الفهرس 
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Abstract
The present investigation was undertaken throughout the two successive seasons of 2016 and 2017 at fruit orchard, Faculty of Agriculture at Moshtohor, Benha University, Toukh region, Qalyubeia Governorate, Egypt. br The main goal of such study is the evaluation of two stimulating substances i.e., (yeast extract and nano fertilizers) at different concentrations and two irrigation levels on some vegetative growth measurements, fruiting parameters and fruit properties as well as leaf nutritional status of Washington navel orange trees budded on sour orange rootstock. Trees under study were fifty eight year-old, grown in a clay loamy soil and planted at 5 meters apart under flood irrigation system. Results indicated that, the two investigated stimulating substances and their combinations as foliar spray associated with high level irrigation resulted in a positive and significant increase in most vegetative growth measurements and an increment in fruit set percentage as well as yield as Kg/ tree. Furthermore, fruit -#68;-#82;-#79;-#80;