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This article in AJ

  1. Vol. 54 No. 3, p. 267-271
    Received: Aug 3, 1961

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Generalization of Yield Equations in Two Variables: III. Application of Yield Data from 30 Initial Fertility Levels1

  1. Regis Voss and
  2. John Pesek2



Restrictive second degree polynomial yield equations in N and P for oats grown in the greenhouse at each of 30 different initial fertility levels within one soil type were utilized in the application of a generalization procedure previously proposed in this series. A multiple regression model including N and P fertilizer and soil test levels plus all possible linear interactions gave good evidence that the yields from the different initial fertility levels belonged to the same general yield surface.

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