EFFECT OF DIFFERENT IRRIGATION REGIMES AND POTASH FERTILIZER ON WATER USE EFFICIENCY OF RICE ORYZA SATIVA L. YASAMEEN CULTIVARHamza N.A. Al-Delamee and Kholoud N. A. Al-ZiniAbstract A field experiment was carried out in Iraq to investigate effect of irrigation regimes and potash fertilizer on Water-Use Efficiency of rice using (RCBD) Design, Irrigation regimes were the first factors namely continuous flooding Irrigation (I1) as control, every 5 days Irrigation (I2), every 7 days Irrigation (I3) and every 10 days Irrigation (I4) and the second factor was fertilizer levels namely, 30 Kg D-1(K1) as control 40 Kg D-1, (K2), 50 Kg D-1 (K3) and 60 Kg D-1 (K4), means were compered using (L.S.D) test and the results show the following: (I2) treatment was significant superior on traits of plant height by 4.8 % and (WUE) by 270% in comparison with control (I1) and there was no significant difference with biological yield and grain yield at the same time there were significant superiority of most potash fertilizer treatments specially (K4) with different percentages 10% plant height, 17.1 % biological yield, 32.6% grain yield and for (WUE) by 86% approximately so, (K4) treatment decrease water utilization by 24.5% significantly (I2) treatment clearly decreased the quantity of utilization water of plant life cycle with sustainability of productivity ability without significant difference as compared with control (I1) which using plenty of water, and importance of potash fertilizer treatments became clear, for productivity increment by superiority of (K4) treatment as compared with control (K1) for all studied traits on these conditions during clearly synergistic relationship among (K) and (I) treatments. |