الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
This investigation was conducted during the two consecutive seasons of 2015 and 2016 on thirty 15-years old Zebda mango trees onto polyembyonic mango seedling rootstock. The trees are grown in a private mango orchard located at Harbbiab island, Drao district, Aswan Governorate. The uniform in vigour trees of Zebda mango (30 trees) were planted at 5 x 5 meter apart. The soil texture of the tested orchard is silty clay with a water table depth not less than two meters. Surface irrigation system was followed.
CONCLUSION
Under the experimental and resembling conditions , it is suggested to spray Zebda mango trees twice at growth start and again just after fruit setting with Royal Jelly at 0.025% for promoting yield and fruit quality. Under such promised treatment net return per feddan when it applied in one feddan contains 160 trees reached 4600 and 7000 L.E. during 2015 and 2016 seasons, respectively.