An experiment was conducted in Bihar Agricultural University, at Nalanda College of Horticulture, Noorsarai, during Rabi season 2016, to evaluate the effect of complementary and sole applications of organic and inorganic fertilizers on the growth and yield of rabi onion. The soil of the experimental plot had 7.47 pH, 0.21 EC and 0.62 % organic carbon with 262, 14.60 and 142 kg ha-1 available N, P and K respectively. There were seven different organic and inorganic sources viz., T1-inorganic fertilizer (IF) 120:60:40; T2-50 %NPK through IF+50 % N through FYM; T3-50 % N through FYM+50 % N through VC; T4- 1/3 of N each through FYM + VC + Neemcake; T5-50% N through FYM + PSB + Azotobactor; T6-T3+PSB + Azotobactor and T7-T4+PSB + Azotobactor have been taken for study. The experiment was conducted in randomized block design (RBD) with three replications. Results showed that plant height differed significantly due to different treatments at 30 and 60 DAT. At both the stages, 100% inorganic fertilizer (T1) recorded significantly highest plant height followed by T2 and T6. Number of leaves didn’t differ significantly during early stage of crop growth but during later stage (60 DAT) it differed significantly and recorded highest in T1 followed by T2 T3 and T6. Equatorial diameter of the bulb didn’t differ significantly and found similar in T1, T2 and T6. Bulb yield differed significantly and found highest in T1 (245.3 q ha-1) which was at par with T2 (229.7 q ha-1) and T6 (200.3 q ha-1). Gross and net return, didn’t differ significantly but recorded maximum in T1 followed by T2 and T6. Although, B: C ration differed significantly and found highest in T1 (3.5). It may be due to low input cost and high yield. On the basis result obtained T2 as 50 %NPK through fertilizer+50 %N through FYM can be adapted as sustainable crop production being at par with 100% inorganic fertilizer sources.

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