Northern Research and Demonstration Farm

Continuous Corn Response to Nitrogen and Potassium in Northern Iowa

Authors: Antonio Mallarino (Iowa State University) , Jackson Hirniak (Iowa State University) , Ryan R. Oltmans (Iowa State University) , Matthew Schnabel (Iowa State University)

Abstract

A long-term experiment was established in 2013 at the Northern Research and Demonstration Farm to study the responses to nitrogen (N) and potassium (K) on continuous corn. Results of a previous long-term study with continuous corn conducted at this farm from 1963 through 2001with different N, phosphorus (P), and K fertilization rates showed a positive interaction between N and K, but not between N and P, or P and K. A deficiency of either N or K reduced the maximum yield level and also limited the yield response to increasing rates of the other nutrient. The study summarized in this report was established to further assess possible N by K interactions.

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How to Cite: Mallarino, A. , Hirniak, J. , Oltmans, R. R. & Schnabel, M. (2017) “Continuous Corn Response to Nitrogen and Potassium in Northern Iowa”, Iowa State University Research and Demonstration Farms Progress Reports. 2016(1).