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The Release of Nonexchangeable Soil Potassium to Cation-Exchange Resins as Influenced by Temperature, Moisture and Exchanging Ion¹

ABSTRACT

The release of nonexchangeable potassium (K) from a Haldimand clay to H-saturated Dowex 50-W cation-exchange resin was found to increase with increasing temperature although the increase in release was greater for a temperature increase from 50° to 80°C. than from 5° to 50°C. A decrease in moisture content decreased the rate of K-release at the higher temperature range but had little effect at 5° and 25°C. The effect of moisture content apparently resulted from an influence on movement of K from the point of release to the resin particle rather than on the release of K from the soil particles.

No release of nonexchangeable K to Na- or Ca-saturated Dowex 50-W resin occurred but the release increased linearly with the proportion of H-saturated resin added in combination with Na- or Ca-saturated resin. It appeared that the presence of the H⁺ ion was required for release. It could not be determined whether the mechanism of release involved an exchange of H⁺ or Al³⁺ for K in the mineral lattices or an acid decomposition of the K-bearing minerals.

¹ Contribution from Department of Soil Science, Ontario Agr. Coll., Guelph, Can. Presented before Div. II, Soil Science Society of America, Nov. 30, 1961, at St. Louis, Mo. This research was supported in part by a grant-in-aid from the American Potash Institute and constituted partial fulfilment of the requirements for the M.S.A. degree for the senior author.

² Formerly Graduate Fellow and Associate Professor of Soils, respectively.

Received for publication June 4, 1962. Accepted for publication August 1, 1962.