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Abstract
I. INTRODUCTION
Egyptian cotton (Gossypium barbadense,L.)is an important cash crop for the Egyptian farmer and a vital source of raw material for Egyptian textile industry and thus plays an important role in the Egyptian economy. Its contribution to the national income is so great to the extent that we should study all the factors that affect cotton yield in order to maximize the yield per unit area.
In addition, Egyptian cotton quality gives us arelative advantage for cotton marketing world wide. Furthermore cotton seeds are the major source of Human feeding oil in Egypt. After extracting oil the residues go to cotton cake industries which is a rich source for animal feeding nutrients.
In Egypt the reduction of cotton yield is the first problem facing the cotton producers. This reducing in yield due to many factors such as water supply, biofertilization.
Irrigation has always played the greatest role in crop prduction that determines the growth availability of plant nutrients and Ultimately crop yields. Nubaria region by summer suffers from the shortage of irrigation water because of the competition between farmers especially vegitatalble and water sensitive crop producers. Cotton becomes as a good example with regard to moderate water requirements. The recommended intervals between successive irrigation’s in Egypt are about 15 days (Bisher et al 1994)..
Biofertilizers drew the attention as a partial goal atternative N fertilizer application. In addition biofertilizers have many merits i.e.supply part of plant N requirement by 25% increase the availability of nutrients reduce the environmental pollution control the vegetative growth and improve the yield potential (Ragab, 1999).
Cotton (Gossypium sp.) readily forms vesicular-arbuscular (VA) mycorrhizae with certain fungi under field conditions. However most studies demonstrating that plant growth response have been conduced primarily in futnigated or autoclaved phosphorus deficient soils (Radwan, 1987) In search nutrient poor soils growth stimulation a mycorrhizal cotton may be induced by adding a sufficient quantity of soluble phosphorus (P) to the soil.
The objectives of the present study were to examine the effect of irrigation intervals bio-fertilizer treatments blus N fertilizer levels on some cotton cultivars and their interactions on seed cotton yield, its components and fiber properties in the newly reclaimed desert land of west Nubria region.