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Published in Soil Sci Soc Am J 27:283-287 (1963)
© 1963 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Variation in Exchangeable K and Relation to Intergrade Layer Silicate Minerals1

D. L. Carter, M. E. Harward and J. L. Young2

ABSTRACT

A mica-vermiculite material was treated with MgCl2 and converted to a typical Mg-vermiculite. The same material was treated with AlCl3 and converted to a 14Å. mineral concluded to be a vermiculite-chlorite intergrade similar to those recently reported in the literature. AlCl3 treatment of Mg-vermiculite also resulted in intergrade formation. In B22 and C horizon samples of a Dayton soil, added aluminum blocked K fixation and increased K release when samples were cycled through various wetting and drying treatments. The roles of aluminum in release of K and in intergrade mineral formation were shown to be interrelated. It was concluded that Al3+ replaces K+ in mica and Mg2+ in vermiculite lattices and then probably forms a sixfold coordination compound with H2O or (OH)- which blocks lattice collapse upon subsequent K-saturation. The increase in exchangeable K upon drying of soils appears to be related to the replacement of fixed K+ by Al3+ arising from degradation of minerals.

NOTES

1 Joint contribution from the Soil and Water Conservation Research Division, ARS, USDA, and the Department of Soils, Oregon State University, Corvallis. Technical paper No. 1536, Oregon Ag. Exp. Sta.

2 Research Soil Scientist, SWCRD, ARS, USDA, Associate Soil Scientist, Oregon Agr. Exp. Sta., and Chemist, SWCRD, ARS, USDA, respectively. Senior author's present address: P. O. Box 267, Weslaco, Tex.

Received for publication June 18, 1962. Accepted for publication October 26, 1962.






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