This investigation was carried out in Gemmeiza Agric . Res. St. during season 2010 /2011 to study the effect of irrigation systems, i.e. traditional, siphon and gated pipes, planting methods (planting one ridge with width 1.25 m and planting two ridges with width 2. 5m ) and the influence of different irrigation regimes ( irrigation at 40%, 60% and 80 %) of the available soil moisture depletion ,on yield and components and water use efficiency for watermelon .Data indicated that the better vegetative growth plant parameters (fresh weight, stem length and number of branches /plant the ratio was 9.36 , 7.25 and 22.91 % resp.) ,fruit characters ( fruit weight, length and diameter the ratio was 6.89 , 11.09 and 21.7% resp. ), fruits shape homogenous by 9% (ratio length/ diameter ) ,yield by 7.25 % and water use efficiency by 32.36% resulted when using gated pipes compared with the traditional irrigation system . Planting methods for tested irrigation system gurma watermelon under study by increased width of 2.5m with planting two ridges increase vegetative growth parameters (fresh weight, stem length and number of branches /plant by 2.65 ,3.77 and 6.93 % resp.) ,fruit characters ( fruit weight, length and diameter), fruit shape homogenuity (ratio length/ diameter by 2.37, 6.62 , 13.92 and 7.34 % resp.) ,yield and water use efficiency (W.U.E.) by 4.27 and 15.41 % compared to planting one ridge with width 1.25 m. Subjecting Gurma watermelon plants to drought- stress to 60and 80 %compared to irrigated at 40 %soil depletion reduced in vegetative growth parameters (fresh weight, stem length and number of branches /plant by 3.87 , 7.03 , 4.76 , 9.54 and 10.81 ,14. 62 % resp. ) ,fruit characters ( fruit weight, length and diameter by 2.43 , 5.89 , 4.18 ,8.19 and 5.20 ,10.93 % resp. ), and yield by 5.52and 7.05 %.
To save irrigation water ,increase yield and W.U.E. ,it is recommended to irrigate by gated pipes ,planting two ridges with width of 2.5m and irrigating after depletion of 40 %of available soil moisture under Gemmeiza conditions .