Effects of gibberellic acid on fruit growth and fruit development of mangosteen (Garcinia mangostana Linn.)

Abstract

The different concentrations of gibberelic acid (GA₃) applied by spraying on the 15-year-old magosteen trees during the full bloom and fruit setting stage. The study was conducted at the Chumphon Research and Training Centre, Faculty of Agriculture, Rajamangala University of Technology Srivijaya, Chumphon province from Mach, 2009 to Mach, 2010. The experiment was used the Completely Randomized Design (CRD) with 5 replications. The different GA₃ concentrations were evaluated: 0 25 50 75 and 100 ppm. The results of the study showed no significant differences among treatment means between GA₃ applied in different concentrations with control in parameter of fruit size (width and length) and fruit weight during fruit growth and fruit development at 15-45 days. After 60-120 days, the result showed differences among treatment means between GA₃ applied in different concentrations with control in parameter of fruit size (width and length) and fruit weight. Also, the different concentrations of GA₃ was affect of peel weight and aril weight. The total soluble solid (TSS) was recorded data that there is no significance found on the sweetness of fruit obtained from both treated and untreated trees.