الفهرس 
introuduction
Distribution uniformityOnly 14 pages are availabe for public view
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Abstract
The aim of this study which was carried out in Sakha Agricultural Research Station, Kafr el-Shiekh Governorate was to determine the most suitable irrigation frequencies and quantities in Snap bean and Squash grown under drip irrigation system. The irrigation intervals of snap bean were (A: irrigation every 4 days, B: irrigation every 8 days, C: irrigation every 12 days and D: irrigation every 16 days), where the corresponding irrigation intervals of Squash were (A: irrigation every 2 days, B: irrigation every 4 days, C: irrigation every 6 days and D: irrigation every 8 days). Irrigation quantities were based on pan evaporation (0.8 and 1.0 Ep). the main objective of this study: 1-Evaluation of the implemented drip irrigation system. 2-Determine the most suitable irrigation scheduling for snap bean and squash crops under drip irrigation system. 3-Upgrade the water utilization efficiency of snap bean and squash in North Nile Delta region. 4-Determine the effect of irrigation rates on soil salt distribution under and around the emitters. The main results indicated that:1- The implemented system of drip irrigation in this study can be classified as very good from manufacturing coefficient (CV), Uniformity coefficient (UC), Distribution Uniformity (DU) and emitter flow rate (qvar) . The mean corresponding values are 0.09, 96.01 %, 87.40% and 28.53%, respectively. 2- The highest seed yield 0.080 kg/m2 resulted from irrigation every 4 days. Regarding to the amount of water applied, the highest value 0.060 kg/m2 was obtained from 1.0 Ep treatment. The interaction hadn’t any significant effect on snap bean seed yield while, The highest yield 0.190 kg/m2 Was obtained from 2 days treatment. While, the lowest yield 0.053 kg/m2 was obtained from 8 days treatment. As for water applied , the highest yield 0.110 kg/m2 obtained from 1.0 Ep treatment. While the lowest yield 0. kg/m2 was resulted from 0.8 Ep treatment. On the other hand, no significant effect was obtained from the interaction of the studied factors of irrigation interval and watering amount. 3- The maximum 1.42 kg/m3. as W.Ut.E. snap bean dry seed resulted from treatment A2 i.e. watering each 4 days, with 1.0 Ep as irrigation level.while, The maximum 0.75 kg/m3. as W.Ut.E. squash fruits could be resulted from treatment A2 i.e. watering each 2 days, with 1.0 Ep as irrigation level. 4- The highest salt content under drip irrigation was obtained at soil surface of 0-10 cm for all irrigation treatments at the peripheral of the wetted zone. By increasing the irrigation intervals the movement of salts increased in horizontal direction which associated with wetting pattern. At the same time, increment in vertical direction to downward was also occurred . No clearly effects by applied the two irrigation levels on salt distribution in the soil under drip irrigation system