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.

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Two field experiments were conducted in the summer seasons of 2020 and 2021 to study the effect of potassium fertilization (0, 40, and 80 Kg K2O fad -1 ), foliar application of NAA (0, 5 and 10 ppm), and CKs as two types (BAP and TDZ at 0, 10 and 20 ppm) on yield and quality of potato tubers c.v. "Hermes". Generally, the examined levels of each studied factor were affected significantly on all yield and tubers quality traits, in both seasons. Also, the best level of each factor was 80 Kg K2O fad -1 , 5 ppm for NAA and 10 ppm TDZ for CKs. According to the first order interaction between the pairs of three main factors, the best treatment combinations were 80 Kg K2O+5 ppm NAA, 80 Kg K2O+10 ppm TDZ, and 5 ppm NAA+ 10 ppm TDZ, in both seasons. Moreover, the second order interaction among the three studied factors was found to affect significantly all the studied characters with superiority of treatment combination of 80 Kg K2O+5 ppm NAA+10 ppm TDZ, in both seasons. The treatment combination of 80 Kg K2O+5 ppm NAA+10 ppm TDZ could be a recommended for increasing potato yield with keeping high quality of potato tubers.

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