The study revealed that the addition of rice bran to substrates could be beneficial as a nutrient supplement and promoter to growth and yield. The higher mushroom yield and biological efficiency correspond to the mycelia growth, colonization period and harvest period. Baysal et al., (2003) obtained an increase in the biological efficiency with the increasing concentration (10 and 20%) of rice bran during the production of P. ostreatus. Mane et al., (2007) reported that organic supplements such as groundnut oilseed cake, gram powder and rice bran not only affected growth parameters but also increased yields of P. sajor caju. They also found that the best yield in addition of rice bran supplement with various lignocellulosic substrates yielded better than without supplement. Similar observations have also been made by several other researchers (Bano et al., 1993). This fact can be related to our research where the addition of rice bran with different substrates resulted in an increase in productivity and biological efficiency. Among nine treatments tested for mushroom growth of P. sajorcaju, banana leaves with or without supplementation found to be the least responsive in terms of yield and biological efficiency. Low performance by banana leaves may be due to lower break down of cellulosic and lignin substrates. In a similar study, Bonatti et al., (2004) reported 7.51% biological efficiency of P. sajor-caju on banana tree straw with 5% rice bran supplement. However, our study showed better results on banana leaves than reported by Bonatti et al., (2004). Not only yield but also size of mushroom was better with rice bran supplements in all substrates