الفهرس 
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Abstract
The present study was carried out during the three successive seasons of 2003, 2004 and 2005 on desert red peach trees in el¬harameen orchard at el¬khatatba city , monifia , governorate. it aimed to study the effect of gibberellic acid, calcium chloride, potassium permanganate and camphor oil on fruit quality at harvest time and its effect on changes of desert red peach fruits at cold storage and through marketing . the applied treatments were sprayed two weeks before harvest time on 21 and 16 may at the first and second seasons respectively, when the skin ground color is yellow covering with red blushes about 98% of external surface of fruits and firmness reaches 14. 0 lb/inch2. samples from each replicate were taken to study the effect of these treatments on fruit quality at harvest time to determine the initial properties. for storage studies, all infected and damaged fruits were removed, then fruits were packed using ventilated plastic bags. all bags with fruits were weighted and every six bags were put in ventilated carton box (50×30×12)cm. the total number of boxes were 21 for all treatments, each treatment consists of 3 carton boxes, each box contains 6 ventilation plastic bags and stored at 2y+1r with 90-95 % relative humidity. * this study revealed the following results : 1¬ spraying peach fruits two weeks before harvest with camphor oil at 0. 1% is very safety, effective for reducing decayed fruits and total loss in fruit weight under cold storage and during marketing at room temperature 2¬ cacl2 at 1 % + kmno4 at 0. 1% enhanced fruit firmness, anthocyanin content and reduced loss in fruit weight. 3¬ ga3 application at 25 ppm keeping fruit firmness to a long time. 4¬ ga3 at 25 ppm + kmno4 at 0. 1% increase ssc / acid ratio in fruit juice which guide to expand marketing period of peach fruit in emporiums