SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 29:148-150 (1965)
© 1965 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Phosphorus Adsorption Maximum as Measured by the Langmuir Isotherm and Its Relationship to Phosphorus Availability1

J. R. Woodruff and E. J. Kamprath2

ABSTRACT

The phosphorus adsorption maximum as calculated by the Langmuir isotherm was determined for a number of soils with a wide range in chemical properties. Neutralization of exchangeable aluminum markedly reduced the P adsorption maximum. The growth of millet was related to the degree of saturation of the P adsorption maximum. The soils with a large P adsorption maximum did not require as high a P saturation as those with a low adsorption maximum. Maximum yields on the limed soils were obtained when the equilibrium solution concentrations of P were greater than 0.1 x 10-4 moles/liter of P. A much higher concentration of P was needed on the soils with a high saturation of exchangeable aluminum to give maximum yields, however, the yields were lower than on the limed soils.

NOTES

1 Contribution from the Department of Soil Science, North Carolina Agr. Exp. Sta., Raleigh, N. C. Presented before Division S-4, Soil Science Society of America, Nov. 21, 1963, Denver, Colo. Part of a thesis submitted by the senior author in partial fulfillment of the requirements of a M.S. degree. Submitted with the approval of the Director as paper No. 1856 of the Journal Series.

2 Research Instructor and Professor of Soil Science, respectively.

Received for publication August 10, 1964. Accepted for publication November 23, 1964.






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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 © 1965 by the Soil Science Society of America.