الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Jerusalem artichoke (Helianthus tuberosus L.) is considered one of non-traditional vegetable crop introduced in Egypt. It is considered one of the primary sources for inulin from higher plants. Many attentions are paid to alleviate the deleterious impact of salinity stress using different materials which reflect inadequate influence on human health and terrestrial Ecosystem. The scope of the current study was to assess the effects of two safety materials; potassium humate as soil application and proline as foliar spraying on growth and productivity of Jerusalem artichoke plants cv. Balady. Therefore, two field experiments were conducted during the summer seasons of 2015 and 2016 in Demo Experimental Farm, Faculty of Agriculture, Fayoum University. The experimental layout was a split-plot system in a Randomized Complete Blocks Design with three replications. Potassium humate levels (0, 20, 40 kg fed-1) were randomly distributed in the main plots whilst, proline concentrations (0, 5, 10 mM) were allocated in the sub-plots.
Gained results displayed that soil application of potassium humate not exerted a positive effect on plant height, number of main and secondary branches, in both seasons. Potassium humate application increased number of leaves plant-1, total leaf area plant-1, leaf area leaf-1 and leaves dry weight plant-1 significantly compared to control treatment in both seasons. Whereas, proline reflected the best significant positive influences on plant height, number of main branches plant-1, number of secondary branches plant-1, number of leaves plant-1, total leaf area plant-1, leaf area per leaf-1 and leaves dry weight plant-1. Tubers weight plant-1, number of tubers plant-1, dry weight of tuber plant-1 and yield fed-1 were positively responded to either soil application of potassium humate or spraying proline. the impact of foliar application with proline on average weight of tuber was not significant in both seasons. Generally treating Jerusalem artichoke plants with potassium humate or proline gave significantly higher leaves and tubers N, P, K, total carbohydrates, total soluble sugars and proline contents in both seasons. Soil application of potassium humate levels and/or proline concentrations increased leaf chlorophyll a, b, a + b and carotenoids significantly, with addition 40 kg fed-1 potassium humate and 10 mM of proline in both years. On the other side, Leaf and tuber Na contents were, truly depressed owe to application of potassium humate or proline. In addition, the interaction of the two studied factors on leaf and tuber Na contents was intrinsic. Finally, the soil application of potassium humate at 20 and/or 40 kg fed-1 with foliar application of proline at 5 and/or 10 mM is enhancing morph of Jerusalem artichoke under newly reclaimed soil conditions of Fayoum Governorate.
Key Words: Jerusalem artichoke (Helianthus tuberosus L.), Saline soil, Potassium humate, Proline, Vegetative growth, Yield and yield components, Chemical constituents.