Two field experiments were carried out in the Desert Research Center (D.R.C.), Agricultural experimental station at El-Kharga, New Valley Governorate, during two growing seasons of 2005 and 2006, to study the effect of planting dates and plant densities on productivity of cowpea (Vigna Sinensis L., cv. Kareem 7). The soil texture was sandy clay loam containing 2.04 % organic matter, pH 8.3 and EC 4.4 dS/ m. Underground water was the source of irrigation its pH was 7.3 and EC 1.08 dS/ m. Combined analysis of the two seasons data showed the follows: 1-Planting on 15 March as well as the density of 224000 plants / fed. each gave the highest significant values in plant height, number of branches / plant, fresh and dry weight / plant, fresh and dry forage yield/fed, number of pods / plant, number of seeds / plant, seed weight / pod, 100-seed weight, biological yield, seed yield, straw yield and chemical composition such as, nitrogen, phosphorus, potassium, total carbohydrate, crude protein contents and TDN % in seeds and straw of cowpea plants. 2-The interaction between planting date and plant density had a significant effect on plant height, number of branches / plant, fresh and dry weight / plant, fresh and dry forage yield/fed, number of pods / plant, number of seeds / plant, seed weight / pod, 100-seed weight, biological yield, seed yield and straw yield. The highest values were obtained by planting on 15 March with the density of 224000 plants / fed. while the reverse were obtained by planting on 15 February with 84000 plants / fed. Planting on 15 March increased all chemical characters i.e., nitrogen, phosphorus, potassium, total carbohydrate and crude protein contents of cowpea plants under planting density of 224000 plants / fed., except TDN % of straw which gave the highest value by planting in1 st March with 224000 plant / fed.

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The main purpose of this investigation was to evaluate the yield, yield attributes and water use efficiency of Giza 126 barley cultivar under rainfed conditions. Two field experiments were carried out in flood plain of Wadi Hashim, Raas El-Hekma Region, East Mersa Matrouh, Matrouh Governorate, North Western Coast of Egypt, during tow winter growing successive seasons (2011/2012 and 2012/2013) to study the effect of size strip of water harvesting (catchment): cultivated area and (mineral nitrogen and biofertilization) on yield, yield components and water use efficiency (WUE) of barley. Results indicated that, yield and yield attributes of barley i.e. number of spike/m 2 , 1000 grain weight (g), biological yield (kg/fed.), grain yield (kg/fed.) straw yield (kg/fed.) and harvest index were significantly increased with increasing the ratio of catchment area to cultivated area as compared with control (without leaving catchment area) and by increasing mineral nitrogen fertilizer up to 20 kg N/fed. with biofertilization inoculation, but number of tillires/m 2 significantly increased with increasing the ratio of catchment area to cultivated area only in the second season and by increasing mineral nitrogen fertilizer up to 20 kg N/fed. with biofertilization inoculation in the first and second season. Moreover, the water use efficiency (kg/m 3 ) for grain yield was significantly increased in the applied water harvesting and mineral nitrogen fertilizer with biofertilization inoculation treatments as compared with the control. From the economical point of view, the optimum treatment in terms of increasing barley yield potential under rainfall conditions was the ratio of 4:1 (four times of cultivated area) and the high dose of mineral nitrogen with biofertilization inoculation (20 kg N/fed. with microbein) at Wadi Hashim, Raas El-Hekma Region.