الفهرس 
IntroductiionOnly 14 pages are availabe for public view
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Abstract
Objectives: - Investigate the effect of foliar spraying a growth regulator (GA3) and a nitrogen source (urea) as well as pinching the early flowering in winter in the mango cultivar ”Zebda”. Methods & Results: 1- The present investigation was carried out during the three consecutive seasons of 2006-2007, 2007-2008 and 2008-2009 on mature ”Zebda” mango trees (Mangifera indica L.) grown in the experimental orchard of El-Kassassin Hort. Research Station, Ismailia Governorate. The trees were 20 years old at the beginning of the study, budded on ”Sucary” rootstock spaced at 7m apart grown in sandy soil under drip irrigation system. 2- GA3 or urea application each alone or with pinching reduced the percent of malformation / tree than pinching alone or trees left without treatments. Also trees sprayed with GA3 resulted in reduced percent of malformation than those sprayed with urea. The data also reveal that pinching alone gave a higher percent of malformation than the other treatments or the control. 3- All treatments increased the number of fruit set, during the three seasons than the control. Moreover, trees sprayed with GA3 at 100 ppm with pinching gave the highest number of fruit set than the other treatments used or the control. Conclusion: - Under similar conditions of the present study, it is recommended to spray mango trees of ”Zebda” cv. with GA3 at 100 ppm one time in mid-November as well as pinching early produces inflorescences that emerge during the warm winters. This practice resulted in significant increase in number of set fruits, and total harvested fruits/tree. Moreover, such treatment reduces malformation and can delay panicles flowering and enhance the vegetative growth of mango trees. Shoot length increases with more number of leaves/shoot. As such the obtained results are of practical importance especially with the increase in temperature global were and short within and two such tropics.