High-producing cornfields in Minnesota are generally
on soils built up to a high degree of fertility. This buildup
is primarily from liberal broadcast applications of
phosphorus (P) and potassium (K) fertilizers.
Overdahl, C.J.; Fenster, W.E.; Randall, G.W..
Phosphorus and Potassium Experiments on Well-Managed Soils in South-Central Minnesota.
Minnesota Agricultural Experiment Station.
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