Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 July 1965
Published in Agron J 57:331-334 (1965)
© 1965 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Availability of Phosphorus in Rock Phosphate-Sulfur Fusions1

H. A. Kittams and O. J. Attoe2

Synopsis: Recovery of P by ryegrass was inversely related to granule size and ratio of rock phosphate to sulfur. Both the 1:1 and 2:1 ratios of –40 mesh granules compared favorably with superphosphate as a source of P. Recovery of P from fusions added to calcareous soils was quite low. After 4 weeks incubation, the amounts of sulfur oxidized were quite similar for soil moisture contents between two-thirds and twice field moisture capacity.

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, Denver, Colo., November 1963. This study was supported in part by funds provided by The Sulphur Institute.

2 Formerly Research Assistant (now Associate Professor of Soils, Montana State University, Bozeman) and Professor of Soils, University of Wisconsin.

Received for publication December 8, 1964.




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Journal of Natural Resources
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Environmental Quality		 The Plant Genome
Copyright © 1965 by the American Society of Agronomy.