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Old 09-02-2003, 01:39 AM
Dchall_San_Antonio Dchall_San_Antonio is offline
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Join Date: Aug 2003
Location: San Antonio, Texas
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for the NPK of different materials.

Once you start using organic fertilizers, you might see a shift of soil pH toward neutral. This happens from both directions, acid and alkaline. The reason is that humic acids are tremendous buffers and they buffer right at pH of 7.0. As you build up your soil microbial numbers and their health, they will be spewing forth with humic acids to feed plants and neutralize the soil. Still, sometimes lime helps. A soil test should tell you.

There is one soil test lab I am aware of that is very organic oriented. It is the Texas Plant and Soil Lab. Read about them at

I would like to develop a list of organic oriented test labs, so please contribute when you find one.
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