Nitrogen-fixing bacteria (Azotobacter chroococcum), phosphate solubilising bacteria (Enterobacter cloacea), sulphur oxidizing bacteria (Thiobacillus thiooxidans), phosphate solubilising fungi (Trichoderma harzianum) were used as a microbial activator in 15 different treatments for composting of bagasse enriched with rock phosphate, urea, and sulphur.