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

A consultant friend of mine used a CO2 / humic acid extractant that he developed. The thought was to get a more accurate read relevant to biological methods of producing crops. Testing calcareous soils common in the SW US seem to require a different approach although this sort of method may be relevant for other soils. The important question is -- Do the numbers you generate relate to the response you see in the field? If they don't, it doesn't have much value.
Another tack is to do bio-assays such as culturing azotobacter or pot tests. Of course, this does not generate the crisp and exact numbers that has become the norm for assessing soil.

John Cowan
Verde Valley Agri-Lab

-----Original Message-----
From: Sustainable Agriculture Network Discussion Group [mailto:SANET-MG@LISTS.IFAS.UFL.EDU]On Behalf Of Steve Bridges
Sent: Saturday, October 09, 2004 4:22 PM
Subject: [SANET-MG] CO2 Extraction - Soil Testing

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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