Journal of the Indian Society of Soil Science

Relationship between Q and I parameters of labile K in selected soil series of southern Karnataka was studied. Quantity parameters like K_L, K_x, K⁰ and PBC^K showed wide variation among the soil series and also within soil series. Intensity Parameters like AR_o^K and free energy of exchange (ΔG⁰) showed similar trend. K⁰ values compared favourably with ammonium acetate extractable K in these soils. There was positive correlation between AR_c^k and PBC_K, pH, CaCO₃ CEC etc. Soils with higher clay content recorded higher K_x and PBC^K values. Mean values of ΔG⁰ (−3.19 kcal eq⁻¹) of all the soil series in the present slndy were closer to the lower limit of optimum K availability.