Thesis (Ph.D.) - Cairo University - Institute of African Research and Studies - Department of Natural Resources

The present study was carried out at the experimental field in the Dr. Hazem El- Mahdy farm, Abo Ghalab area, Giza. Egypt, during two successive seasons of 2014 and 2015. The objective of this study was to compare the effect of different concentrations of leaves and roots water extract for Casuarina equisetifolia at 25, 37 and 50 % and the chemical herbicide, Gesaprim (2.5 kg/ha) on growth, yield and associated weeds of corn and compared between the Casuarina equisetifolia from Egypt and Tunisia phytochemical components by use GC-mass . All concentration of Casuarina equisetifolia leaves and roots extract treatments inhibited the weed density/m2 as compared to the control and gesaprim of corn plants. The most effective dose in the two seasons is 50% of Casuarina equisetifolia leaves and roots extract. Casuarina equisetifolia leaves and roots extract treatments at a concentration of 25 and 37% increased significantly the number of ears/5 plants and the total yield. Treatment with all concentration of Casuarina equisetifolia root extract reduced significantly the nutrient contents of nitrogen, phosphorus and potassium of corn leaves plants as compared to the control and gesaprim in both seasons. Casuarina equisetfolia water leaves and roots extracts displayed highly significant biological suppressing effect on associated seasonal weed in corn which induced a significantly increase in growth and total yield

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