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Abstract

 

This article in SSSAJ

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


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doi:10.2136/sssaj1956.03615995002000020010x

Fertilizer Evaluation: I. Fundamental Principles1

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

Abstract

Abstract

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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