الفهرس 
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Abstract
The present study was conducted during the two successive seasons 2016 and 2017 on 10-year-old “Anna” apple trees (Malus domestica Borkh.), grown in a private orchard at Kafr El-Dawar region, El-Behira governorate, Egypt. Thirty nine uniform trees, free from various physiological and pathological disorders received common horticultural practices were selected for investigation. Treatments included water as the control, Putrescine at (200, 400, 600) ppm, salicylic acid at (200, 400, 600) ppm, ascorbic acid at (200, 400, 600) ppm and citric acid at (200, 400, 600) ppm were sprayed preharvest on 20 April, 15 May during 2016 and 2017 respectively.
The study treatments were arranged in a factorial experiment in randomized complete block design. Random fruit samples were collected from each tree in 10, 13 June 2016 and 2017 respectively, and then divided into two groups, the first to monitor physical and chemical characteristics at harvest. Meanwhile, the second group fruits were placed into fiberboard boxes with vented plastic liners and stored for 60 days at 2o C in air (85-95% relative humidity).
Research objectives could be summarized as follow:
1- To reduce pre-harvest abscission of fruits under field conditions.
2- To enhance fruit quality by apple consumers while mitigating the adverse effects on flesh firmness or storability under commercial conditions.
3- To provide apple growers with a production system applicable, economic, feasible and achieve the tough requirements of more nutritive fruit with greater antioxidants content and a crispy-desired texture of apples.