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The experiment was conducted at Agricultural Research Institute Tarnab, Peshawar, Pakistan during the year of 2017. Different concentrations of Gibberellic acid (GA3) i.e., 0, 20 and 30 ppm were sprayed at two different phenological stages i.e. at full bloom and after fruit set (80% petal fall) and the results were compared with control treatment. The experiment was laid out in two factors Randomized Complete Block Design with Split Plot arrangement having three replications. The results revealed that treatment of GA3 concentrations at different phenological stages had significant effect on the parameters having high total soluble solids (8.85), low fruit pH (4.49), maximum sugars (9.12 %), low acidity (0.18 %), high sugar: acid ratio (52.01) and high vitamin C content (5.54 mg/100g) with the application of GA3 after fruit set while, low total soluble solids (8.03), high fruit pH (4.86), minimum sugars (8.98 %), high acidity (0.21 %), low sugar: acid ratio (43.43) and high vitamin C content (5.34 mg/100g) were recorded with GA3 application at full bloom. Gibberellic acid at 30 ppm, resulted in highest total soluble solids (9.44), low fruit pH (4.03), maximum sugars (9.16 %), low acidity (0.17 %), high sugar: acid ratio (54.40) and high vitamin C (5.63 mg/100g) while, the lowest total soluble solids (7.23), high fruit pH (5.51), minimum sugars (8.88 %), high acidity (0.22 %), low sugar: acid ratio (40.41) and low vitamin C contents (5.22 mg/100g) were recorded in untreated control trees. From the current investigation it can be concluded that the treatment of GA3 at 30 ppm after fruit set found better in most of quality attributes of plum as compared to control.
Keywords: Gibberellic acid; Phenological stages; Plum; Quality