Effect of Dose and Time of Paclobutrazol Application on Physiology of Flowering and Yield in Mango (Mangifera indica L.) Cultivar Alphonso

This experiment was conducted by Horticultural college and research institute, TNAU, Periyakulam at Pandiyan Farms, Kottur, Theni District during the year 2012–13. This trial was laid out in a Factorial Randomized Block Design with twenty treatments in two replications. Twenty year old uniform sized trees of mango cv. Alphonso spaced at 9 x 9 m were selected for this experiment. Paclobutrazol (Cultar-23 SC) was applied as a soil drench at concentrations of 0, 0.25, 0.5 and 0.75 g a.i. m⁻² of canopy diameter. The treatment was imposed at the third week of different months viz., July, August, September, October and November. The results indicated that soil drenching of paclobutrazol at 0.75 g a.i. m⁻² of canopy diameter during the month of September was effective in increasing C: N ratio, total phenols, soluble protein, number of hermaphrodite flowers panicle⁻¹, total number of flowers panicle⁻¹, and yield tree⁻¹.