Effect of Gibberellic Acid(GA3) on Fruit Set and Development of Commercial Variety Tomato (Lycopersicon esculentum Mill) Grown in Summer under Pot Condition

Abstract

This research aimed to carify the effect of spraying gibberellic acid (GA₃) at different concentrations at anthesis stages on fruit setting and fruit development of F₁-hybrid tomato cv Ranger grown in pot under summer condition. The experiment was arranged under growing house which was covered by white nylon screen and was replicated 5 times. The first factor was stage of GA₃ spraying (0, 2 and 4 day after fullbloom, DAFB) and the second factor was concentration of GA₃ (0, 50, 100 and 200 mg/l). It was conducted at the Faculty of Agriculture and Agricultural Industry, Surindra Rajabhat University during February to June, 2017. Results showed that spraying 100 mg/l GA₃ at 0 DAFB significantly affected the highest mean of fruit fresh weight per fruit (52.39 g) and pulp thickness (0.67 cm),        as spraying of 200 mg/l GA₃  at 0 DAFB (0.68 cm), 0 mg/l GA₃ (0.73 cm) and 100 mg/l GA₃ (0.70 cm)        at 4 DAFB showed insignificantly affected pulp thickness. However, spraying of 0 mg/l GA₃ at 0 DAFB significantly affected endocarp+placenta+seeds fresh weight (9.37 g). Pulp fresh weight (23.81 g) and fruit fresh weight per inflorescence (32.64 g) were affected by spraying of 100 mg/l GA₃ at 4 DAFB. Fruits number per inflorescence showed no interaction between stage of spraying and concentration. Spraying of GA₃ at any concentration was significantly enhanced fruit number per inflorescence at 2 DAFB (1.79 fruit). Mooreover, it was found out that spraying of 50 mg/l GA₃ (1.79 fruit) and 100 mg/l GA₃ (1.72 fruit) showed significantly increased fruit number per inflorescence over the rest concentrations.