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This article in AJ

  1. Vol. 63 No. 1, p. 21-23
    Received: Dec 19, 1969

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Variability in Optimum N Rates for Corn1

  1. O. P. Engelstad and
  2. W. L. Parks2



A study of corn (Zea mays L.) yield responses to N fertilizer was conducted to determine the variability in economically optimum rates over time. These responses were obtained at two locations in Tennessee covering the period 1962 to 1966. In each experiment, nine replicates of N response were available for each year.

The results of this analysis showed relatively little season-to-season variation in optimum rates. The data also showed the average optimum rates of N to be fairly close to those for maximum yields at current prices of N.

The study also showed that a fairly wide range in choice of N rate is possible without seriously affecting profit. This might be regarded as the “relevant range” of N application and one of more meaning to farmers than specific rates. Research should show where these ranges are for various crop-soil combinations.

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