Effect of nitrogen and off season bulb size on onion seed production

An experiment was conducted at Sukranagar, Chitwan to assess the effect of nitrogen (N) and off season bulb size on seed production of onion cv. Bemausami-1 (N-8293) during 2009/10. Five levels of nitrogen (0, 40, 80, 120 and 160 kg N/ha) as main plot factor and three bulb size ( 3 cm diameter) as sub plot factor were used as treatments and laid out in a split plot design with three replications. Plant height, number of tillers, leaves; scapes, umbels, and flowers per plant were significantly high at higher doses of nitrogen and similar results were found at the bigger sized bulb too. Seed yield was the highest (300.2 kg/ha) at 160 kg N/ha and >3 cm bulb size and the lowest (200.1 kg/ha) at 0 kg N/ha and <1 cm bulb size. B: C ratio was the highest (1.79) at 160 kg N/ha with medium sized bulb (1-3 cm) and the lowest (1.05) at 0 kg N/ha with bulb size of < 1 cm.Journal of the Institute of Agriculture and Animal Science. Vol. 33-34, 2015, Page: 41-46