In this paper we are using various concentration of nitrogen source, e.g. peptone, few carbon, viz.,maltose and lactose, inorganic chemicals, viz., Mgso4 and FeSo4 (0.5 to 1.0) were screened to determine the most suitable concentration for better yield of Pleurotus sajor-caju, It was found that all the carbon source and inorganic chemicals gave maximum yield and biological efficiency in 0.5 per cent concentration. On that basis maltose and MgSo4 were proved superior carbon source and inorganic chemical, respectively. Peptone, the semisolid protein as nitrogen source gave maximum Yield and biological efficiency in 0.5 percent concentration.

Yield, Oyster Mushroom,Biological Efficiency, Chemical.