >suggestions before then. > I am very biased, but the Statistical Analysis System (SAS) is by far the most comprehensive stats package available (on PC as well). That does not mean it is the easiest to use. Scott <><><><><><><><><><><><><><><><><><><> Scott Newman The Cooperative Research Centre for the Cattle and Beef Industry (Meat Quality) CSIRO Division of Tropical Animal Production Box 5545 Rockhampton Mail Centre, Queensland 4702 AUSTRALIA telephone: (079) 36 0137 international: 61 + 79 + 36 0137 facsimile: (079) 36 1034 email: snewman@roll.rock.tap.csiro.au http://www.rock.tap.csiro.au/ When the going gets weird, the weird turn pro -Hunter Thompson <><><><><><><><><><><><><><><><><><><>
Date: Tue, 12 Sep 1995 09:11:30 -0500 From: griggs@brcsun0.tamu.edu Subject: Response: Prediction of crop yield In response to Karl Schnelle at Dow Elanco, Dear Karl, EPIC is the model of choice for crop growth/yields simulation and it handles many crops in rotation, not just mono-cropping. GIS linkages are available but limited. We generally use EPIC along side a watershed model such as SWAT which is built around the GRASS GIS. EPIC is used to model very detailed fields within the larger watershed. Global climate change simulation has already been done several years ago using EPIC. A limited stochastic frontend is also available for EPIC. One of the major limitations to even better yield simulation is the lack of more detailed input data. (1.)We use the Soils-5 database with very little regard to spatial variability or site-specific data and (2.) there is significant variation between plant varieties. Dr. Jim Kiniry with USDA-ARS in Temple, TX is the force behind the EPIC crop growth routines (kiniry@brcsun0.tamu.edu). General info about EPIC (software, documentation and publications list) can be obtained from Georgie Mitchell (mitchell@brcsun0.tamu.edu) Hope this is helpful, Ray H. Griggs Blackland Research Center Texas Agricultural Experiment Staion Temple, TX 76502 (817) 770-6631 >Dear agmodels-l, > >I have seen a few posts to agmodels-l mentioning crop yields (from >Meindert de Jong <TPEJONG@RCL.WAU.NL> in March and from Graham Russell ><GRUSSELL@srv0.bio.ed.ac.uk> in May). At that time I was more involved >in soil carryover and leaching modeling. Now I would like to find >out more about the state-of-the-art in crop yield prediction. >I am researching this for DowElanco as a possible future research >area. I would be interested in any models or systems that deal with >assessing yields. For example, I have recently seen the paper by >A K L Johnson, et al, in Soil Use and Management (1994) that uses an >expert system to take yields and predict economic return. > >Are researchers more involved with building your own yield models for >specific crops, or if not where are you getting your models. There seem >to be many researchers looking at crop specific models to assess the affects >of global climate change or weed stress. Does anyone have plans to hook any >yield models into a GIS (such as Han, et al, 1995) or do Monte Carlo modeling >(Aggarwal, 1995)? > >What do you see as the major bottlenecks to advancing yield prediction >in the next 5 or 10 years? And what might be the outcome of this technology >10 years from now? > >I apologize for asking so many questions, but I would like to learn more >about this area. Your opinions and any information would be greatly >appreciated. > >Perhaps this will stimulate some discussion on the list as opposed to only >SPAM coming across recently :) I'll be happy to summarize and post it >back to the list if anyone would rather email me directly. > >Karl Schnelle, PhD >DowElanco R&D >9330 Zionsville Rd. >Indianapolis, IN 46268 USA >kschnelle@dowelanco.com
End of Digest
>From root@crcnis1.unl.edu Thu Sep 14 09:24 EDT 1995
Date: Thu, 14 Sep 1995 08:03:00 -0500
Message-Id: <199509141303.AA11645@crcnis1.unl.edu>
Subject: AGMODELS-L digest 349

Contents:
CERES CALIBRATION ("T.MAVROMATIS" <T.Mavromatis@uea.ac.uk>)



Date: Thu, 14 Sep 1995 13:13:13 BST From: "T.MAVROMATIS" <T.Mavromatis@uea.ac.uk> Subject: CERES CALIBRATION Hi All, I am a Ph. D student working at the Climatic Research Unit at the University of East Anglia with P. D. Jones. For my thesis I am studying the impacts of climate change on wheat through the use of crop climate models. A major part of my research would be the application of AFRCWHEAT2, EPIC and CERES-Wheat in France. I have some experimental data from some sites in central France and I am working on calibration and validation of CERES to these areas. I have some questions concerning the way I should work: a) should the model's genetic coefficient be calibrated in one site and then applied unchanged to the others or they should be recalibrated for every site ? Please keep in your mind that my plantings date spanning from the early of October to eerly of December and the same cultivar is used for every site the same years.I have been trying to keep all of them constant and change only the phyllochron which varies a lot but it hasn't worked so succesfully. b) Does anyone out there has any information about the wheat cultivar Soissons which is used in france after 1990 ? c) The only informations i have about the soils of my sites is the % silt and their capacity in water (water reserve). For example in one site my soil contains 40 % silt and it is a water reserve of 75mm H2O. Could this soil be a deep one or should my choices be limited to only shallow ones ? Any response would be greatly appreciated. Theodoros Mavromatis
End of Digest
>From root@crcnis1.unl.edu Fri Sep 15 09:31 EDT 1995
Date: Fri, 15 Sep 1995 08:03:52 -0500
Message-Id: <199509151303.AA10072@crcnis1.unl.edu>
Subject: AGMODELS-L digest 350

