The present study entitled “Effect of liquid formulations of PSB on growth and yield of mung bean” was carried out at Department of Plant Pathology and Agricultural Microbiology, College of Agriculture, Pune. The mung bean variety used for experiment was ‘Vaibhav’. The objectives for present research were to study the effect of liquid formulations of PSB inoculation on Soil microbial population dynamics at periodic intervals in soil, nitrogen and phosphorus uptake by mung bean, growth and yield of mung bean as influenced by application of liquid PSB. There were ten treatments. These include seed treatment with liquid PSB @ 25ml/kg of seed, Seed treatment with liquid PSB@ 25ml/kg of seed, seed treatment with liquid PSB@ 25 ml/kg of seed each, seed treatment with liquid PSB@ 25 ml/kg of seed each +75% of recommended dose of fertilizers, seed treatment of carrier based PSB @ 25g / kg of seed, seed treatment of carrier based PSB @ 25g / kg of seed, seed treatment of carrier based PSB25g/kg of seed each, seed treatment of carrier based PSB25g/kg of seed each+75% recommended dose of fertilizers. The tenth treatment is absolute control. Each treatment is replicated three times in Randomized Block Design. The liquid formulations of PSB show positive effect on soil chemical, physical and microbial properties. There was ascendance in trend of population of PSB in soil which show descending trend as crop approaches maturity. Available nitrogen and phosphorus increased from initial stage of crop growth to harvest. After considering all the parameters, inference could be drawn that PSB application enhance the growth leading to increase in yield of mung bean. It was observed that T3: S.T.L. liquid PSB @ 25 ml/ kg of seed each had higher arithmetic value for growth parameters including germination, plant height, number of branches, number of leaves, LAI, root nodules and yield parameters pods/ plant, 1000 seed weight ultimately yield/ ha. Other parameters including chemical and microbial parameters showed significant increase over the absolute control. It was followed by T7: S.T.C.B. PSB each for above parameters. Above investigation concluded that inoculation of liquid formulation of PSB enhanced growth as well as yield of mung bean. Population of PSB as influenced by inoculation of liquid formulations significantly was enhanced. Total N and P uptake by plant and grain sample was found to be significantly higher due microbial inoculations. Available N and P from soil at harvest also showed significant increase over absolute control. Ultimately higher net returns and B: C ratio was obtained for liquid bioinoculants.

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