BIO-STIMULANTS INFLUENCE ON GROWTH AND YIELD OF AGGREGATUM ONIONH. Ragulraj, S. Srivignesh, K. Ramakrishna and A. Ramesh Kumar
Onion, being an edible vegetable crop, inclusion of any organic inputs without chemical usage in enhancing yield is booming strategy in view of consumer health. Accordingly, different bio-stimulants were tested to determine the influence on the growth and yield of aggregatum onion var. CO 4. The experiment consisted foliar spray of 0.1 percent seaweed extract (T1), 0.2 percent seaweed extract (T2), 0.3 percent seaweed extract (T3), 0.1 percent humic acid (T4), 0.2 percent humic acid (T5), 0.3 percent humic acid (T6), 0.1 percent fish amino acid (T7), 0.15 percent fish amino acid (T8), 0.20 percent fish amino acid (T9) and control (T10). Foliar spraying was performed three times at a 15-day interval at 30, 45 and 60 days after bulb sowing. The experiment was laid out in Randmized Block Design with three replications. At the 45th and 60th days, observations on growth and yield characteristics were made. The testing findings indicated that humic acid at a concentration of 0.3 percent produced the highest plant height (41.3 cm), neck thickness (1.067 cm), and dry matter (1.20g). Humic acid 0.3 percent had the highest average bulb weight (33.25g) and total yield (14.41 tonnes/ha). Seaweed extract at 0.3 percent had the second-best results in terms of plant height (38.30 cm), average bulb weight (29.00g), and bulb production (12.57 t/ha), but it outperformed fish amino acid and the control. The overall performance of several biostimulants shows that humic acid @ 0.3 percent foliar spray effectively enhances various growth parameters of aggregatum onion var. CO 4, resulting in increased yield.