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EFFECT OF NITROGEN AND GA 3 ON GROWTH, YIELD AND FRUIT QUALITY OF CHINESE MANDARIN TREES

: This study was conducted to evaluate the effect of three rates of nitrogen fertilization as control (500), 750 and 1000 g N/tree/year and GA 3 at 10 and 20 ppm, alone or in combinations on vegetative growth, yield and fruit quality of Chinese mandarin trees. Results showed that, high nitrogen level (1000 g N/tree) with 10 or 20 ppm GA 3 enhanced vegetative growth parameters in terms of shoot length, leaves number/shoot and leaf area of Chinese mandarin trees in both seasons. Moreover, treatment of 1000 g N + 10 or 20 ppm GA 3 gave the best fruit set % and showed to be the superior one in reducing fruit drop and preharvest fruit drop percentages as compared to control treatment. Yield and fruit quality were significantly increased by all treatments of nitrogen and GA 3 compared to control treatment in both seasons. Therefore, it is recommended with the treatment of 1000 g N/tree plus spray with GA 3 at 10 or 20 ppm which gave the best growth, yield, fruit quality of Chinese mandarin trees under sandy soil conditions.