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Fertilizer Evaluation: I. Fundamental Principles

1956; Wiley; Volume: 20; Issue: 2 Linguagem: Inglês

10.2136/sssaj1956.03615995002000020010x

1435-0661

C. A. Black, Caillou Scott,

Animal Nutrition and Health

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.