Abstract
The objectives of this study are to investigate the effect of surface, subsurface and deep sewage drip irrigation systems on emitter performance and water use utilization of Date Palm(Sukariah Cv)with different depths of irrigation water. These depths of applied water were 100% , 75% and 50% of reference evapotranpiration ETo. The results showed that the values of mean emitter discharge (q¯), the relative emitter discharge (R) and the reduction of discharge (qr)is greatly influenced by irrigation system in comparison with irrigation water depth. The values of emitters performance q¯ , R, qr for surface drip (DI) and deep sewage drip irrigation (DSDI) treatments were greater than those for subsurface drip ( SDI) treatments. The values of emitter performance of DI and DSDI treatments had a higher values of distribution uniformity(DU)for all irrigation water depths treatments and for total irrigation time comparing with SDI. The value of Date Palm yield increased for DSDI treatment compared with those of DI or SDI treatments. The minimum value of Date Palm yield was 103 kg/tree for the treatment (DI , 0.5 ETo ),while the maximum values of Date Palm yield were 175 and 172 kg/tree for the treatments (DSDI , 1.0 ETo ) and (DSDI , 0.75 ETo ), respectively. The maximum values of water use efficiency (WUE) were 1.34 and 1.31 kg/m3 for the treatments (DSDI , 0.5 ETo ) and (DSDI , 0.75 ETo),
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