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

From: Steve Diver <[email-masked]>
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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---

From: John Cowan <[email-masked]>
Date: Sun, 10 Oct 2004 09:57:58 -0700

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:[email-masked]]On Behalf Of Steve Bridges
  Sent: Saturday, October 09, 2004 4:22 PM
  To: [email-masked]
  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.