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Coldwater, Michigan | Unless you are raising specialty crops, Purdue would come in about right on the No more "P" beyond 25ppm, or 50#/acre mark when using the Bray p1 extractant. Olsen or BiCarb method is meant for soils with high Ph (over 7). Usually the numbers are lower than a Bray P1 extract would produce, and therefore has it's own interpretation of where those numbers should be.
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soil test
