INTERACTION BETWEEN POTASSIUM, AMMONIUM AND CALCIUM FOR SORPTION IN DIFFERENT TYPES OF SOILS

The experiment was conducted in the Soil Science field Laboratory of Bangladesh Agricultural University, Mymensingh from January to June 2008 to determine the interaction effects of K⁺ and NH₄⁺, K⁺and Ca²⁺, and K⁺ and (NH₄⁺+Ca²⁺) for sorption in Madhupur BADC farm, and BAU farm soils. 50ml of sorption solution of different combinations obtained from 0, 45 and 60ppm K⁺,0 and 100 ppm NH₄⁺, 0 and 30ppm Ca²⁺ were added to the 10 gm soil in 100ml plastic bottles. The difference in concentration between added sorption solution and equilibrium solution was considered as the amount of sorption by soil. The results of the study indicated that the K⁺ sorption progressively increased with increasing concentration. The sorbed amount of K⁺ decreased as the back ground concentrations of NH₄⁺, Ca²⁺ and (NH₄⁺+Ca²⁺) increased. However, the sorbed amount of NH₄⁺ gradually decreased as the increasing of background concentrations of K⁺, Ca²⁺ and (Ca²⁺+K⁺). In the same way the sorption of Ca²⁺ increased with increasing its concentration. The sorbed amount of Ca2+ gradually decreased as the background concentrations of K⁺, NH₄⁺ and (NH₄⁺+K+) increased. Sorption of K⁺, NH₄⁺and Ca²⁺ was higher with BAU farm than BADC farm soil.