Effect of growth regulators on bearing and quality of Amrapali mango.
Birendra Prasad, Mandal B. K., Ray R. N.
Author Affiliation: Department of Horticulture, Birsa Agricultural University, Ranchi, Jharkhand, India.
Annals of Plant Physiology 25 : 99-105
Abstract : The present experimentation was conducted at Department Horticulture, Birsa Agricultural University, Ranchi to investigate the effect and efficacy of different concentrations of plant growth regulators i.e. NAA, 2-4D, 2-4-5D and GA3 on bearing and quality of Amrapali mango in two fruiting seasons 2006-2008 in RBD. It was observed that the highest percentage of flowering shoot (85.60, 87.30 & 87.30 percent), maximum length and breadth of panicle (30.52×15.72 cm, 30.80×16.14 cm and 30.66×15.92 cm), minimum number of staminate flowers (805.65, 846.30 and 825.98) and maximum number of hermaphrodite flower (310.20, 368.40 and 339.30) per panicle produced fruit per tree by treatment NAA 200 ppm where as minimum flowering intensity and maximum staminate flower as well as minimum hermaphrodite flower were in control. Furthermore applying of GA3 100 ppm was most effective in retaining the maximum fruit percentage per panicle (3.70%) in first year whereas in the following year it was 3.94 percent under NAA 20 ppm. Similarly, maximum increase in fruit size and fruit weight also observed under GA3 100 ppm whereas minimum in control. Data in respect of economics of spraying indicated that NAA 20 ppm proved to be the best treatment in respect of net profit.