Effect of exogenous growth regulators application on June fruit drop and fruit quality in Citrus sinensis cv. Blood red.

摘要

Two plant growth regulators, namely gibberellic acid and 2,4-D, were exogenously applied individually in different concentrations and the effect of their combinations on sweet orange cv. Blood Red trees two months after fruit set was observed in Pakistan. The June fruit drop and the different fruit quality parameters were studied to evaluate the optimum concentration of the growth regulators. Fruit drop was not significant among the treatments with a range of 10.87-33.82%. The fruit diameter and seed health were not affected by the treatments. The fruit weight was decreased by most of the treatments compared with the control (water). The juice quantity, total soluble solids, total and reducing sugars were improved by most of the treatments compared with the control; on the other hand, the acidity and vitamin C were not significantly affected by the treatments. The effects of both growth regulators on peel thickness, peel, and pulp were determined.