Hello folks, A quick lit search of the National Ag library database (AGRICOLA) turned up only one article by A D Lengyel in the last 20 years. AU: Lengyel,-A.D. TI: The use of soil and plant analysis in maximizing growth, production and freeze resistance of jojoba. SO: Proceedings : Seventh International Conference on Jojoba and Its Uses / edited by A.R. Baldwin. Champaign, Ill. : American Oil Chemists' Society, 1988. p. 112-116. This proceedings does not appear to be in the NCSU library system. ********************** If the CO2 extraction methodology used by the Texas Plant and Soil lab is performed routinely, it surely is a rapid extraction process like other routine soil test methodologies *and* very different than the slow processes by which nutrients are acquired over a growing season by crop roots. The important question is whether the quantity of nutrients obtained using CO2 extraction is consistently predictive of crop response to nutrient management. Extensive field testing (a range of crops and soils) is required to determine the predictive value of extraction techniques. It is unusual for private labs to be able to afford extensive field testing. As a result private labs normally use extraction/interpretation methodologies that have been field tested by public labs *or* they use methodologies that have not been rigorously tested (from a research perspective). Is any one familiar with the history of the Morgan extractant ? Joel Joel Gruver Dept of Soil Science NC State University jgruv@hotmail.com
From: Steve Diver <steved@NCAT.ORG> Reply-To: Sustainable Agriculture Network Discussion Group <SANET-MG@LISTS.IFAS.UFL.EDU> To: SANET-MG@LISTS.IFAS.UFL.EDU Subject: Re: [SANET-MG] CO2 Extraction - Soil Testing Date: Sat, 9 Oct 2004 20:40:56 -0500 Hi Steve B., My exposure leads to the same sources. It originated in Arizona and the commercial lab that employs this method is TPSL. K. Chandler himself would be a good source, which you know from first-hand experience. A trip to an agricultural library might turn up something. There are a number of soil analysis manuals and handbooks, some older and some newer. What is helpful to know is that K. Chandler says that CO2 extraction mimics nutrient availability to plant roots, which is the same thing the lab advisors who were students of Carey Reams say about the Morgan Extract. Steve Diver Steve Bridges wrote:Can anyone provide me with a description, or leads for more information, on the CO2 Extraction Method of soil testing? And how it compares with other extraction methods? This type of soil testing originated under Dr. Albin D. Lengyel, at the University of Arizona during the 1970's. The only lab that I know of that uses this type of soil extraction is the Texas Plant and Soil Lab. I've searched the web and come up empty handed. Any help would be appreciated. Steve Bridges******************************************************** To unsubscribe from SANET-MG: 1- Visit http://lists.sare.org/archives/sanet-mg.html to unsubscribe or; 2- Send a message to <listserv@sare.org> from the address subscribed to the list. Type "unsubscribe sanet-mg" in the body of the message. Visit the SANET-MG archives at: http://lists.sare.org/archives/sanet-mg.html For more information on grants and other resources available through the SARE program, please visit http://www.sare.org.
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