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This article in AJ

  1. Vol. 62 No. 5, p. 669-672
    Received: Feb 27, 1970



Effects of Weather, Nitrogen and Population on Corn Yield Response1

  1. Bruno Bondavalli,
  2. Dale Colyer and
  3. Earl M. Kroth2



The effects of rainfall and temperature on the yield and response of corn (Zea Mays L.) to plant population and nitrogen application rates were estimated from experimental data collected at three Missouri sites over an 8-year period. The growing season from May through August was divided into 15-day periods to test for the effect of rainfall and temperature on corn response to several nitrogen and planting rates. Preseason rainfall and total rainfall during the growing season also were included as variables. Both temperature and rainfall variables affected yield significantly with the first half of August being most significant with respect to rainfall and the second half of May with respect to temperature. The economic optimum inputs at the mean rainfall for the growing season were 511,850 plants/ha and 163 kg N/ha. The optimal input of nitrogen was relatively sensitive to the rainfall level with the optimal population level less affected.

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