Saied, M.M.; H.A. Shams El-Din; E.H. Omar and A.A.S. Gendy( 2005). EFFECT OF WATER REGIME AND POTASSIUM FERTILIZER LEVELS ON YIELD OF SOYBEAN AND WATER USE EFFICIENCY AT NORTH DELTAOfficial Publication of Faculty of Agriculture , Mansoura University
Abstract: Two field experiments were carried out at Sakha Agric. Res. Station in 2004 and 2005 seasons to study the effect of different soil moisture depletion, 35, 50 and 65% and potassium fertilizer levels; untreated 24 and 48 kg K2O/fed. on soybean yield, some water relations and N, P, K concentrations of seeds The obtained results revealed that the irrigation at 50% soil moisture depletion surpassed the other two depletions (35 and 65%) in increasing the seed yield of soybean by 6.37 and 14.29% in the 1st season and 9.09 and 16.59 in the 2nd season. Application of 48, kg K2O/fed, increased seed yield by 21.53 and 13.23% than application of 0.0 and 24 kg K20/fed. in the 1st season. While, in the 2nd season the seed yield increased by 21.43 and 10.36%. The greatest amounts of water consumptive use were found to be 2007.43 and 1981.83 m3/fed. in the 1st and 2nd seasons respectively under 35% depletion. The most suitable water applied throughout the two seasons are 2646.4 and 2490.7 m3/fed. in the 1st and 2nd seasons under irrigation 50% depletion of available soil moisture which produced the greatest seed yield. The highest values of crop water use and field water use efficiencies were achieved from interaction between irrigation at 50% depletion of available soil moisture and application of 48 kg K2O/fed. in both seasons.
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