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The present investigation was carried out at Department of Plant Pathology and Agricultural Microbiology, PGI MPKV, Rahuri.The efficient PPFMs isolates  MT_10, MT₂₃ and MT₄  which were superior in producing IAA, GA, nitrogen fixation and sidrophore production were selected for development of liquid formulation. These three isolates were collectively grown by using media with a different composition.M3 media found a higher growth of PPFMs as compared to other media. The M3 media was further standardized by using different concentration of cell protectants. The luxuriant cell count (cfu) of all Methylobacterium was observed on the LM5 medium and devised as consortium or liquid formulation. The shelf life studies of liquid consortium was done by taking periodical count at monthly interval up to the 12 months. The PPFMs population in liquid formulation maintain its standard up to 210 days (seven months) which clearly shows that the selected liquid formulation having a good potentiality as a biofertilizer.

Key word: PPFMs bacteria, Standardized Media, Cell protectants, Shelf life, Bio fertilizer.