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This document is Circular 1248, one of a series of the Soil and Water Science Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Original publication date: September 2002. Revised February 2009. Visit the EDIS Web site at http://edis.ifas.ufl.edu. 2. Rao S. Mylavarapu, Assistant Professor, Nutrient Management Specialist and Director, UF/IFAS Extension Soil Testing Laboratory, Department of Soil and Water Science, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32610. The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. U.S. Department of Agriculture, Cooperative Extension Service, University of Florida, IFAS, Florida A. & M. University Cooperative Extension Program, and Boards of County Commissioners Cooperating.
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Mylavarapu et al. (1969) studied this question.
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