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Two field experiments were conducted at Sakha Agricultural Research Station, Kafr El-Sheikh Governorate. The site is located at 31 0 07ˉ N Latitude and 30 0 57ˉ E longitude with an elevation of about 6 meters above mean sea level. This location represents the conditions of the North Middle Nile Delta region during the two successive winter growing seasons 2012/2013 and 2013/2014 to investigate the effect of irrigation intervals and plant densities on faba bean yield, some yield attributes and some water relations under drip irrigation system. Faba bean (Vicia faba L.) seeds, variety Sakha 2, were planted on 10 th and 15 th November and harvested on 28 th April and 2 nd May in the first and second growing seasons, respectively. A split plot design with four replicates was used. The main plots were randomly assigned by (irrigation intervals, I) which were I1 (irrigation every 6 days), I2 (irrigation every 9 days), I3 (irrigation every12 days), I4 (irrigation every15 days), I5 (irrigation every18days). The submain treatments were also randomly assigned by (plant densities, D) which were, D1 (planting one plant on one lateral from each side adjusted with opening the emitter), D2 (planting two plants on one lateral from one side adjusted with the emitter), D3 (planting four plants on one lateral on the two sides of the emitter), two plants from each side and D4 (planting four plants on one lateral on the two sides of the emitter, two plants from each side). In addition, two plants were planted in the middle of the two adjacent emitters with one plant in each side. The obtained results can be summarized as follows:Data clearly illustrated that, the values of seasonal water applied, water stored in the effective root zone and water consumptive use were affected by irrigation intervals, where the highest overall mean values for the abovementioned three studied parameters were recorded under irrigation interval (I1) and the values are 1475.52, 1205.20 and 1059.44 m 3 /fed. On the other hand, the lowest values for the same abovementioned studied parameters were recorded under irrigation interval, I5 and the values are 990.64, 905.16 and 850.44 m 3 /fed. for seasonal water applied, water stored in the effective root zone and water consumptive use, respectively. Generally, the values of the three abovementioned studied parameters can be descended in order (I1) > (I2) > (I3) > (I4) > (I5). Concerning water application efficiency (WAE%) the mean values were slightly affected by irrigation intervals. The highest mean values were recorded under irrigation interval (I4) and the values are 94.92 and 94.47 %. The lowest mean values were recorded under irrigation interval (I1) and the values are 81.57 and 81.79% in the first and second growing seasons, respectively. Regarding, water productivity (WP) and productivity of irrigation water (PIW), the highest overall mean values were recorded under irrigation interval (I5) and the values are 1.38 and 1.19 kg/ m 3 . Meanwhile, the lowest overall mean values were recorded under irrigation interval (I1) and the values are 1.29 and 0.92 kg/ m 3 for (WP) and (PIW), respectively. Concerning water consumptive use efficiency (Ecu), the

journal of soil sciences and agricultural engineering /journal of soil sciences and agricultural engineering

EFFECT OF IRRIGATION INTERVALS AND DIFFERENT PLANT DENSITIES ON FABA BEAN YIELD, SOME WATER RELATIONS AND SOME SOIL PROPERTIES UNDER DRIP IRRIGATION SYSTEM IN NORTH MIDDLE NILE DELTA REGION.