Production of extracellular alkaline protease under Solid State Fermentation (SSF) by Bacillus megaterium NCIM-2087 was tested on substrates of different agrowastes, including soy cake, wheat bran, rice bran and green gram husk, with a pH ranging from 8-11, particle size above 7 m?, inoculum levels 1 mL to 5 mL/10 g of substrate, incubation time from 12 to 96 h and relative moisture levels from 60% to 140%. The peak alkaline protease produced by B. megatarium NCIM-2087 was observed in the soy cake substrate (5961.0 U/g), at pH 9, particle size 4-18 mμ, 3 mL/10 g of substrate inoculum level, 60 h of incubation time and at 100% relative moisture level. [ABSTRACT FROM AUTHOR]