POTASSIUM POTENTIAL OF SOME SELECTED SOILS

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Abstract
Equilibration of 11 soils in 0.002 M CaCl2 different amounts of KC1 gave activity ratios (ARK) which showed a higher degree of correlation with the portion of K-uptake derived from the exchangeable form than with the total K-uptake by plants. The ARK values together with estimates of the quantities of K released ([long dash][DELTA]K[degree]) as obtained from equilibration curves were fpund to be much more indic- ative of the total K-uptake than were the ARK values only. The ratio[long dash][DELTA]RK/ARKe, or potential buffering capacity (PBCK), showed some relation to the amount of non-exchangeable K which was an important source of K in most of the soils. The PBCK values correlated with the clay content of the soils and the degree of K-fixation.
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