The present investigation was carried out during the two successive years of 2006 and 2007 on "Costata" persimmon trees in order to study the influence of foliar sprays of different chemicals on the fruit retention, fruit quality and yield.Trees were sprayed at pea stage (5mm fruitlet diameter), marble stage (15mm fruitlet diameter) or at both stages with urea, phosphoric acid, potassium nitrate, Ca-EDTA, Fe-EDTA + Zn-EDTA + Boric acid , NAA, GA 4 , Amcotone, activated dry yeast and a mixture of ascorbic plus citric acids. All sprayed chemicals significantly increased vegetative growth, fruit retention, tree yield in both seasons . GA 4 had the highest fruit retention and yield followed by Amcotone and activated dry yeast and then NAA as compared with all other treatments in both seasons. All sprayed compounds increased fruit weight ,TSS, total sugars, reducing sugars, carotene and V.C contents and decreased fruit acidity and tannin contents as compared with all other treatments in both seasons. GA 4 had the highest fruit weight, followed by activated dry yeast and mixture of ascorbic acid + citric acid and then Amcotone. Phosphoric acid recorded the highest values of fruit TSS, total sugars, reducing sugars and carotene contents, whereas activated dry yeast gave the highest V.C and lower tannine contents as compared with all other chemicals in both seasons. Foliar sprays at pea + marble stages recorded the highest values of all the investigated parameters in both seasons as compared with pea or marble stage.

The present investigation was carried out during the two successive growing seasons of 2003 and 2004 on Washington Navel orange trees grown at El-Tarh region, El-Behera Governorate, in order to study the effect of spraying orange trees with different agrochemicals on fruit quality. For the present study, 96 trees were selected as uniform as possible and divided into two groups. The first group was subjected to the foliage treatments when the fruit reached pea size (5mm in diameter) and the second at marble size (15mm in diameter). Fruit weight was significantly increased in both seasons by spraying 2,4-D + boric acid at the pea or marble stages. In addition, spraying 2,4-D + boric acid at the marble stage only increased fruit length .Vitamin C content was not affected by all sprays at the pea stage, whereas it was significantly increased in the first season by spraying 2,4-D, 2,4-D + calcium chloride, 2,4-D+ calcium acetate, urea or boric acid alone at the marble stage. In the second season, fruit acidity was increased by spraying boric acid at both pea and marble stage, whereas, it was decreased by spraying 2,4-D + calcium chloride (pea stage) and 2,4-D + boric acid (marble stage). Spraying 2,4-D + calcium super phosphate at pea or marble stage significantly increased TSS percent. In addition, all treatments enhanced fruit color in both pea and marble stages over the control, especially, treatments that included foliar spray of 2,4-D. In general, most 2,4-D sprays combined with other compounds had significant influence on fruit quality characteristics.