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Published in Soil Sci Soc Am J 20:176-179 (1956)
© 1956 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Fertilizer Evaluation: I. Fundamental Principles1

C. A. Black and C. O. Scott2

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.

NOTES

1 Journal Paper No. J-2624 of the Iowa Agr. Exp. Sta., Ames. Iowa. Project No. 1183.

2 Professor of Soils and Graduate Student, respectively.

Received for publication April 15, 1955.




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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1956 by the Soil Science Society of America.