Effect of Paclobutrazol and NAA Application on Yield Attributing Characters of Jamun (Syzygium cuminii Skeels.)

Jamun (Syzygium cuminii Skeels.) is the medicinally important indigenous fruit tree of India belongs to the Myrtaceae family. The antidiabietic properties of Jamun brought higher market demand which stimulates to increase the fruit production and also brought the off season concept for commercial exploitation by paclobutrazol application. An investigation was carried out to study the effect of paclobutrazol and NAA application on yield attributing characters of nine years old jamun trees during 2017-18. The various treatment combinations are paclobutrazol (PBZ - 0, 0.50, 1.0 and 1.5 g a.i. m-1 of canopy diameter) and foliar spray of NAA (0, 50 ppm, 75 ppm and 100 ppm) application at different concentrations. The experiment results revealed that fruit length (2.87 cm), pulp – seed ratio (6.54), fruit weight (14.05 g), fruit retention (65.04 per cent) and yield (68.31 kg tree-1) were observed higher in the treatment combination of PBZ 1.0 g a.i. application with 75 ppm of NAA followed by PBZ 1.5 g a.i. application with 100 ppm of NAA and the lower values were registered in control. Jamun trees treated with paclobutrazol and NAA aided in early induction of enhanced flowering and yield attributing characters.