Contents:
      Re: CERES CALIBRATION (Graham Russell <GRUSSELL@srv0.bio.ed.ac.uk>)
      (Fwd) CERES calibration ("Donald MacKerron" <CEPDKLM@scri.sari.ac.uk>)
Unsubscribe (Anthony Vcelka 98 <avcelka@nike.heidelberg.edu>)
 (Anthony Vcelka 98 <avcelka@nike.heidelberg.edu>)
      'Calibration' of Models ("Donald MacKerron" <CEPDKLM@scri.sari.ac.uk>)
(Fwd) CERES calibration -Reply ("Pete Jamieson" <JamiesonP@crop.cri.nz>)



Date: Thu, 14 Sep 1995 15:07:52 +0000 From: Graham Russell <GRUSSELL@srv0.bio.ed.ac.uk> Subject: Re: CERES CALIBRATION Theodoros Mavromatis asked questions about modelling wheat yield in France. 1. Ideally of course the genetic coefficients should be constants for a cultivar but they often have an environmental component and you may have to recalibrate for each site. 2. You should ask ITCF for information about Soissons which is a well-known wheat cultivar in northern France and which is also grown in south-east England. 3. A soil with 40% silt is almost certainly deep. Have a look at the 1:1000000 soils map of the European Community and its explanatory memoir. Good luck. Dr G. Russell University of Edinburgh Institute of Ecology & Resource Management (Agriculture Building) West Mains Road Edinburgh EH9 3JG SCOTLAND International phone +44 131 535 4063 Fax +44 131 667 2601 UK phone 031 535 4063 Fax 031 667 2601
Date: Thu, 14 Sep 1995 15:12:47 GMT From: "Donald MacKerron" <CEPDKLM@scri.sari.ac.uk> Subject: (Fwd) CERES calibration Forwarded message: From: Self <LAW/CEPDKLM> To: T.Mavromatis@uea.ac.uk Subject: CERES calibration Date: Thu, 14 Sep 1995 15:09:55 Dear Theodoros, Consider what makes the difference between two sites and the difference between two years. Between two years on one site, differences must be largely attributable to the weather. Fine. Between two sites, the differences are attributable to the soil and, if they are some distance apart, the weather. However, for a crop that is vernalized or is sensitive to daylength, there will also be a difference between sites in the daylength on a given date. Now consider what happens when you need to set crop parameters for a given genotype. It should be fair enough to adjust any parameters that are modified by soil fertility and by soil physical properties. it should also be OK to adjust those parameters that reflect the differences in day length on a date. But what happens if you adjust any others? What happens is you make your so-called model unique to both the site and the actual weather with which you calibrated it. Unless that weather recurs (not very likely) your model will be wrong. Just how wrong will depend on the difference in the weather and the sensitivity of the model to those particular parameters. If you include weather effects in your 'calibration' - Not really calibration is it? It is really adjustment to make things fit what you already know. - If you include these then how can you have any reliance on the subsequent output with different weather. The problem is bad enough with current year-to-year variation in weather but if you are considering simulating the consequences of climate change you would be in considerable trouble. So the question boils down to this. If you adjust your parameters by reason and experimental evidence for each value at each site, understanding why a parameter should take a new value, then you may have a chance. If, on the other hand, you adjust your parameters by a statistical fitting procedure to find the values that happen to make your model work on a given site with a given set of weather data then you are wasting your time. - And everyone else's. In the limit, the logical conclusion from this argument is that models should not be 'calibrated'. So-called 'calibration' is a way of coping with incompleteness in the model. Well, it is alright to have a model that is incomplete. That is what models are about - to present a reduction from reality and yet maintain sufficient realism. If your model needs statistical fitting then it is too incomplete. If parameters can only be evaluated by a statistical assessment inside the model of how they affect the output, then all that you are doing is providing a description of your calibration data. I was going to send this message directly to Theodoros, and not 'shout' it into everyone's mailbox but, now that I have argued a position I am more inclined to put it out to everyone to argue over because I think that the points that I have made are pertinent to many crop modellers. I don't expect everyone to agree with me. Not at first. By all means think about this. Best wishes, Donald MacKerron Tel: +44 (0)1383 562731 FAX: +44 (0)1382 562426
Date: Thu, 14 Sep 1995 11:51:34 -0400 (EDT) From: Anthony Vcelka 98 <avcelka@nike.heidelberg.edu> Subject: Unsubscribe UNSUBSCRIBE
Date: Thu, 14 Sep 1995 11:52:37 -0400 (EDT) From: Anthony Vcelka 98 <avcelka@nike.heidelberg.edu> Subject: UNSUBSCRIBE
Date: Thu, 14 Sep 1995 17:22:07 GMT From: "Donald MacKerron" <CEPDKLM@scri.sari.ac.uk> Subject: 'Calibration' of Models Dear Theodoros, I have a feeling that I didn't send this properly last time so I will try once more. Consider what makes the difference between two sites and the difference between two years. Between two years on one site, differences must be largely attributable to the weather. Fine. Between two sites, the differences are attributable to the soil and, if they are some distance apart, the weather. However, for a crop that is vernalized or is sensitive to daylength, there will also be a difference between sites in the daylength on a given date. Now consider what happens when you need to set crop parameters for a given genotype. It should be fair enough to adjust any parameters that are modified by soil fertility and by soil physical properties. it should also be OK to adjust those parameters that reflect the differences in day length on a date. But what happens if you adjust any others? What happens is you make your so-called model unique to both the site and the actual weather with which you calibrated it. Unless that weather recurs (not very likely) your model will be wrong. Just how wrong will depend on the difference in the weather and the sensitivity of the model to those particular parameters. If you include weather effects in your 'calibration' - Not really calibration is it? It is really adjustment to make things fit what you already know. - If you include these then how can you have any reliance on the subsequent output with different weather. The problem is bad enough with current year-to-year variation in weather but if you are considering simulating the consequences of climate change you would be in considerable trouble. So the question boils down to this. If you adjust your parameters by reason and experimental evidence for each value at each site, understanding why a parameter should take a new value, then you may have a chance. If, on the other hand, you adjust your parameters by a statistical fitting procedure to find the values that happen to make your model work on a given site with a given set of weather data then you are wasting your time. - And everyone else's. In the limit, the logical conclusion from this argument is that models should not be 'calibrated'. So-called 'calibration' is a way of coping with incompleteness in the model. Well, it is alright to have a model that is incomplete. That is what models are about - to present a reduction from reality and yet maintain sufficient realism. If your model needs statistical fitting then it is too incomplete. If parameters can only be evaluated by a statistical assessment inside the model of how they affect the output, then all that you are doing is providing a description of your calibration data. I was going to send this message directly to Theodoros, and not 'shout' it into everyone's mailbox but, now that I have argued a position I am more inclined to put it out to everyone to argue over because I think that the points that I have made are pertinent to many crop modellers. I don't expect everyone to agree with me. Not at first. By all means think about this. Best wishes, Donald MacKerron Tel: +44 (0)1383 562731 FAX: +44 (0)1382 562426
Date: Fri, 15 Sep 1995 08:51:00 +1300 From: "Pete Jamieson" <JamiesonP@crop.cri.nz> Subject: (Fwd) CERES calibration -Reply I have to agree with Don MacKerron - if a new site calibration is needed for the model each time it is not useful for much at all, except to show how observations differ from predictions. That may be a useful exercise in itself as a way of testing hypitheses. However, for assessing the effects of change in climate, such an exercise is a waste of time. Your hypothesis when starting is "this model provides a realistic representation of the way a wheat cultivar behaves in response to its environment". You can then explore the consequences of that hypothesis. Testing the hypothesis is what validation is about. CERES, like all wheat models, contains approximations, and some process descriptions that are empirical. The emprical approximations particularly may not survive transfer to very different environments. The overall effects will depend on how vital the process description is to the performance of the model i.e. model sensitivity. Pete Jamieson NZ Institute for Crop & Food Research PB 4704, Christchurch, New Zealand email jamiesonp@crop.cri.nz
End of Digest
>From ab4el@ab4el.com Sat Sep 16 00:01 EDT 1995
Date: Sat, 16 Sep 1995 00:01:00 -0500
Message-Id: <19950916000100.ab4el@ab4el.com>
Subject: AGMODELS-L digest 351 was NOT received

