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Published online 1 July 1963
Published in Agron J 55:311-313 (1963)
© 1963 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Availability of Fertilizer Phosphorus in Three Latosols of Hawaii1

S. K. DeDatta, R. L. Fox and G. Donald Sherman2

Synopsis: These soils immobilized 98 to 99.8% of added P. In 2 acid soils, liming to pH 5.5 reduced the extractable aluminum by more than half. The amount of added P that remained in solution after 1 hour equilibration increased progressively when the pH was adjusted to 5.8 in one of these soils and to 6.6 in the other. Evidence indicated that sudangrass seedlings, grown in vermiculite, lost P when the root system was placed in contact with soils having high fixation capacity.

1 Contribution from the Department of Agronomy and Soil Science, University of Hawaii, Honolulu, Hawaii. Published with the approval of the Director, Hawaii Agr. Exp. Sta., as Tech. Paper No. 580. This research was supported by a grant from the National Science Foundation.

2 Research Fellow, Rockefeller Foundation; Associate Soil Scientist; and Head, Department of Agronomy and Soil Science, University of Hawaii, respectively. The authors wish to express their gratitude to J. C. Moomaw for his help during the course of this investigation.

Received for publication June 2, 1962.




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Copyright © 1963 by the American Society of Agronomy.