Re: [compost_tea] low phosphate?

From: <soilfoodweb_at_aol.com>
Date: Fri, 17 Sep 2004 20:08:29 EDT

the "total P" on the last phosphate e-mail isn't the TOTAL P - it's just the
exchangeable, most likely. You have to know, and say, what test was used to
determine the values. There are probably 150 different extraction methods for
assessing "total P" in soil, and none of them truly give you total P. The 150
tests give soluble, or exchanageable P, not truly total P.

Elaine R. Ingham
Soil Foodweb Inc., Corvallis, Oregon
Soil Foodweb Inc., Port Jefferson, New York
Soil Foodweb Institute, Lismore Australia
Soil Foodweb Institute Cambridge, New Zealand
Soil Foodweb Inc., Hilversum, The Netherlands
Laboratorios de Soil Foodweb, Culiacan, Mexico
Soil Foodweb Inc., Jerome, Idaho




Received on Fri Sep 17 2004 - 21:00:09 EDT

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