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I was thinking today about soil PH
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jwitter
Posted 11/15/2012 22:46 (#2699668 - in reply to #2699544)
Subject: RE: I was thinking today about soil PH


Davenport, IA
Mg affects pH by 1.4 to 1.6 times more than Ca, pound for pound. Looking at your base saturation tests for Ca and Mg, Ca should be 60 to 70% and Mg 10 to 20%. Lighter soils need more Mg to bind the soil.
Your %Ca + %Mg should equal somewhere around 80%. If it is higher changes are your Mg is in excess. When these %'s are correct your pH will also be in line. These ranges depend on the lab being used.

Sulfer will tie up and remove whatever cation is in excess, Mg or Ca. Gypsum is commonly used when Ca is needed and Mg is in excess. Gypsoil has plants near Evansville, IN and should be available in your area.
If Ca is in excess then a acid is needed to break down the Ca. All excess nitrogen sources will do this but AMS also contains sulfer.
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