الفهرس 
Effect of Water Stress on Water Requirements and Yield of Maize Grown in the Clay Loam Soils of Egypt and Sudan
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Abstract
This thesis aims at studying the impact of irrigation at different available soil moisture depletion under various planting dates on water requirements and yield of maize grown in the clay soils. In Egypt, to field experiments were conducted during 2019 and 2020 seasons on maize Cultivation (Single Hybrid 2031) at the Water Requirement Research Station of the Water Management and Irrigation System Research Institute, National Water Research Center, Bahteem region, El-Qalyobia Governorate, Egypt. Planting was performed in clay loam soil and flood irrigation under modified furrow irrigation system. The experimental design was arranged in a split- plot with three replications. The main plots were divided into four levels of irrigation water, i.e., irrigation at 100% of the available soil moisture (once in ten days, control), irrigation at 10% of the available soil moisture depletion (ASDM), irrigation at 20% ASDM and irrigation at 30% ASDM. The sub- sub plot were allocated to three planting dates (15-April, 15-May and 15-June). For Sudan, a literature review has been collected in order to compare the results and conclusions with those the current experimental research carried out in Egypt. The results exhibited that available soil moisture depletion possessed negative effect on the water use efficiency, which was reflected in a decrease in maize grain yield/Fed. However, there was a possibility of using irrigation regime at 10% of the available soil moisture depletion under the optimum planting date (15-May) in order to obtain results trend similar to those with 100% of the available soil moisture in terms of benefiting from the optimal use of irrigation water and increasing productivity.