Field experiments were conducted at S. V. Agricultural College, Tirupati for two consecutive rabi seasons of 2005-06 and 2006-07 to study the influence of graded levels of nutrients, time of N application and weed management practices on bulb yield of onion. Yield attributes and bulb yield were highest with the higher nutrient level i. e. 120-60-50 kg N, P, K over the other nutrient levels. Time of N application did not exert any significant influence on bulb yield, economic returns and weed dynamics of onion. Among the weed management practices, hand weeding twice at 20 and 40 DAT significantly reduced the density and dry weight of weeds, resulting in improved weed control efficiency, elevated stature of yield attributes and higher bulb yield and it was comparable to other weed management practices. Higher bulb yield was realized even at lower level of nutrients with weed management practices.