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This article in SSSAJ

  1. Vol. 49 No. 5, p. 1128-1133
    Received: July 23, 1984
    Accepted: Mar 26, 1985

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

  1. A. Shaviv,
  2. S. V. Mattigod,
  3. P. F. Pratt and
  4. H. Joseph2



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.

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