Two field experiments, were conducted at Agricultural Research Farm, Agronomy Department, Faculty of Agriculture, AL-Azhar Univ. Madenit Nasser during 2013 and 2015 summer seasons to study the influence of irrigation regimes (40% ,60% and 80% depletion of field capacity) ,sowing dates(20 th of April , 20 th of May and 20 th of June) as well as nitrogen fertilizer rates (80,100and 120 kg N/fad.) on the yield and yield components of pearl millet, (Shandaweil 1 var.). The results revealed that, irrigation at 40% depletion of field capacity awarded the highest significant means for plant height, fresh and dry weight/plant and fresh and dry forage yield / fad. in both growing seasons. In both growing seasons, the first sowing date (20 th April) was the most significant one due to the previous parameters. The highest means of the above mentioned characters were obtained by 120 kg N/fad.. As for interactions. irrigation at 40 % depletion of field capacity during the first sowing date (20 th April) awarded the heaviest plants , while the two sowing dates (20 th April and 20 th May) Also , the application of 120 kg N/fad. gave the best results for the most characters under study.

to investigate the impact of three levels of applied irrigation water: I 1 =100, I 2 =80 and I 3 =60% of irrigation water requirements (IR) and foliar application of potassium selenate (K 2 SeO 4 : 0.3 and 0.6 mM) and potassium silicate (K 2 SiO 3 : 5 and 10 mM) on the growth, yield and quality of faba bean (Vicia faba L., cv Sakha 3) and also the water use efficiency. The results indicated that increasing the applied irrigation water amount from 2219.75 (I 3 ) to 3698.77 m 3 ha -1 (I1) gave the highest mean values of plant height, number of branches (NB), dry seeds weight, the weight of 100 dry seeds and dry seed yield as well as P and K content in seeds. On the contrary, the highest mean values of water use efficiency (WUE), protein and nitrogen (N) content in seeds occurred with 60% of IR for both seasons. Moreover, foliar spraying with potassium silicate at 10 mM led to a highly significant increase of all the studied parameters followed by foliar spraying with potassium selenate at 0.6 mM compared to the untreated plant's treatment. Consequently, it is recommended to grow faba bean plants (Sakha 3) by applying 80% of IR (2958.02 m 3 ha -1 ) and foliar spraying with 10 mM potassium silicate and saving 20% of the amount of irrigation water for other uses in agriculture.

An experiment was performed during two successive winter seasons of (2018/2019-2019/2020), at a private farm in Baloza, North Sinai, Egypt, to study the effect of three levels of irrigation water salinity "SL" (1.21, 2.98 and 4.54 dS/m) and four applied irrigation water stresses "IR" (100%, 85%, 70 and 55%) under magnetic (MW) and un-magnetic (UMW) water treatment technique on marketable yield, parameters of crop quality , actual evapotranspiration (ETa), water use efficiency (WUE) and irrigation water use efficiency (IWUE) for spinach leaves by using surface drip irrigation system. The results showed that, the marketable yield and studied quality parameters of spinach leaves gave the highest values when applying treatment SL1 =1.21 dS/m and IR = 100% under MW water for both seasons. While the seasonal ETa of spinach leaves gave the lowest values of 107.91 and 105.10 mm/season for both seasons respectively, when applying treatment, SL1 = 1.21 dS/m and IR = 55% under MW. Finally, the WUE and IWUE of spinach leaves gave the highest values when applying treatment SL1 =1.21 dS/m and IR = 70% under MW. The study concluded that irrigating spinach by using magnetized water may be considered as a promising technique to improve marketable yield productivity and saving a lot of irrigation water added by using surface drip irrigation system.

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Penman-Monteith. (ii) method B is the water depletion from the soil, which depends on the water properties of soil. Crop water needs, yield, water use efficiency and the irrigation water amount lost by deep percolation were determined. The results showed that the irrigation method dependent on the soil water properties has positive effects on the squash production compared to method A. Moreover, the highest value of water use efficiency was obtained by method B, which was 5.31 kg m -3 , while its value for method A was 4.33 kg m -3 . Also, the highest yield was obtained by method B, which was 15970.10 kg ha -1 , while the productivity under method A was 15492.69 kg ha -1 . In addition, the highest values of lost water through deep percolation (14.82 %) were detected with method A. Generally, method of irrigation soil-based was more accurate in calculating the amount of irrigation water added and had clearly positive effects on growth, yield and water use efficiency of squash compared to a climate-dependent irrigation method.