It is quite common that soils differ markedly in their K releasing power.The dynamic equllibrium existing between different forms of K and the type of clay minerals present were responsible for such variations Based on the cumulative K release characteristics soils of different groups were classified into three categ- ories with regard to their K releasing power.The cumulative K release curves were of the quadratic type and hence second degree equations were fitted by the latest square principle.From these equations also it was possible to categories the magnitude of the K releasing power of the soils.The cumulative values of K released by successive extraction with 0.01N HCL gave a positive significant correlation for K uptake.
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