Azotobacter Bio Fertilizer for Soil has Chroococcum as the dominant inhabitant in arable soils that is capable of fixing n2 [2-15 mg n2 fixed /g of carbon source] in culture media. The Azotobacter Bio Fertilizer contains bacterium that produces abundant slime which helps in soil aggregation. The Azotobacter Bio Fertilizer can increase Chroococcum in soil that has less organic content. The Azotobacter Bio Fertilizer for Soil also improves the presence of antagonistic micro organisms.