Downward movement of surface-applied potassium as related to source, soil type, and water quality
AuthorsT. J. Ganje
A. L. Page
Authors AffiliationsT. J. Ganje was Laboratory Technician IV, Department of Soils and Plant Nutrition, Riverside; A. L. Page was Associate Professor of Soil Science and Associate Chemist, Department of Soils and Plant Nutrition, Riverside.
Hilgardia 40(5):149-160. DOI:10.3733/hilg.v40n05p149. April 1970.
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.
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