Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.1999.1143.1146IslamM.K.AwalM.A.AhmedS.U.BatenM.A.4199924Influence of two set sizes viz. 1.6 and 2.44 g/set, three plant spacings viz. 20cm x 10cm, 20cm x 15cm and 20cm x 20 cm and four doses of N viz. 0, 60,120 and 180 kg/ha on the growth and bulb yield of onion was studied. Larger set produced the highest bulb yield (22.6 t/ha) over smaller one (19.9 t/ha) . Smaller set gave more number of single bulbs and took shorter growing period. The closest spacing produced the maximum number of single bulbs (31.6%) and the highest bulb yield (23.7 t/ha). N at zero level gave the highest number of single bulbs. N at 120 kg/ha produced the maximum bulb yield (28.5 t/ha), but N at 180 kg/ha gave the highest plant height and required the longest growing period. Interaction effects of all possible combinations caused significant variation on bulb yield and related components. Larger set with the closest spacing gave the highest bulb yield (25.6 t/ha). Smaller set with nitrogen at zero level produced the maximum number of single bulbs. The closest spacing with 120 N/ha gave the highest bulb yield (31.6 t/ha). Maximum bulb yield (33.7 t/ha) was recorded from the combination of larger set x closest spacing x 120 kg N/ha. Smaller set 'x closest spacing x zero level N produced the highest number of single bulbs.]]>Anonymous,1997Anonymous,1997Anonymous,1997Badaruddin, M. and M.A. Haque,1977Allium cepa).]]>Das, B.C. and K.C. Dhyani,1956Jones, H.A. and L.K. Mann,1963Lazic, B.,1975Mondal, M.F., J.L. Brewster, G.E.L. Morris and H.A. Butter,1986Allium cepa L.) effects of plant density and sowing date in field conditions.]]>Nichols, M.A. and W. Heydecker,1964Purewal, S.S. and K.S. Dargan,1962Rahim, M.A., M.A. Hakim, A. Begum and M.S. Islam,1992Riekels, J.W.,1977Rizk, T.Y., M.T. Fayed, S.M. El-Nagar and H. Fawzy,1991Allium cepa L.).]]>Shalaby, G.I., A.I. El-Muraba, N.M. Kandeel and A.A. Gamie,1991Singh, K. and S. Kumar, 1969Allium cepa L.).]]>Vachhani, M.U. and Z.G. Patel,1993Allium cepa, L.) as influenced by levels of nitrogen, phosphorus and potash under south Gujarat conditions.]]>