Three pot experiments were carried out at a private farm in Abu Homos, El-Beheira Governorate during 2018 and 2019 and 2020 growing seasons to examine the role of Glutathione, Selenium, and Humic Acid solely in the first two seasons and in combinations in the third season in elevation the impact of salinity on vegetative growth (leaves fresh weight, leaves dry weight and leaf area), chemical composition (chlorophyll, N, P, Ca, K, Na, Proline contents, K/Na ratio) and yield of sweet pepper cultivar "Madrid". The results illustrated that the growth parameters, chemical composition and yield of sweet pepper decreased by increasing salinity level. The results of the mitigation treatments of Glutathione, Selenium, and Humic acid, showed that the application of either Selenium alone in the first two seasons or combined with Glutathione in the third season showed significant effects for increasing plant growth, nutrient contents and yield under the highest salinity level.
Two field experiments were conducted during the summer seasons of 2016 and 2017 at the Experimental Station Farm; South El-Tahrir; Horticultural Research Station, El-Behiera Governorate. This investigation aimed to study the effect of bio-fertilizer potassien(Bacillus circulance)in combination with different rates of mineral potassium fertilizer (0,32,64 and 96kgK2O/fed) on the growth, yield and quality characters of potato CV. Spunta. Potassium fertilizer at 64 or 96 kgK2O/fed with application of bio-K fertilizer promoted growth of potato and the highest mean value of plant height, number of leaves plant-1 , foliage fresh weight, leaves fresh weight, foliage dry weight, leaves dry weight , total chlorophyll and enhanced N, P and K uptake, as well as increased tuber weight ton/fed, average tuber weight and improved tubers quality characters expressed as dry matter, protein, starch, and total carbohydrates contents and specific gravity in the two seasons. It could be concluded that the interaction effect of inoculation potato tuber seeds with bio fertilizer at application of 67% (64 kg K2O/fed) of the recommended K level (96 kg K2O fed-1) increased the productivity of potato tuber and improved tuber quality characteristics, as the same as (96 kg K2Ofed-1). In addition to saving about 33% of potato requirement of K fertilizers and avoid environmental pollution hazards caused by excessive application of chemical fertilizers.
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