AGMODELS-L digest 351 was NOT received



>From root@crcnis1.unl.edu Mon Sep 18 07:03 EST 1995
Date: Mon, 18 Sep 1995 01:46:05 -0500
Message-Id: <199509180646.AA23831@crcnis1.unl.edu>
Subject: AGMODELS-L digest 352

Contents:
 (teo@atmosphere.fisbat.bo.cnr.it (Teodoro Georgiadis))



Date: Mon, 18 Sep 95 08:20:20 +0200 From: teo@atmosphere.fisbat.bo.cnr.it (Teodoro Georgiadis) Subject: unsuscribe agmodels .............................................................. Teodoro Georgiadis Phone: ++39-51-639-9586 Istituto FISBAT-C.N.R. Fax: ++39-51-639-9652 via Gobetti 101 I-40129 Bologna Italy e-mail: teo@atmosphere.fisbat.bo.cnr.it .............................................................
End of Digest
>From root@crcnis1.unl.edu Tue Sep 19 03:01 EDT 1995
Date: Tue, 19 Sep 1995 01:46:23 -0500
Message-Id: <199509190646.AA15496@crcnis1.unl.edu>
Subject: AGMODELS-L digest 353

Contents:
Journal (Kriengkrai Satapornvanit <odathi@ait.ac.th>)
 ("Federica Rossi / ISTEA C.N.R." <ROSSI@area.bo.cnr.it>)
KBr Physico/Chem Parameters (John_P._Carbone@rohmhaas.com (John P. Carbone))



Date: Mon, 18 Sep 1995 15:03:44 +0700 (GMT) From: Kriengkrai Satapornvanit <odathi@ait.ac.th> Subject: Journal I would like to know if this journal (American Journal of Alternative Agriculture) can be accessed through Internet. I need a specific reference: Dabbert, S. and Madden, P. (1986). The transition to organic agriculture: a multi-year simulation model of a Pennsylvania farm. American Journal of Alternative Agriculture, 1 (3): 99-107. Thanks. Kriengkrai Asian Institute of Technology Thailand
Date: Mon, 18 Sep 1995 18:13:57 +0200 (MET-DST) From: "Federica Rossi / ISTEA C.N.R." <ROSSI@area.bo.cnr.it> Subject: unsbscribe agmodels
Date: Mon, 18 Sep 1995 13:20:35 -0400 From: John_P._Carbone@rohmhaas.com (John P. Carbone) Subject: KBr Physico/Chem Parameters I am interested in calibrating hydrologic parameters in PRZM2 by comparing model estimates with measured field data for KBr. Is there a dissipation half-life for KBr and likewise a Koc. Any other suggestions regarding bromide movement modeling.
End of Digest
>From ab4el@ab4el.com Fri Sep 20 00:01 EDT 1995
Date: Fri, 20 Sep 1995 00:01:00 -0500
Message-Id: <19950920000100.ab4el@ab4el.com>
Subject: AGMODELS-L digest 354 was NOT received

AGMODELS-L digest 354 was NOT received



>From root@crcnis1.unl.edu Thu Sep 21 03:15 EDT 1995
Date: Thu, 21 Sep 1995 01:58:28 -0500
Message-Id: <199509210658.AA05690@crcnis1.unl.edu>
Subject: AGMODELS-L digest 355

