الفهرس 
Effect of some pre-harvest treatmentsOnly 14 pages are availabe for public view
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Abstract
This study was carried out during two successive seasons of 2006 and 2007 on Manfaloty
and Sukkary pomegranates (Punica granatum L.). Fruits were obtained from a private orchard,
located at El-beheira Governorate, Egypt.
The aim of this study was to evaluate the influence of some pre-harvest and post-harvest
treatments on the fruit quality and storability of pomegranates.
The trees were sprayed with GA3 at 100 ppm or boric acid at 0.2% or potassium ortho di
phosphat (KH2PO4) at 2% in the pre harvest experiment, and the harvested fruits were treated
with wax or hot water at 50ºC for two minutes in the post harvest experiment. In both
experiments, all fruits were harvested at maturity stage and stored at 5±1°C or 8±1°C or 10±1°C
and 90% RH. Samples of fruits of all treatments were taken at harvest date and after 4 weeks
intervals of cold storage up to the 20 weeks to be examined for different physical and chemical
characteristics as well as shelf life period.
The results of this study could be summarized as follows:-
I- Pre- harvest experiment:-
· Effect of some pre-harvest treatments on splitting, yield, physical and chemical
properties of Manfaloty and Sukkary pomegranates:-
1- Spraying Manfaloty and Sukkary pomegranate trees with GA3 at 100 ppm twice after 2
week and 8 week from full bloom significantly decreased fruit splitting% and seemed to
prevent it completely.
2- Manfaloty trees treated with GA3 at 100 ppm or boric acid at 0.2% twice after 2 and 8
weeks from full bloom showed significant increase in yield than other treatments in both
seasons. On the other hand, spraying Sukkary trees with either KH2PO4 at 2% or boric
acid at 0.2% considerably increased the yield in one season.
3- Both GA3 or KH2PO4 sprays increased seed color of Manfaloty cv. than other ones in the
first season only. whereas, all the studied pre harvest treatments significantly increased
seed color of Sukkary cv. in the first season.
4- No significant differences between all treatments in the seed lightness of Manfaloty cv.
But Sukkary trees treated with GA3 recorded the highest value of seed lightness.
5- Fruits collected from trees treated with KH2PO4 or boric acid exhibited the highest rind
color density in both cvs. The same result was obtained for rind lightness.
6- GA3 or boric acid sprays increased fruit weight, fruit volume , seed weight , juice weight
and rind weight, than other treatments, while, fruit length, diameter, shape and juice %
did not respond to all the treatments in Manfaloty pomegranates. In Sukkary cv., spraying
trees with boric acid at 0.2% significantly increased fruit weight, fruit volume, see.