Onion (Allium cepa) is one of the commercial bulb crops cultivated throughout India. Onion has huge demand for its edible bulb and the productivity is to be increased. An experiment was conducted to investigate the influence of growth promoters and micronutrients in bulb yield of onion cv. Bhima Shakti during 2021-22 at experimental block of College of Horticulture, Mudigere under hilly conditions. The experiment was laid out in Randomised block design with eleven treatments and three replications. The treatments consist of growth promoters (GA3 and NAA) applied at 75 ppm, 100 ppm, 125 ppm and micronutrients (ZnSO4 and Boron) applied at 0.25% and 0.50%. Growth promoters and micronutrients made a significant impact on growth and bulb yield of onion. The obtained results showed that plant height (74.52 cm) was significantly higher in T6-GA3@125 ppm at 105 days after transplanting (DAT). Maximum leaf girth (3.23 cm) at 105 DAT, days for maturity (125 days), bulb yield (34.50t/ha) and bulb volume (96.35 cc) were recorded significantly in T5-GA3@100 ppm. The application of gibberellic acid at the concentration of 100 ppm was effective for obtaining higher bulb yield.