Contents:
Modelling text books (Derek Morgan <dm00hp@csl.gov.uk>)
Re: Ag. Financial Mgt. & Software (Jim Meade <jnmeade@blue.weeg.uiowa.edu>)
Re: Modelling text books (Chris Schroeder <rcs@msilink.com>)
Re: Modelling text books (Leonard Coop <coopl@ava.bcc.orst.edu>)



Date: Wed, 20 Sep 1995 11:47:41 +0100 From: Derek Morgan <dm00hp@csl.gov.uk> Subject: Modelling text books I wonder if anybody can help. I have been asked to contribute (lectures, practicals and tutorials) to an MSc course module on pest and disease management. I need to recommend several text books to the students. I shall be concentrating on modelling and forecasting pest and disease development, population thresholds, expert systems, and decision support systems. Can anyone suggest suitable texts ? Additionally I wish to run practicals to teach the principles and development potential applications of modeling/expert systems for pest and disease management. Can anyone suggest suitable computer tools ? I would grateful of any response. Regards. Derek e-mail - d.morgan@csl.gov.uk telephone - (+44) (0)1582 715241 fax - (+44) (0)1582 762178
Date: Wed, 20 Sep 1995 07:13:44 -0500 (CDT) From: Jim Meade <jnmeade@blue.weeg.uiowa.edu> Subject: Re: Ag. Financial Mgt. & Software Joe, I don't know of a list dedicated to ag software, but would like to hear of one if you find it. Jim - Farmer - Iowa City, IA, jnmeade@blue.weeg.uiowa.edu
Date: Wed, 20 Sep 1995 10:46:36 -0500 From: Chris Schroeder <rcs@msilink.com> Subject: Re: Modelling text books There is a good book called Dynamic Modeling by Hannon and Ruth that might help in this area. The ISBN is 0-387-94287-4. Good Luck Chris At 06:20 AM 9/20/95 -0500, you wrote: >I wonder if anybody can help. I have been asked to contribute (lectures, practicals and tutorials) to an MSc course module on pest and disease management. I need to recommend several text books to the students. I shall be concentrating on modelling and forecasting pest and disease development, population thresholds, expert systems, and decision support systems. Can anyone suggest suitable texts ? Additionally I wish to run practicals to teach the principles and development potential applications of modelling/expert systems for pest and disease management. Can anyone suggest suitable computer tools ? > >I would grateful of any response. > >Regards. > > >Derek >e-mail - d.morgan@csl.gov.uk >telephone - (+44) (0)1582 715241 >fax - (+44) (0)1582 762178 > > ======================================================== Chris Schroeder AEC/Centrec 3 College Park Court Savoy, IL 61874 Phone (217)352-1190 Fax (217)352-1425 http://www.prairienet.org/business/centrec/aec_home.htm
Date: Wed, 20 Sep 1995 09:45:17 -0700 (PDT) From: Leonard Coop <coopl@ava.bcc.orst.edu> Subject: Re: Modelling text books > >I wonder if anybody can help. I have been asked to contribute (lectures, > practicals and tutorials) to an MSc course module on pest and disease > management. I need to recommend several text books to the students. I shall > be concentrating on modelling and forecasting pest and disease development, > population thresholds, expert systems, and decision support systems. Can > anyone suggest suitable texts ? Additionally I wish to run practicals to > teach the principles and development potential applications of > modelling/expert systems for pest and disease management. Can anyone suggest > suitable computer tools ? Here are a few I am using right now: Goodenough, J. L., and J. M. Mckinion [eds.]. 1992. i Basics of Insect Modeling. ASAE Monograph Number 10. American Society of Agricultural Engineers. 221 pp. Keen, R. E. and J. D. Spain. 1992. Computer Simulation in Biology. A BASIC Introduction. Wiley-Liss. New York. 498 pp + diskette. Manly, B. F. J. 1990. Stage-Structured Populations. Sampling, analysis and simulation. Chapman and Hall. London. 187 pp. Norton, G. A., and J. D. Mumford [eds.]. 1993. Decision Tools for Pest Management. CAB International. Wallingford, Eng. 279 pp. Len Coop coopl@bcc.orst.edu
End of Digest
>From root@crcnis1.unl.edu Fri Sep 22 03:13 EDT 1995
Date: Fri, 22 Sep 1995 01:58:53 -0500
Message-Id: <199509220658.AA04126@crcnis1.unl.edu>
Subject: AGMODELS-L digest 356

Contents:
Re: Modelling text books (mckinion@marlin.csrumsu.ars.ag.gov (James McKinion))
Ionic Molecules and PRZM2 Estimates of Leaching (John_P._Carbone@rohmhaas.com (John P. Carbone))
 (Anthony Vcelka 98 <avcelka@nike.heidelberg.edu>)
     Re: Ionic Molecules and PRZM2 Estimates of Leaching (DON WAUCHOPE <DON@TIFTON.BITNET>)
Re: Ionic Molecules and PRZM2 Estimates of Leaching (muttiah@brcsun0.tamu.edu (Ranjan Muttiah))
Re: Ionic Molecules and PRZM2 (KSCHNELLE@dowelanco.com)
Re[2]: Ionic Molecules and PRZM2 Estimates of Leaching (John_P._Carbone@rohmhaas.com (John P. Carbone))
Re: Modelling text books (Leonard Coop <coopl@ava.BCC.ORST.EDU>)



