McNay Memorial Research and Demonstration Farm

Corn Grain Yield and Leaf Potassium Concentration as Affected by Sidedressed Liquid Potassium Fertilizer in South Central Iowa

Authors: Antonio Mallarino (Iowa State University) , Louis Thompson (Iowa State University) , Gary Thompson (Iowa State University) , Nicholas Piekema (Iowa State University)

  • Corn Grain Yield and Leaf Potassium Concentration as Affected by Sidedressed Liquid Potassium Fertilizer in South Central Iowa

    McNay Memorial Research and Demonstration Farm

    Corn Grain Yield and Leaf Potassium Concentration as Affected by Sidedressed Liquid Potassium Fertilizer in South Central Iowa

    Authors: , , ,

Abstract

Iowa State University (ISU) extensive past and ongoing research at several research farms and farmer’s fields has been investigating the corn and soybean yield response to preplant potassium (K) fertilizer placement methods or to starter K. Largely due to low grain prices, many farmers and crop consultants are asking whether post-emergence K sidedress could be of value to increase corn yield and perhaps reduce the needed K application rate. Postemergence N sidedress for corn is used by many Iowa farmers, and its effectiveness compared with preplant N application has been compared in numerous trials. However, no ISU study has evaluated sidedress K application. Therefore, the objectives of a study at this research and demonstration farm and similar studies at four other farms was to evaluate how sidedressed liquid K fertilizer affects corn yield and K tissue concentrations when different rates of fertilizer are applied. This report summarizes the results of trials conducted at this research farm.

How to Cite:

Mallarino, A. & Thompson, L. & Thompson, G. & Piekema, N., (2019) “Corn Grain Yield and Leaf Potassium Concentration as Affected by Sidedressed Liquid Potassium Fertilizer in South Central Iowa”, Iowa State University Research and Demonstration Farms Progress Reports 2018(1).

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Published on
26 Apr 2019