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Downward movement of surface-applied potassium as related to source, soil type, and water quality

Author

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  • Ganje, T. J.
  • Page, A. L.

Abstract

Laboratory soil columns were utilized for comparison of four K sources—Sul-Po-Mag, KNO3, K2SO4 and Fritted Potash applied to soils differing in mineralogical composition and leached with two irrigation waters. Reduction in CEC, exchangeable plus soluble K, and K in the leachate were measured. It is evident that K status of the montmorillonitic and vermiculitic soils differed markedly. There was greatest K fixation with the latter soil. The use of Fritted Potash, when compared to more soluble K sources such as KNO3 and K2SO4, on soils which do not fix K may reduce considerably the amount of K lost by leaching. For soils which fix K in a difficultly exchangeable form, the amount of K fixed from applications of the slightly soluble sources are similar to the amounts fixed from applications of the very soluble sources.

Suggested Citation

  • Ganje, T. J. & Page, A. L., 1970. "Downward movement of surface-applied potassium as related to source, soil type, and water quality," Hilgardia, California Agricultural Experiment Station, vol. 40(5).
    • Handle: RePEc:ags:hilgar:381923
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