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Two field experiments were carried out at a private farm at Manchat Nabhan, Fakose, Sharkia Governorate, Egypt during 2017/18 and 2018/19 winter seasons. The study aimed to find out the effect of five exogenous application levels of AsA and H 2 O 2 (S0: without, S1:100 ppm AsA, S2: 200ppm AsA, S3: 30mM H 2 O 2 and S4: 60mM H 2 O 2 ) on wheat (Triticum asetivum, L. cv.Misr 1) under three treatments of irrigation water (4, 5 and 6 irrigations) using surface irrigation system. A randomized complete block split plot design with three replicates was used in each season. The irrigation treatments and the levels of AsA and H 2 O 2 were randomly allocated in the main and sub-plots, respectively. The most important findings could be summarized as follows: At 105 days from planting, wheat plants under water stress (irrigation four times) without AsA and H 2 O 2 application showed a significant decrease in leaf area index (LAI), relative water content (RWC %) and total chlorophyll in comparison to wheat plants under well watered in both seasons. In general, the highest values of these traits were significantly gained from the highest concentration of ascorbic acid (200 ppm) and H 2 O 2 (60mM) in both seasons. At maturity, in both seasons, irrigations 4 times significantly resulted in lower spikes number m -2 , 1000-grain weight and grain yields than those in the plots irrigated 6 times. Generally, the maximum values of these traits were significantly obtained from the highest levels of ascorbic acid and H 2 O 2 in both seasons. Under stressed and unstressed plants, increasing AsA and H 2 O 2 levels significantly improved all these traits.

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Two field experiments were conducted during 2012 and 2013 seasons in the Experimental Farm of Agriculture Research Station, Agric. Res. Center at Ismailia, Egypt to study the effect of four levels of phosphatic fertilizer i.e., 15.5, 23.25 and 31.0 kg P 2 O 5 /fad (faddan= 4200 m2) with and without the bio fertilizers phosphorine or microbein on yield, yield components and yield quality of two peanut varieties, Giza 6 as erect cv and Gereogry as spread cv. The spread variety Gereogry surpassed significantly the erect variety Giza 6 in yield (pods, seeds and biological yield/fad), yield components (plant height, number and dry weight of pods/plant, dry weight of seeds /plant, 100-seed weight and shelling percentage) and yield quality (seed oil content% and oil and protein yield/fad. While, the two studied varieties did not differ significantly from each other in dry weight of straw/plant, fodder yield/fad and seed protein content %). Increasing phosphorus levels from 0 to 31 kg P 2 O 5 /fad increased significantly the forementioned yield, yield components and yield quality; expect the non significant effect of P levels on seed protein content %. It is worthy to note that bio fertilizers phosphorine or microbein increased the efficiency of peanut plants in utilizing phosphours fertilizer, which in turn had favourable effect on peanut productivity. The increment of yield, yield component and yield quality of peanutcvs was more pronounced and its values were higher when peanut plants fertilized with phosphorus fertilizer combined with phosphorine or microbein than fertilized with P only and the two biofertilizers did not differ significantly in this respect. P levels up to the highest level (31 kg P 2 O 5 ) with or without biofertilizers increased significantly peanut yield, yield components and yield quality, except that there was no significant difference between to two higher levels of P (23.25 and 31.0 kg P 2 O 5 /fad) in plant height, 100-seed weight, pods yield/fad, seed oil content % and protein yield/fad.