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Published in Soil Sci Soc Am J 49:1128-1133 (1985)
© 1985 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Potassium Exchange in Five Southern California Soils with High Potassium Fixation Capacity1

A. Shaviv, S. V. Mattigod, P. F. Pratt and H. Joseph2

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 EP (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 EP = 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 KG, the Gapon selectivity coefficient with EP increasing from 0 to 0.2 and ending with a levelling of KG values between 0.7 to 3.2 (mol–1 L)1/2 was observed for all the soil profiles. The KG relationship with potassium fixation showed a similar trend for all the soil profiles.

NOTES

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.






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