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This article in AJ

  1. Vol. 73 No. 1, p. 136-138
    Received: Jan 10, 1980

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Testing the Difference between Limiting Yields in Quadratic Fertilizer Response Curves1

  1. Hernan R. Tejeda2



Knowledge on whether or not fertilizer respom curves have the same limiting yield is useful when comparing fertilizers and estimating their availability coefficient. A statistical procedure to test the difference between limiting yields of two quadratic response curves is presented. The test is contingent to the assumption that the estimated nutrient rates corresponding to the limiting yields are constants. Application of the procedure is illustrated when comparing rice (Oryza sativa L.) response to two sulfur-coated ureas (SCUs) differing in solubility with split application of urea. Only the SCU with lower solubility produced a significantly larger limiting yield than split application of urea.

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