Abstract
Sorption of K+ and NH4+ from percolating 0.1, 0.01 and 0.001 A" solns. of the cations by 2 Hawaiian clay soils decreased greatly with decreases in concs. of the cations. At the lowest conc. (0.001 [image]) the sorption was low (0-1.4 m.e. per 100 g. of soil, depending upon the salt used and the degree of Ca saturation). Increasing the degree of Ca saturation of soils increased the sorption of K+ and NH4, but the effect was not so marked as was that of the conc. Sorption of K+ and NH4+ (by the completely electro-dialyzed soil) was much higher from the sulfates than from the chlorides of these cations.

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