Date: Thu, 21 Sep 1995 08:13:30 -0600 From: mckinion@marlin.csrumsu.ars.ag.gov (James McKinion) Subject: Re: Modelling text books >I wonder if anybody can help. I have been asked to contribute (lectures, practicals and tutorials) to an MSc course module on pest and disease management. I need to recommend several text books to the students. I shall be concentrating on modelling and forecasting pest and disease development, population thresholds, expert systems, and decision support systems. Can anyone suggest suitable texts ? Additionally I wish to run practicals to teach the principles and development potential applications of modelling/expert systems for pest and disease management. Can anyone suggest suitable computer tools ? > >I would grateful of any response. > >Regards. > > >Derek >e-mail - d.morgan@csl.gov.uk >telephone - (+44) (0)1582 715241 >fax - (+44) (0)1582 762178 > Derek I was going to recommend the book John Goodenough and I edited for ASAE but I see someone else beat me to the punch. It is good to know the book is being used. As far as models and decision support tools for pest management, you might try: TEXCIM for Windows--Texas Cotton Insect Model Sterling, Dean, Hartstack, Shahed, and Burudgunte Three computer discs plus the users manual may be ordered ($120 outside of Texas) from TAEX Computer Applications (409 845-3929). Our group here has developed the WHIMS ((W)Holistic Insect Management System) cotton insect expert system which has now been released for the Mid South Area of the U.S. Cottonbelt. Documentation is in process of being published (any day now). The system with documentation is availble at no charge for educational purposes. If you are interested in this please contact Dr. Terry Wagner (601 324-4378). This rulebased expert system currently handles 12 Mid South Area pests. It can be run standalone or coupled with the GOSSYM/COMAX cotton crop management system. We are also testing a combined TEXCIM-WHIMS-GOSSYM/COMAX system. James Dr. James M. McKinion Ph. 601-324-4375 USDA-ARS FAX 601-324-4371 Crop Simulation Research Unit Email mckinion@csrumsu.ars.ag.gov P. O. BOX 5367 Mississippi State, MS 39762 USA
Date: Thu, 21 Sep 1995 10:38:50 -0400 From: John_P._Carbone@rohmhaas.com (John P. Carbone) Subject: Ionic Molecules and PRZM2 Estimates of Leaching I am currently attempting to simulate the leaching movement of an ionic molecule (pKa approximately 5) in soils with pH of also approximately 5 with PRZM2. Regardless of the approaches that I take, model predictions while approximating concentrations relatively well predict the movement of the material much earlier than measured results indicate. The questions are: 1. Does PRZM2 handle ionic molecules and if so how? 2. If not, is there a method to correct for the effects of ionization and soil interactions resulting from those interactions.
Date: Thu, 21 Sep 1995 10:48:48 -0400 (EDT) From: Anthony Vcelka 98 <avcelka@nike.heidelberg.edu> Subject: unsubscribe agmodels
Date: Thu, 21 Sep 95 11:14:52 EDT From: DON WAUCHOPE <DON@TIFTON.BITNET> Subject: Re: Ionic Molecules and PRZM2 Estimates of Leaching On Thu, 21 Sep 1995 09:50:23 -0500 John P. Carbone said: >I am currently attempting to simulate the leaching movement of an ionic >molecule (pKa approximately 5) in soils with pH of also approximately 5 with >PRZM2. Regardless of the approaches that I take, model predictions while >approximating concentrations relatively well predict the movement of the >material much earlier than measured results indicate. > >The questions are: > >1. Does PRZM2 handle ionic molecules and if so how? > >2. If not, is there a method to correct for the effects of ionization and > soil interactions resulting from those interactions. John, I believe PRZMII merely asks for a KD or Koc value, right? It doesn't allow for pH effects (and you are right in the middle of the pH range where your compound's mobility would be strongly dependent on pH). I don't know how accurate the basic theory is (see Rev. Environ. Cont. Tox, 123 (1992)) but, approximately, at pH 5 half of your compound is anionic and half is unionized; the anionic part would be like bromide and the other half should have a Koc of approximately 3000/sqrt(solubility at low pH)--probably much larger. Don
Date: Thu, 21 Sep 1995 10:43:36 -0500 From: muttiah@brcsun0.tamu.edu (Ranjan Muttiah) Subject: Re: Ionic Molecules and PRZM2 Estimates of Leaching I'll try to answer your question #1. The code I have may be a little dated (circa. 1990-91). Could you clarify what you mean by correct concentrations, but not modeling the material movement ? SUBROUTINE KDCALC C C computes Kd values for each soil layer by C one of three methods, developed by (1) Karickhoff C (2) Kenaga C (3) Chiou C these models work for non ionic compounds that exhibit C linear adsorption properties C C C + + + PARAMETERS + + + C INCLUDE 'PARM.INC' C C + + + COMMON BLOCKS + + + C INCLUDE 'PEST.INC' INCLUDE 'MISC.INC' C C + + + LOCAL VARIABLES + + + C REAL LOGKOC,KOC,LOGCHK CC DOUBLE PRECISION LOGKOC,KOC,LOGCHK INTEGER*4 I,K CHARACTER*80 MESAGE C C + + + END SPECIFICATIONS + + + C MESAGE = 'KDCALC' CALL SUBIN(MESAGE) C DO 20 K=1,NCHEM DO 10 I=1,NHORIZ IF (PCMC .EQ. 1) THEN C C Karickhoff model (SOL = MOLE FRACTION/LITER) C LOGKOC= (-0.54 * LOGCHK(SOL))+ 0.44 ELSEIF (PCMC .EQ. 2) THEN C C Kenaga model (SOL = MILLIGRAMS/LITER) C LOGKOC= 3.64- (0.55*LOGCHK(SOL)) ELSE C C Chiou model (SOL = MICROMOLES/LITER) C LOGKOC= 4.04- (0.557*LOGCHK(SOL)) ENDIF KOC = 10.**LOGKOC KD(K,I) = KOC * (OC(I)/100.) 10 CONTINUE 20 CONTINUE
Date: Thu, 21 Sep 1995 11:21:40 -0500 (EST) From: KSCHNELLE@dowelanco.com Subject: Re: Ionic Molecules and PRZM2 muttiah@brcsun0.tamu.edu (Ranjan Muttiah) posted the old PRZM2 code for calculating Kd. The newest version, PRZM-2 Release 2.0, still contains the same code. Karl Schnelle DowElanco kschnelle@dowelanco.com
Date: Thu, 21 Sep 1995 12:40:35 -0400 From: John_P._Carbone@rohmhaas.com (John P. Carbone) Subject: Re[2]: Ionic Molecules and PRZM2 Estimates of Leaching Don and All, That brings me to a second question re: Bromide. In water one would imagine that it to is anionic, does this charge capacity then effect the movement of that material. I have looked at bromide movement with PRZM2 and compared it to measured data...the bromide front is way ahead of the measured data but consistent with, I think, an application rate of 50 lbs/A sandy soil, rainfall events AND irrigation in very close proximity to the application date, virtually no dissipation and a kd set to very small numbers. As per my earlier question on the net are there nuances re bromide PRZM2 modeling that I need to be aware of.
Date: Thu, 21 Sep 1995 17:44:11 -0700 (PDT) From: Leonard Coop <coopl@ava.BCC.ORST.EDU> Subject: Re: Modelling text books Yet another one of interest is: Gutierrez, A. P. 1995. Applied Population Ecology: a supply-demand approach. Wiley 305 pp. This may not be officially released yet, but it looks like it will be one to watch for. Len Coop coopl@bcc.orst.edu
End of Digest
>From root@crcnis1.unl.edu Sat Sep 23 03:11 EDT 1995
Date: Sat, 23 Sep 1995 01:59:33 -0500
Message-Id: <199509230659.AA28331@crcnis1.unl.edu>
Subject: AGMODELS-L digest 357

