EVALUATION FOR EFFECTS OF POTASSIUM FERTILIZATION FROM SULFATE AND CHLORIDE SOURCES ON SOME MAIN FIELD CROPS

Four factorial field trials for some main field crops. i.e. wheat, faba bean, cotton and rice were carried out at Sakha Agric. Res. Station to evaluate • potassium fertilization from two fertilizer sources, i.e. K2SO4 and KCI. The important results could be summarized in the following points: • Potassium fertilization with 24 kg K20/fed. (as K2Sa4 fertilizer) in‌creased crop's yields by 20.76. 24.45, 6.80 and 8.10 % for wheat, faba bean, cotton and rice, respectively; except for faba bean, k-fertilization with 12 kg K20/fed. (as KCI fertilizer) insignificantly in‌creased such crops with parallel increments of 4.7, 16.49, 1.1 and 2.6%, respectively. • High K-rates of 48 kg K20/led. (as K-sulfate) or 24 kg K20/fed. ( as K-chloride) were not proper rates for such crops because of the insig‌nificant increments for the first fertilizer and side effects of chloride anion Cr for the second fertilizer. • Interaction effects between K2934 and KCI fertilizers on crops' yields have revealed some antagonistic effects related to S02" and Cr an‌ions from soil and/or fertilizer especially in case of adding high K-rates which affected most nutrient's absorption by plants and subse‌quent crop's yields. • For the studied soils, it may be recommended that potassium sulfate fertilizer is more effective than potassium chloride fertilizer for the crops under research.