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Re: [SANET-MG] CO2 Extraction - Soil Testing



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



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