الفهرس 
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Abstract
The present investigation provides a detailed description of ecological features and phytochemical analyses, morpho-physiological traits, anatomical features and ultrastructure characteristics as well as biochemical aspects of yielded grains of three species of genus Echinochloa (E. colona, E. crus-galli and E. stagnina) were collected from different habitats in North Nile Delta of Egypt. The environmental factors prevailing in the habitats supporting theses selected species were studied to clarify the range of environmental factors with which they can live and grow. The natural vegetation was analyzed to demonstrate their abundance in relation to other associated species. Phytochemically, the mean values of moisture, ash, dry matter, crude protein, crude fiber, crude fat, total nitrogen, carbohydrates content, total digestable nutrients, nutritive value, elementary analysis and secondary metabolites such as tannins, flavonoids, alkaloids, total phenols and saponins were determined. Results obtained in the present investigation showed that reduction of growth and productivity of genus Echinochloa plants by salinity differs between species due to variability of salt tolerance and also changes that occur in the plant’s physiological functions and biochemical composition as a result of increased salinity as well as flooding of the plant’s environment.
Key Words : (not more than Ten)
Nile Delta region; vegetation ; classification ; ordination ; genus Echinochloa ; phytochemical analyses ; morpho-physiological traits ; anatomical features ; ultrastructure characteristics; productivity