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.

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 summer seasons of 2010 and 2011. These experiments aimed to study yield and its components, oil percent (%), and oil yield at planted three dates, three sunflower varieties as affected by three zinc foliar application treatments. A splitsplit plot design with four replicates was used, where sowing dates devoted to the main plots, sunflower varieties allocated in the sub plots, and zinc foliar treatments arranged in the subsub plots. The obtained results could be summarized as follows: Tenth of August planting date gave the highest values for plant height (cm.), head diameter (cm.), number of seed / head, head seed weight (g.), 100-seed weight (g.), seed yield (kg/fad.), Stover yield (kg/fad.), oil content (%) and oil yield (kg/fad.) of sunflower varieties. Sunflower variety Hy sun 333 showed superior its over Sakha 53 and Giza 102 varieties in all studied traits. Zinc foliar treatment of 0.06% as zinc sulphate treatment gave the highest values over the control (tap water) for all studied traits. The first and second order interactions had significant effects on all studied traits.

http://aasj.bu.edu.eg/index.php Response of some white Corn (Zea mays L.) hybrids to Bio-mineral fertilizer application under AL-Frafra Oasis conditions.

Field experiments were conducted in villages named Subih (F1) and , Al-Farafra Oasis, New Valley Governorate, Egypt, during the winter season 2015-2016 by cultivating the wheat crop. Two management practices were carried out: Traditional management practices (TMP) under the conventional agriculture conducted by farmers' practices and improved management practices (IMP), which adopted long narrow borders irrigation system, LASER soil surface leveling for F1was 0.15 and 0.10% with F2 as longitudinal slope, mature organic compost 0, 30 and 50 m 3 ha -1 , two water distribution technique as spill controlled pipes (SP) and perforated controlled pipes (PP), and two inflow rates produced by developed irrigation management guidance program (WinSRFR 5.1.1) which were under F1 conditions (q1) and (q2) in an average of 135 and 99 Lpm of border width, respectively, and it was 48 and 42 Lpm, respectively, under F2. Results showed that management can be optimized then irrigation water rationalized by using simulation models. TMP in F1 and F2 conditions consumed 7635 and 6952 m 3 ha -1 on average, respectively, compared with IMP, by applying q1 under F1 and F2, saving water from 12.0 to 13.6 % and from10.0 to 11.5 %, respectively, upon compost rates and water distribution techniques. Grain yields increase by IMP 22.0 to 24,3 and 24.2 to 29.6 % for q1 of F1 and F2, respectively. Irrigation water use efficiency of grain yield (IWUEg) were 0.77 and 0.79 kg m -3 in F1T and F2T, respectively, the increment percentage reached 25.0 -43.8 and 15.0 -24.1 % for q1 and q2 in IMP.