Contents:
unsubscribe (Josh M Jance <jmj@gas.uug.arizona.edu>)
Farmland Engineering??? (Ching-Pin Tung <cptung@hy.ntu.edu.tw>)



Date: Fri, 22 Sep 1995 12:21:07 -0700 (MST) From: Josh M Jance <jmj@gas.uug.arizona.edu> Subject: unsubscribe unsubscribe
Date: Sat, 23 Sep 1995 11:44:34 +0800 (CST) From: Ching-Pin Tung <cptung@hy.ntu.edu.tw> Subject: Farmland Engineering??? If this is not a proper post here, please accept my appology. I am going to design a course about farmland engineering. If you have any idea about what I should include in this course, please let me know. BTW, Is there any good textbook about farmland engineering? Thanks in advance!!! Tung
End of Digest
>From root@crcnis1.unl.edu Sun Sep 24 03:12 EDT 1995
Date: Sun, 24 Sep 1995 01:59:47 -0500
Message-Id: <199509240659.AA07393@crcnis1.unl.edu>
Subject: AGMODELS-L digest 358

Contents:
 (Anthony Vcelka 98 <avcelka@nike.heidelberg.edu>)



Date: Sat, 23 Sep 1995 12:08:45 -0400 (EDT) From: Anthony Vcelka 98 <avcelka@nike.heidelberg.edu> Subject: unsubscribe agmodels
End of Digest
>From root@crcnis1.unl.edu Mon Sep 25 03:14 EDT 1995
Date: Mon, 25 Sep 1995 02:00:44 -0500
Message-Id: <199509250700.AA16844@crcnis1.unl.edu>
Subject: AGMODELS-L digest 359

Contents:
 (andrews@apsrusg.sth.dpi.qld.gov.au (Andy Smith))
Re: Modelling text books (CGStockton@aol.com)



Date: Sun, 24 Sep 1995 11:43:56 GMT From: andrews@apsrusg.sth.dpi.qld.gov.au (Andy Smith) Subject: G'day, I'm an Ag Engineer, currently enrolled in a M.AppSci at the University of Queensland - Gatton College. However I work with APSRU (Agricultural Production Systems Research Unit) which is a joint group of QDPI and CSIRO based in Toowoomba. (Queensland Dept of Primary Industries & Commonwealth Scientific and Industrial Research Organization) Currently looking at effects of soil erosion on changes in soil water and nitrogen in native pasture grazing systems in Qld. I'm working within the APSIM (Agricultural Production SIMulator) framework. Also looking at GRASP (GRASs Production) model. For Eng proj looked at the ASTC (Australin Soil Temperature - Cereals) model. Would like to hear from people who have used or are using this model re accuracy, reliability, improvements, calibrations... May be looking at it again for improving soil N modelling. Yours Andy ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Andy Smith Agricultural Production Systems Research Unit (076) 314 421 (w) 203 Tor Street (076) 332 678 (fax) P.O. Box 102, Toowoomba, QLD 4350 andrews@apsrusg.sth.dpi.qld.gov.au ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Date: Sun, 24 Sep 1995 16:06:04 -0400 From: CGStockton@aol.com Subject: Re: Modelling text books I'd suggest you contact the Society for Computer Simulation in San Diego, California or more specifically, John McLeod at mcleod@sdsc.edu for further insights and ideas. Cordially, Chip Stockton
End of Digest
>From root@crcnis1.unl.edu Tue Sep 26 03:16 EDT 1995
Date: Tue, 26 Sep 1995 02:01:10 -0500
Message-Id: <199509260701.AA09681@crcnis1.unl.edu>
Subject: AGMODELS-L digest 360

