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Influence of Precipitation, Soil Water, and Plant Population Interactions on Corn Grain Yields¹

Corn grain yield response to different levels of soil water, precipitation, and plant population during the rapid growth period of corn was evaluated by multiple regression using 4 years' field data. For 17 locations showing a yield response to stand, multiple regression accounted for 91% of the variation in grain yields during the 4-year period. Estimated corn yields from the developed equation varied from 0 to 8976 kg/ha for all possible combinations of the independent factors.

The corn growth interval from 30-cm plant height to silking was divided into two equal time periods. Precipitation received during the second period (late July and early August) exerted a greater influence on corn yields than did that received during the first period (early July). With increased precipitation during the two periods, the optimum part of the stand—yield curve shifted to correspondingly higher stands.

Key Words: rainfall distribution • rapid growth stage • rainfall probability

² Research Soil Scientists, USDA, North Central Soil Conservation Research Center, Morris, Minnesota 56267.

Received for publication January 6, 1968.

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