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This article in SSSAJ

  1. Vol. 20 No. 2, p. 176-179
    Received: Apr 15, 1955

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Fertilizer Evaluation: I. Fundamental Principles1

  1. C. A. Black and
  2. C. O. Scott2



Evaluation of different fertilizer sources of a common nutrient is discussed in relation to the principles of quantitative biological assay. Criteria for examining the comparative effects of different fertilizers are described. Fertilizer effects are classified into different categories on the basis of these criteria. An approach is described for extending the methods of classical biological assay to cover certain practical cases that do not meet the theoretical requirement.

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