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Potassium Exchange in Five Southern California Soils with High Potassium Fixation Capacity
Author(s) -
Shaviv A.,
Mattigod S. V.,
Pratt P. F.,
Joseph H.
Publication year - 1985
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1985.03615995004900050011x
Subject(s) - potassium , soil water , chemistry , adsorption , selectivity , cation exchange capacity , mineralogy , zoology , analytical chemistry (journal) , environmental chemistry , geology , soil science , biology , biochemistry , organic chemistry , catalysis
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 + ]/([Ca 2+ ]+[Mg 2+ ]) 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.