الفهرس 
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Abstract
Experiments in which Gossypium barbadense seeds were germinated and planted in sandy soil alone (control) or in sandy soil supplemented with increasing concentrations of urea, peat moss or ureaformaldehyde polymer either alone or in combination were conducted. All these experiments were designed to investigate the possible effects of using different soil conditioners in reclaiming sandy soil so as to maintain appropriate and good growth and productivity of cotton plants. The associated metabolic patterns including changes in carbohydrate, nitrogen, pigments, element composition, activities of NR and gasamylase and yield specifications (tensile strength and cellulose content of yielded cotton fibers), in cotton plants at seedling, vegetative, flowering, fruiting and yield stages were also investigated.The results are discussed in relation to the different mechanisms of action of soil conditioners on soil reclamation and to their effects upon growth, development and metabolic changes in cotton plants throughout the different stages of growth and development. Collectively, it is of interest to mention that supplemental addition of urea, peat moss and ureaformaldehyde polymer, in combination, to unreclaimed sandy soil led to the best growth and productivity of cotton plants with cotton fibers having specifications comparable to that fiber specifications produced from cotton plants grown in ideal clay soil.