الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The present investigation was carried out during the two successive growing seasons of 2013 and 2014 on seven years old ”Washington Navel’’ orange trees (Citrus sinensis) budded on Volkamer lemon grown at El-Nubaria city, Beheira Governorate to evaluate the effect of different kinds of fertilizers on soil properties, vegetative growth, yield and fruit quality under different irrigation levels in sandy soil. The results showed that the use of moderate irrigation (2919.34 - 3157.88 m3/fed/year) and the fertilization program/tree/year (33.33% mineral NPK + 33.33% organic NPK + 33.33% mixed mineral ore + bio-fertilizer NPK) was the most profitable treatment followed by 50% organic NPK + 50% mixed mineral ore + bio-fertilizers NPK. Both two treatments are recommended for orange farmers to saving about 25% of irrigation water with significant improvements in soil properties, growth, yield and fruit quality with increasing water use efficiency (kg/m3), and crop value with appropriate benefit/fed. from ”Washington Navel” orange trees.