Inoculation of different plant wastes with microorganisms resulted in a release of maximum reducing sugars (33%) from sugar-cane leaves when subjected toPenicillium oxalicum. Maximum protein was formed from sugar-cane bagasse inoculated withAspergillus fumigatus. Association of sugar-cane leaves withP. oxalicum showed the highest digestibility. The use of such microorganisms may help to provide additional and valuable proteins ultimately for human use.