The amount of K fixation varied from 49.89 to 18.15% in respect of potassium chloride, 77.21 to 24.16% in potassium carbonate, 75.29 to 23.56% in potassium sulphate and 58.80 to 18.40% in potassium nitrate when K was applied @ of 20 to 1000 ng/ml. The relative fixation was highest when potassium was applied @ 20 Mg/ml and least was observed when applied @ 1000 Mg/ml indicating more availability of K in the soil. The Chautala soil showed the lowest degree of fixation irrespective of potassium forms. The mechanism of potassium fixation in soil through clays is believed to be the result of precipitation of potassium in the interior of the lattices or due to the concentration of the sheet of clay in consequence entry of K ions. The fixation of potassium at 20 Mg/ml level was the lowest in potassium chloride and highest in potassium carbonate. The different levels of the KC1 showed the lowest degree of fixation in the soil suggesting more availability of added K. It was observed that the fixation of potassium in different soil profiles with different anions of potassium was positively and significantly correlated with clay, silt, organic carbon and CEC. The fixation of K was negatively correlated with sand and positively with different level of applied potassium.
Carbonate, Chloride, Potassium fixation capacity, Su'phate and nitrate anions
