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Published in Soil Sci Soc Am J 25:349-352 (1961)
© 1961 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The Effect of Temperature and Moisture on Exchangeable Potassium1

Allan F. Burns and Stanley A. Barber2

ABSTRACT

The influence of temperature and moisture on the release of nonexchangeable K to the exchangeable form was studied in the laboratory. Varying moisture from 60 to 100% of moisture equivalent was found to have no effect on the release of nonexchangeable K at temperatures from 1° to 80° C. Temperature caused increases in the level of exchangeable K in all but one case. The higher the temperature, the greater was the rate of release of nonexchangeable K.

The first release of K appeared to conform to a first-order reaction, while subsequent release was of a zero-order nature. Activation energies were determined from data obtained by the incubation of soils at three temperatures. These values were in the range of 11,000 to 26,000 cal. per mole.

Data obtained by oven-drying soils before and after incubation at 118° C. indicate that the increases in exchangeable K obtained by these two methods were due to different reactions.

NOTES

1 Journal paper No. 1692. Purdue University Agr. Exp. Sta. Lafayette, Ind. Contribution from the Department of Agronomy. Presented before Div. II, Soil Science Society of America, Dec. 8, 1960, at Chicago, Ill. This research was supported in part by a grant-in-aid from the American Potash Institute.

2 Graduate Assistant and Professor of Agronomy, respectively, Purdue University.

Received for publication December 12, 1960. Accepted for publication May 4, 1961.






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Copyright © 1961 by the Soil Science Society of America.