Contents:
      Re: Farmland Engineering??? ("Gregory McIsaac" <GFM@age2.age.uiuc.edu>)
unsubscribe (Josh M Jance <jmj@gas.uug.arizona.edu>)
 (emmanuel.meekers@fundp.ac.be (Emmanuel MEEKERS))



Date: Mon, 25 Sep 1995 09:06:24 CST From: "Gregory McIsaac" <GFM@age2.age.uiuc.edu> Subject: Re: Farmland Engineering??? What do you mean by Farland Engineering? Would it be equivalent to Soil and Water Conservation Engineering (or would that be a part of it. If so, then the book "Soil and Water Conservation Engineering" by Glen Schwab et al. (1993, Fourth Edition) is what is commonly used in the US. Best Regards, Greg McIsaac University of Illinois > Date: Fri, 22 Sep 1995 22:38:17 -0500 > Reply-to: <agmodels-l@unl.edu> > From: Ching-Pin Tung <cptung@hy.ntu.edu.tw> > To: Multiple recipients of list <agmodels-l@unl.edu> > Subject: Farmland Engineering??? > If this is not a proper post here, please accept my appology. > > I am going to design a course about farmland engineering. If you have any idea > about what I should include in this course, please let me know. BTW, Is there > any good textbook about farmland engineering? > > Thanks in advance!!! > > Tung >
Date: Mon, 25 Sep 1995 09:31:46 -0700 (MST) From: Josh M Jance <jmj@gas.uug.arizona.edu> Subject: unsubscribe unsubscribe
Date: Mon, 25 Sep 1995 18:10:15 +0100 From: emmanuel.meekers@fundp.ac.be (Emmanuel MEEKERS) Subject: Hi, I'm working at the University of Namur (Belgium) - Faculty of Economic and Social Sciences. We are interested in the european agriculture and the development of biomass (Sweet and Fiber Sorghum, Miscanthus, Short Rotation Foretry, ...). We are looking into which conditions biomass can be promote, for the farmer and for the industry. ______________________________________________________________________________ Emmanuel MEEKERS Tel. +32-81-72.48.10 CREW-FUNDP Fax. +32-81-72.48.40 Rempart de la Vierge, 8 5000 NAMUR email : emmanuel.meekers@fundp.ac.be BELGIUM
End of Digest
>From root@crcnis1.unl.edu Wed Sep 27 03:20 EDT 1995
Date: Wed, 27 Sep 1995 02:01:32 -0500
Message-Id: <199509270701.AA00861@crcnis1.unl.edu>
Subject: AGMODELS-L digest 361

Contents:
RE: Ag. Financial Mgt. & Software (RILCONT1@area.bo.cnr.it)
RE: Ag. Financial Mgt. & Software (xgrover@vt.edu (Gordon E. Groover))
RE: Ag. Financial Mgt. & Software (Chris Butts <cbutts@asrr.arsusda.gov>)



Date: Tue, 26 Sep 1995 16:57:37 +0100 (MET) From: RILCONT1@area.bo.cnr.it Subject: RE: Ag. Financial Mgt. & Software I subscribed agmodels-l some time ago and there is not much about management and financial aspect, though I think there are a few people here interested in such issues. I am one of them and if there are more specific lists I would be interested as well. If there are not, why not discuss this things here? Ciao a tutti Davide
Date: Tue, 26 Sep 1995 15:56:14 -0400 From: xgrover@vt.edu (Gordon E. Groover) Subject: RE: Ag. Financial Mgt. & Software The questions has been asked a few times about a ListServ for discussing Ag Financial Management issues or Agricultural Software (financial or production). As list is now in place at VA Tech with that purpose. The list is being established as a follow-up forum for the, September 28, 1995, satellite video conference Teaching "Hands on" Computer Workshops: Farm Financial Recordkeeping. The list is new so we encourage you to participate even if you do not view the conference. The purpose of the farm-records listserv is to provide a forum for questions, answers, and discussion of all aspects of using and teaching farm financial and production records. Please, view this forum as a place to interact with your fellow educators and participants in the AG*SAT conference to improve our knowledge of farm-level records and their use in day-to-day management. To subscribe to the farm-records listserv send e-mail to: listserv@listserv.vt.edu In the body of the e-mail message, type: subscribe farm-records Your_Name where "Your_Name" is your name, not computer id. The Listserv at Va Tech will respond with a message to your computer ID requesting confirmation that you want to be added to the list. After confirming this request you will be added to the list and can begin sending and receiving messages. If you have questions about the Farm-Records Listserv please contact: Gordon Groover at xgrover@vt.edu. Gordon E. Groover Extension Economist Farm Management Department Agriculture and Applied Economics Va. Tech Blacksburg, Va. 24061-0401 Phone: 540-231-5850 Fax: 540-231-7417 INTERNET: xgrover@vt.edu
Date: Tue, 26 Sep 1995 16:41:10 -0400 (EDT) From: Chris Butts <cbutts@asrr.arsusda.gov> Subject: RE: Ag. Financial Mgt. & Software Gordon: Is the video conference being broadcast via satelite? If so what is the time, date and satelite coordinates, etc. Is there a charge for the conference (worksohop)? Marshall Lamb is an ag economist with Auburn University working at the National Peanut Research Lab (USDA, ARS) and is developing yield, quality, price prediction models. He is also deveoping a long-term whaole farm planning model. It is called PNUTPLN. I'm trying to get himn hooked up on the internet and using email, and listserv discussion groups. We would be interested in further discussions. ******************************************************************** * Chris Butts * cbutts@asrr.arsusda.gov * * USDA, ARS ***************************** * National Peanut Research Laboratory * Phone: 912-995-7431 * * 1011 Forrester Dr., SE ***************************** * Dawson, Georgia 31742 * FAX: 912-995-7416 * ********************************************************************
End of Digest
>From root@crcnis1.unl.edu Thu Sep 28 03:15 EDT 1995
Date: Thu, 28 Sep 1995 02:02:09 -0500
Message-Id: <199509280702.AA17996@crcnis1.unl.edu>
Subject: AGMODELS-L digest 362

