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Ohio long-term P and K fertilizer trials

Ohio corn, soybean and wheat check-off dollars are currently funding Ohio State Extension research to update the "Tri-State Fertilizer Recommendations for Corn, Soybeans, Wheat and Alfalfa."


Phosphorus fertilizer sources

Questions are sometimes asked about the effectiveness, composition, and plant availability of various phosphorus (P) fertilizer sources. Questions such as, “Is liquid more available to the
crop than dry P fertilizer? Is one source better than another in alkaline soils? Can the optimum P rate be reduced with certain sources?” are not uncommon. A simple review of the fundamentals of P fertilizer sources can help address such questions.


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