Quantity-Intensity Relationships of Potassium in Representative Soils of Andhra Pradesh

The quantity-intensity relationships of potassium in important soil groups of Andhra Pradesh were assessed. Exchangeable K tended to increase with clay content. Labile K (K_L) constituted only a fraction of the exchangeable K. In soils with high amounts of clay and organic carbon the content of readily available K, as revealed by equilibrium activity ratio (ARo) and change in free energy (ΔF) values, was small. Conversely, in soils low in day, organic carbon and cation exchange capacity, the long-term potassium supplying power, as indicated by buffer capacity values, was found to be poor. Soil reaction and soluble salt content too seemed to influence the quantity-intensity parameters.