Project ID

1991-45

Abstract

Profitable corn production requires adequate amounts of plant-available phosphorus (P) and potassium (K) in the soil. Deficiencies of these nutrients are not a problem in many Iowa soils. In fact, recent soil-test summaries and surveys show that fertilization practices have increased initially low values of P and K in most soils to levels higher than needed to maximize yields. Additional studies indicate that applying P or K fertilizers to corn and soybeans grown on soils testing high in these nutrients is not profitable, Consequently, evaluating excess P and K is now more important than evaluating P and K deficiencies.

Principal Investigator(s)

Alfred M. Blackmer

Co-Investigator(s)

Antonio P. Mallarino

Year of Grant Completion

1993

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