الفهرس 
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Abstract
This investigation was conducted in a private located at private farmer in Mammora
Alexandria, Governorate, Egypt, on 10-year-old sugar apple trees. The study extended for two
successive seasons (2019 and 2020). The present investigation aimed at study the effect of hand
pollination and plant growth regulators on storability, physical and chemical composition of
sugar apple fruits. This factorial experiment consisted of fourteen treatments arranged in a
Randomized Complete Block Design (RBCD) design with three replicates for each treatment.
The treatments of this experiment could be summarized as follows:
1. Control
2. Hand Pollination
3. CPPU at 2mg/ l
4. CPPU at 4mg/ l
5. CPPU at 6mg/ l
6. Brassinosteroids at 1mg/l
7. Brassinosteroids at 1.5mg/l
8. Brassinosteroids at 2mg/l
9. NAA at 25 mg/ l
10. NAA at 50 mg/ l
11. NAA at 75 mg/ l
12. GA3 50 mg/ l
13. GA3 100 mg/ l
14. GA3 150 mg/L
The result of this experiment could be summarized as follows:
5.1 Fruit set, retention and DROP percentages
• Significantly highest percentages of fruit set and fruit retention were recorded with
brassinosteroids at 2 mg/L as compared to control treatment which recorded the lowest mean
values of fruit set and fruit retention, during both seasons.
• Fruit DROP percentage was significantly increased with control treatment as compared with all
different plant growth regulators, while high concentration of NAA at 75 mg/L gave the lowest
mean values of fruit DROP percentage, during both seasons.
5.2 Yield and yield components:
• High concentration of brassinosteroids (2 mg/L) significantly increased the fruit weight as
compared with control treatment which recorded significantly decreased fruit weight, in both
seasons.
• Maximum number of fruits/ tree recorded by brassinosteroids (1.5 and 2 mg/L), as compared
with control treatment which recorded the minimum number of fruits/ tree, in both seasons.
• Higher yield/ tree were recorded with brassinosteroids at 2 mg/L, while lower yield/ tree
observed with control treatment, during both seasons.
5.3 Number ofseeds/fruit
• Hand pollination and control treatments significantly increased number of seeds/ tree, as compared
with all plant growth regulators treatments, during both seasons.