Fruit Set and Yield Enhancement in Tomato (Lycopersicon esculentum Mill.) Using Gibberellic Acid and 2,4-Dichlorophenoxy Acetic Acid Spray

초록

High temperature stress in summer season at plastic house is a limiting factor for tomato fruit set andyield. This study was performed to assess the effects of gibberellic acid (GA3) and 2,4-Dichlophenoxy acetic acid(2,4-D) spray on fruit set, yield, and quality of tomato cv. ‘Adoration’(Enza Zaden Co., Ltd.) under the plastic housein Hwacheon, 2011. Four concentrations (0-, 5-, 10- and 15mg·L−1) of GA3, and three concentrations (0-, 5- and10mg·L−1) 2,4-D were sprayed in early flowering of tomato in the plastic house, and fruit set, yield and quality characterswere observed. The results showed that spray of 10mg·L−1 GA3 significantly increased the fruit set by 14.2%than unsprayed. The spray of GA3 significantly increased the marketable fruit number, fruit weight, and yield. Thespray of 2,4-D on blossoms significantly affected the fruit set percentage, fruit weight, marketable fruit weight andyield, and the highest fruit set observed as 62.5% in combined spray of GA3 and 2,4-D at each 5mg·L−1. Fruit sizeand total soluble solids significantly varied with the concentrations of GA3 sprayed. The result indicates that thespray of 10mg·L−1 GA3 and 5mg·L−1 2,4-D can be more economic and effective to increase the fruit set, and yield intomato under high temperature condition in plastic house.

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