The research work was carried out at the Botanical Garden Field of Rajshahi University, Bangladesh in 2004-05 growing season to study the effect of nitrogen and potassium levels on yield and quality seed production of onion. Two different factors were considered, factor: (A) Nitrogen level (0, 50, 100, 150) kg/ha, (B) Potassium level (0, 40, 80, 120) kg/ha. The experiment consisting of 16 treatments combination was laid out in randomized complete block design (RCBD) with three replications. The

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... results showed that plant height, tillers, flowers, seeded fruit, fruit set, days to bloomings, seed yield and germination percentage were significantly influenced by different treatments. The yield of seed increased with increased levels of different treatment combination. The treatment combination at a level NK (150´120 kg/ha) produced the maximum yield of seed per hectare (515.42 kg /ha) followed by 100 kg N/ha with 120kg/ha, 150kg N/ha with 40, 80 kg K/ha respectively, which were significantly different form all other treatment combinations. The results suggested that nitrogen 150 kg/ha with potassium 80-120 kg/ha produced more effective flowering stalks and showed better performance on seed yield and quality of onion.