الفهرس 
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Abstract
This study was carried out during two seasons of 2014, 2015 on Washington navel orange (Citrus sinensis L. Osbeck) cultivated in a commercial orchard located in Shiwah Village near Aga city, Dakahleia governorate, Egypt. Trees were about 25 years old, spaced at 5x5 meters apart, budded on sour orange rootstock. Seventy-two trees were chosen for the present study .The experiment was arranged in a complete randomized block design with nine treatments replicated four times and each treatments and each replicate to study the effect of organic fertilization such as humic and fulvic acid as a soil application on Vegetative growth, fruit set, dropping and yield of Washington navel orange The obtained result which presented the effect of humic and fulvic acid on Washington Navel orange trees could be summarized as follow: The trees treated with humic or fulvic acid each alone or together improved the vegetative growth and fruit set percentage. It reduced the preharvest DROP increased yield and number of fruits/tree especially at the rate of (humic acid at 60 ml plus fulvic acid at 100 ml). Adding humic or fulvic acid gave non pronounced effect on soluble solids content , total acidity and SSC/acid ratio in fruit juice but gave a some increment in Vit C than the other treatments or the control.