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Published in Soil Sci Soc Am J 26:230-233 (1962)
© 1962 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Potassium Ion Fixation, Equilibria, and Lattice Changes in Vermiculite1

Everett J. Dennis and Roscoe Ellis, Jr.2

ABSTRACT

The influence of different levels of added potassium on the equilibrium values of water-soluble, exchangeable, and "fixed" potassium in a vermiculite system was investigated by chemical methods. X-ray diffraction techniques were used to establish the levels of added potassium necessary to result in changes in the basal "d" spacing of the vermiculite lattice. The effects of dehydration and complementary ion were studied.

In general, fixation of potassium by vermiculite against chemical extraction was associated with a change in the basal "d" spacing of the vermiculite lattice as shown by X-ray diffraction. However, some potassium was fixed against chemical extraction which was not detected by the X-ray diffraction method employed. Dehydration increased potassium fixation. Calcium and sodium systems were compared to determine the influence of the complementary ion on the fixation process. For a given level of exchangeable potassium, more fixation of potassium occurred when calcium was the complementary ion.

NOTES

1 Contribution No. 751, Department of Agronomy, Kansas Agr. Exp. Sta., Manhattan. Portion of a dissertation presented by the senior author as partial fulfillment of the requirements for the Ph.D. degree in agronomy at Kansas State University. Presented before Div. II, Soil Science Society of America, at Chicago, Ill., Dec. 8, 1960.

2 Former Graduate Research Assistant, and Professor of Soils, Kansas State University, respectively.

Received for publication June 12, 1961. Accepted for publication January 3, 1962.






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