Effect of growth regulators and their concentration on fruiting yield, size and quality of mango cv Langra.
Singh V. R., Mandal B. K., Singh C.
Author Affiliation: Birsa Agricultural University, Ranchi 834 006, India.
Environment and Ecology 29 : 306-309
Abstract : Experiment was conducted to study the effect of foliar spray of gibbrellin (20, 30 and 40 ppm), 2, 4-D (10, 15 and 20 ppm) and NAA (5, 10 and 15 ppm) alone on mango Cv Langra tree. Spraying of chemicals were applied at fortnightly interval starting from 15 September to 15 April during the investigation. Among different chemicals, NAA 10 ppm was found significantly effective in enhancing the growth of new shoot (29.66 sq/m), number of leaves (32.66) and flower (1,490) per shoot over control. Fruit set was responded to maximum in tree sprayed with NAA 10 ppm followed by NAA 15 ppm and 2, 4-D at 15 ppm. The fruit size (106.33×77 mm), fruit weight (201.66 g), pulp content (77.15%) and yield (20.98 kg and 102.33) were significantly higher with NAA (10 ppm) applied in comparison to other treatments. The TSS/acid ratio was significantly higher with NAA (10 ppm) applied while the highest ascorbic acid content in fruit (31.65 mg) was recorded in NAA (15 ppm) followed by 2,4-D (15 ppm).