Relationship between potassium forms and selected physico-chemical properties of some intensively

Abstract

A study was carried out to determine the distribution of forms of K (water soluble K, exchangeable K, non-exchangeable K, lattice K and total K) of potassium in some intensively vegetable cultivated soils of transitional zoneDharwad district using standard analytical procedure. The soils from three dominant vegetable growing taluka namelyDharwad, Hubballi and Kalaghatagi. Which comprises both black and red soils. The concentrations of total K in soils rangedfrom 2812.5 to 12222.5 mg kg-1. Kalaghatagi taluka soils showing the lowest (<0.05) value. water soluble K and exchangeableK concentrations in the soils ranged from 1.3 to 12.9 mg kg-1 and 121.1 to 267.1 mg kg-1 respectively, with the Kalaghatagitaluka soils showing the lowest values (P <0.05) for both K forms. In the study non exchangeable K constituted measuredin the soils varied between 300.5 to 1014.5 mg kg-1. The study showed that exchangeable K constituted the highestproportion of the total K measured in the soils, while the proportion of water soluble K in the total K measured was thelowest. Pooling all the data obtained with study, water soluble K, exchangeable K, non-exchangeable K, lattice K and totalK concentrations positively corelated with organic carbon, CEC and clay. All the forms of K in soils studied were positivelycorrelated with each other suggested that dynamic equilibrium exists among K forms