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This article in AJ

  1. Vol. 57 No. 5, p. 460-463
    Received: June 1, 1964

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Geometrical Determination of Uncontrolled-Controlled Factor Relationships Affecting Crop Yield1

  1. Regis Voss and
  2. John Pesek2



A procedure for taking into account uncontrolled variableS within and among sites when computing yield functions is described and applied to fertilizer response data. The procedure was effective in predicting soil nutrient by fertilizer nutrient interactions for an experiment with 30 soils, each treated with 10 N and P fertilizer combinations.

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