Effect of potassium adsorption on the zeolite

To study the effect of zeolite on potassium uptake and potassium and urea fertilizer use efficiency by wheat in a high specific surface soil in Golestan Province, a combined analysis used two completely randomized block design in this study (with 20 ton/ha topsoil zeolite clinoptilolite incorporated and without respectively) each of which included 5 treatments with 4 replications. Treatments were combined urea fertilizer, potassium sulfate, diammonium phosphate at (a) 0, 0 ,0 , (b) 200, 0, 250 , (c) 200, 100, 250, (d) 200, 200, 250 kg/ha respectively and also (e) urea fertilizer DCD potassium sulfate diammonium phosphate at 200, 15, 200 and 250 kg/ha. Potassium and nitrogen tissue concentration and soil potassium and nitrogen at both pre-heading and harvest were determined. Results show zeolite raised the potassium uptake and improved nitrogen and potassium apparent fertilizer use efficiency by grain and straw improved and their economic return.