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Corn Yield and Economic Optima for Nitrogen Treatments and Plant Population Over a Seven-Year Period¹

Response of corn (Lea Mays L.) yield to nitrogen applications at various planting rates were determined for two soil types over a seven-year period. Regression analysis was used to determine response surfaces, maximum and economic optimal treatments and yields. Response curves and production surfaces were constructed from the regression data. Significant differences in responses and optimal treatments were found from year to year and between sites. Optimal nitrogen treatments varied from 21.4 to 202.1 kg/ha and optimal planting rates from 12,189 to 54,135 plants/ha. A function from data aggregated over seven years indicated that the optimal rates would be 120 kg/ha of N and 37,787 plants/ha.

Key Words: Zea mays L. • nitrogen fertilization • plant population • economic optima • yield response

² Associate Professor of Agricultural Economics and Assistant Professor of Soils, University of Missouri, Columbia, Mo. 05201.

Received for publication March 18, 1968.

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				M. M. Al-Kaisi and X. Yin Effects of Nitrogen Rate, Irrigation Rate, and Plant Population on Corn Yield and Water Use Efficiency Agron. J., November 1, 2003; 95(6): 1475 - 1482. [Abstract] [Full Text] [PDF]