Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 September 1963
Published in Agron J 55:495-499 (1963)
© 1963 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Factors Affecting the Rate of Release of Fertilizer from Capsules1

I. U. Ahmed, O. J. Attoe, L. E. Engelbert and R. B. Corey2

Synopsis: Capsulation of fertilizer with polyethylene film gave significant increases in yield of corn and recovery of N and P. Rate of release of fertilizer from capsules was directly related to temperature, number of pinholes per capsule, and vapor pressure lowering of water by the fertilizer, but, generally, was independent of the presence b f the crop and of soil texture, soil moisture between 25 and 100% field moisture capacity, and leaching of the soil.

1 Contribution from the Department of Soils, University of Wisconsin, Madison. Published with the approval of the Director, Wisconsin Agr. Exp. Sta. Part of a dissertation submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree, University of Wisconsin. This paper was presented at the annual meeting of the American Society of Agronomy, St. Louis, Mo., November, 1961. This work was supported in part by the Research Committee of the Graduate School with funds provided by the Wisconsin Alumni Research Foundation.

2 Research Assistant, Professor, Professor, and Associate Professor of Soils, respectively, University of Wisconsin.

Received for publication March 20, 1963.




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The SCI Journals Crop Science Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1963 by the American Society of Agronomy.