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Potassium Exchange in Five Southern California Soils with High Potassium Fixation Capacity¹

ABSTRACT

The K exchange with Ca and Mg in five southern California profiles with high K fixation capacity was studied. The objective was to obtain a correlative relationship between K selectivity with varying proportions of K, Ca, and Mg on the exchanger phase of the soils. A linear relationship between E_P (the ratio of adsorbed K to adsorbed Ca and Mg) and potassium adsorption ratio (PAR = [K⁺]/([Ca²⁺]+[Mg²⁺])^1/2) was found for all the soils investigated. A representative relationship E_P = 0.134 + 0.026 (PAR), with high degree of correlation (r = 0.955), was found for the surface layers (0–30 cm) of all five soils studied. A sharp decrease in K_G, the Gapon selectivity coefficient with E_P increasing from 0 to 0.2 and ending with a levelling of K_G values between 0.7 to 3.2 (mol^–1 L)^1/2 was observed for all the soil profiles. The K_G relationship with potassium fixation showed a similar trend for all the soil profiles.

¹ Contribution from the Dep. of Soil and Environmental Sciences, Univ. of California, Riverside. Financial support from BARD is gratefully acknowledged.

² Postdoctoral Research Associate, Assistant Professor, Professor, and Staff Research Associate, respectively. Address for senior author now Dep. Soil Science, TECHNION, Haifa 32000, Israel.

Received for publication July 23, 1984. Accepted for publication March 26, 1985.