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Nutrient Content of Corn as Related to Fertilizer Application and Soil Fertility¹

Synopsis: Foliar analyses of corn leaves were made in conjunction with Kansas fertilizer experiments. A close relationship was found between content of exchangeable K in soil and leaf content of K. Definite establishment of minimum P content was not possible. Minimum N content for maximum yield varied with time of sampling, ranging from as much as 3.0% when corn was 3 feet high to only 1.9% at early ear stage. Addition of K to soils low in exchangeable K caused decreases in Mg content of leaves. Calcium content did not change markedly as a result of fertilizer application.

² Formerly graduate assistants, and Professor of Soils, respectively.

Received for publication April 26, 1956.