Contents:
      Introduction ("E. John Sadler" <sadler@sunbrn.florence.ars.usda.gov>)
      Introduction ("E. John Sadler" <sadler@sunbrn.florence.ars.usda.gov>)
unsubscribe (Josh M Jance <jmj@gas.uug.arizona.edu>)



Date: Wed, 27 Sep 1995 12:18:32 +0000 From: "E. John Sadler" <sadler@sunbrn.florence.ars.usda.gov> Subject: Introduction Greetings, As the 573rd member of this group, I am somewhat intimidated by the thought that this will be so widespread. Our Internet connection was just upgraded, so participation in such things as discussion groups and home page web sites is now practical. My interest is models that are especially amenable to, or have been used for, site-specific farming. Graham Russell, another agmodels-l subscriber, and I are presenting a discussion on such uses at the St. Louis ASA meetings and have been accumulating citations all summer. This group may be able to supplement the other methods of acquisition. We are aware of the several uses of the IBSNAT models within GIS systems, via communication with, primarily, Gerritt Hoogenboom. We welcome citations on any other uses, or uses of DSSAT/IBSNAT models that may not be known to Gerritt. Thanks. ============================================================== E. John Sadler USDA-ARS sadler@florence.ars.usda.gov Coastal Plains Soil, Water, and Plant Resarch Center 803-669-5203x112 (voice) 2611 West Lucas St. 803-669-6970 (fax) Florence, SC 29501-1241 ==============================================================
Date: Wed, 27 Sep 1995 12:18:32 +0000 From: "E. John Sadler" <sadler@sunbrn.florence.ars.usda.gov> Subject: Introduction Greetings, As the 573rd member of this group, I am somewhat intimidated by the thought that this will be so widespread. Our Internet connection was just upgraded, so participation in such things as discussion groups and home page web sites is now practical. My interest is models that are especially amenable to, or have been used for, site-specific farming. Graham Russell, another agmodels-l subscriber, and I are presenting a discussion on such uses at the St. Louis ASA meetings and have been accumulating citations all summer. This group may be able to supplement the other methods of acquisition. We are aware of the several uses of the IBSNAT models within GIS systems, via communication with, primarily, Gerritt Hoogenboom. We welcome citations on any other uses, or uses of DSSAT/IBSNAT models that may not be known to Gerritt. Thanks. ============================================================== E. John Sadler USDA-ARS sadler@florence.ars.usda.gov Coastal Plains Soil, Water, and Plant Resarch Center 803-669-5203x112 (voice) 2611 West Lucas St. 803-669-6970 (fax) Florence, SC 29501-1241 ==============================================================
Date: Wed, 27 Sep 1995 09:20:13 -0700 (MST) From: Josh M Jance <jmj@gas.uug.arizona.edu> Subject: unsubscribe unsubscribe
End of Digest
>From root@crcnis1.unl.edu Fri Sep 29 03:18 EDT 1995
Date: Fri, 29 Sep 1995 02:02:35 -0500
Message-Id: <199509290702.AB14966@crcnis1.unl.edu>
Subject: AGMODELS-L digest 363

Contents:
Sub: Meteorology /Crop yield / GIS ("Debabrata Midya" <d.midya@uws.EDU.AU>)
Plug in biological control model (Twittman@aol.com)



Date: Fri, 29 Sep 95 12:43:50 EST From: "Debabrata Midya" <d.midya@uws.EDU.AU> Subject: Sub: Meteorology /Crop yield / GIS I am Deb. I am doing PhD in "Spatial Decision Support System" - which integrates Artificial Neural Network Approach or Autoregressive Intergrated Moving average (ARIMA) and Geographic Information System (GIS). My areas of interests are: 1. Predicting seasonal climatic outlook using - Artificial Neural Network Approach (ANN) - Autoregressive Integrated Moving Average approach (ARIMA) 2. Modelling climate variability and crop yield 3. Spatial Interpolation using GIS Anybody can help me. Thanking you, Deb
Date: Thu, 28 Sep 1995 23:51:42 -0400 From: Twittman@aol.com Subject: Plug in biological control model Dear Agmodelers, I am an organic farmer working with a software person not familiar with insect modeling programs. We are trying to add a segment to an organic farming software program that will work as a "plug in" model. Is this possible or are the variables and fields so different that each insect group must have its own model? Are there a few standard models used for predicting and monitoring insect pest and predator populations? What are the basic parameters used in these models? I hope these questions are not to elementary for your group. I feel at a disadvantage as I have been following the agmodels dialog for months and often do not grasp what is going on. However, as a farmer I am savey as to the variables use on local farms for release of benificials (mostly degree days, pest populations and general time of year). But I know there are probably many more. Is there a reference that is comprehensive or can you give me a basic framework? Thanks, Thomas Wittman, Molino Creek Farming Collective
End of Digest
>From ab4el@ab4el.com Sat Sep 30 00:01 EST 1995
Date: Sat, 30 Sep 1995 00:01:00 -0500
Message-Id: <19950930000100.ab4el@ab4el.com>
Subject: AGMODELS-L digest 364 was NOT received

AGMODELS-L digest 364 was NOT received



AGROMOMY Homepage @ SunSITE


Prepared by Steve Modena, AB4EL
Suggestions and comments to: modena@SunSITE.unc.edu