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This article in AJ

  1. Vol. 60 No. 5, p. 524-529
     
    Received: Mar 18, 1968
    Published: Sept, 1968


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doi:10.2134/agronj1968.00021962006000050024x

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

  1. Dale Colyer and
  2. Earl M. Kroth2

Abstract

Abstract

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.

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