Using nutrient elements and amino acids to improve plant production under saline soil conditions in Egypt and Tunisia / Amal Abdelhameed Osman Elmaghraby ; Supervised Adel Saad Elhassanin , Magdy Rizk Samak , Ahmed Mohamed Helmy Khater

Thesis (Ph.D.) - Cairo University - Faculty of African Postgraduate Studies - Department of Natural Resources

Salinity is one of the most important factors limiting agricultural crop productivity, Because it affects crop output and prevents the utilization of previously uncultivated area, soil salinity is a key barrier on food production. According to the United Nations Environment Program, 20 percent to 50 percent of the world's agricultural land (cropland) is salt-stressed. Under salinity, fertilizer management can have a significant impact on crop production. Depending on the amount of salt stress, nutrients can either increase or reduce plant tolerance to salinity, or have no impact at all.The study's aims in valve the: 1.Management of cultivated vegetable plant tomato under soil salinity conditions to find out the optimum plant production through integrated treatments (Spraying and soil application). 2.Minimizing the adverse effects of saline minimization of the soil stress. 3.Improvement of the plant production and quality under this circumstance and, therefore, increase economic return. Three experiments (Hydroponic experiment, Pot experiment and Field experiment) were carried out to see if various sprays and soil treatments may help tomato plants grow faster in salty environments.The obtained results are summarized in the following: Hydroponic experiment: The best treatments were potassium nitrate, followed by the treatment of algae extract, then treatment of Fe+K+B+Prol, then Fe+K+B+Si. Through these results, the KNO₃, Algae, Fe+K+B+Prol and Fe+K+B+Si treatments were chosen to be applied to the field experiment. Pot experiment: The best three soil application H.A, K and Algae which gave a significant increase in all the growth parameters and nutrition statues that were estimated, helped tomato plants grown in saline soil. Based on the results of the pot experiment, and since humic gave the best results, it will be applied in the field experiment with two levels and also, algae were chosen to soil addition in field experiment because the foliar potassium treatment had been previously chosen from the first experiment. Field experiment: Both spray and soil additions gave a significant promotive effect for yield parameters.Spray treatment KNO₃2 with soil treatment H.A. 2 gave the best fruits yield where, increased the yield approximately three times compared with control

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