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This article in AJ

  1. Vol. 62 No. 6, p. 726-728
    Received: Jan 15, 1970

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Relationship Between Grain Yield and Leaf N, P, and K Concentrations for Corn (Zea mays L.) and the Factors that Influence this Relationship1

  1. R. E. Voss,
  2. J. J. Hanway and
  3. L. C. Dumenil2



Corn grain (Zea mays, L.) yield and leaf N, P, and concentrations were measured for 575 plots at 23 sites in western Iowa on Marshall and Monona soils. Variables incinded applied N, P, and K, indigenous fertility, plant population, soil yielding potential, past cropping, and soil moisture. The multiple-regression equations for yield, as a function of linear and quadratic leaf concentrations, resulted in an R~ of only 0.24. A satisfactory equation contained linear, quadratic, and interaction terms for leaf N and P, several environmental factors, and the interactions among the leaf and environmental factor terms. The R2 of this equation was 0.71. Because of the general adequacy of leaf K, it addition to the above model did not improve the relationship. Leaf nutrient concentrations at predicted maximum yield and concentrations at 95% of predicted maximum yield varied with past cropping, plant population, soil yielding potential, and soil moisture. These experiments suggest that interpretation of leaf analyses should include consideration of soil, management, and climatic factors.

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