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[en] Field experiment was conducted to study the influence of different levels of irrigation water salinity on actual evapotranspiration, water stress coefficient, yield and water use efficiency of both groundnut and wheat crops growing on sandy soil under trickle irrigation system located at 30o 24'N latitude, 31o 35'E longitude while the altitude is 20 m above the sea level.Four irrigation water salinity levels were used for both crops, they are; 2.4 (S1), 2.7 (S2), 3.3 (S3) and 4.4 (S4) dS m-1, for groundnut and 4.9 (S1), 6.3 (S2), 8.7 (S3) and 13 (S4) dS m-1, for wheat respectively besides a fresh water (FW) as a control treatment (0.5 dS m-1). Cattle manure was added as a soil amendment at a rate of 48 m3 ha-1. Neutron moisture meter was used to determine soil moisture content and depletion through the soil depths of 30, 45, 60, 75 and 90cm. Soil moisture content at 15 cm soil depth was determined gravimetrically. The applied irrigation water was 700 mm/season for groundnut and 550 mm/season for wheat based on 100 % of the recommended crop water requirements according to FAO No.33. (1979). The obtained results showed that the actual evapotranspiration (ETa) and water stress coefficient (Ks) were slightly deceased by increasing the salinity of irrigation water especially under (S4) irrigation salinity treatment for both crops.