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This article in SSSAJ

  1. Vol. 33 No. 3, p. 427-429
    Received: Dec 11, 1968
    Accepted: Feb 5, 1969

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Effect of Soil Potassium, Potassium Fertilizer and Method of Fertilizer Placement upon Corn Yields1

  1. W. L. Parks and
  2. W. M. Walker2



A quadratic regression model including selected linear interactions was fitted to yields of corn (Zea mays L.) grown on a Hartsells loam having varying K soil test levels and K fertilizer applications in the row and broadcast. Inclusion of 3 years of observation in the analysis produced no interaction of year and the parameters for K soil test level or K fertilizer application. There were significant single factor and interaction effects on corn yields due to soil test K levels and K fertilizer applied broadcast or in the row. The corn yield prediction equation illustrates the effect of row or broadcast K upon corn yield at different K soil test levels.

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