A B S T R A C T Garlic contains 0-1% volatile oil, whose chief constituents are diallyldisulphide (60%), allyl alcohol (5.4%), dimethyl trisulphide (2-4%), methyl allyl trisulphide (1.5%), methyl allyl disulphide (1.2%) and diallyltrisulphide (1%) An investigation on the project entitled "Effect of bio-fertilizers on growth behaviour and quality parameters of garlic (Allium sativum Linn.)" was taken up in the horticultural garden of Janta College, Bakewar, Etawah, U.P. which falls under

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... ical climatic region during 2011-12 to work out the optimum dose of the three bio-fertilizer and their combination on garlic variety-G1. Fourteen treatments namely, a control receiving FYM as basal dose @ 20 ton/ha + RDF (100:50:50) (T 0 ), Azotobacter 6 kg/ha (T 1 ), Azotobacter 8 kg/ha (T 2 ), PSB 6 kg/ha (T 3 ), PSB 8 kg/ha (T 4 ), VAM 6 kg/ha (T 5 ), VAM 8 kg/ha (T 6 ), Azotobacter 6 kg/ha+ PSB 6 kg/ha+ VAM 6 kg/ha (T 7 ), Azotobacter 6 kg/ha+ PSB 8 kg/ha+ VAM 8 kg/ha (T 8 ), Azotobacter 6 kg/ha+ PSB 6 kg/ha+ VAM 8 kg/ha (T 9 ), Azotobacter 6 kg/ha+ PSB 8 kg/ha+ VAM 6 kg/ha (T 10 ), Azotobacter 8 kg/ha+ PSB 6 kg/ha+ VAM 6 kg/ha (T 11 ), Azotobacter 8 kg/ha+ PSB 8 kg/ha+ VAM 8 kg/ha (T 12 ), Azotobacter 8 kg/ha+ PSB 6 kg/ha+ VAM 8 kg/ha (T 13 ), Azotobacter 8 kg/ha+ PSB 8 kg/ha+ VAM 6 kg/ha (T 14 ) applied into soil prior to transplanting of seed cloves. The experiment was carried out in Randomized Block Design with 3 replications having plot size 3 sq.mt. The combination of treatments namely Azotobacter 8 kg/ha+ PSB 8 kg/ha+ VAM 8 kg/ha (T 12 ) resulted the best optimal doze for garlic givingplant height 79.83 cm, average number of leaves 9.86, average diameter of pseudo stem 1.13 cm, average volume of bulb 48.23 cc and T 12 produced 117.67 numbers of "A" grade bulbs or 67.24% out of 175 bulbs.