Azotobacter spp. is the free living nitrogen fixing aerobic bacterium. Azotobacter spp. released ammonia into the soil and improve soil fertility, Production of phyto hormones like IAA, Gibberillins and Cytokinins. Production of some antifungal substances which inhibits the growth of soil harmful fungi like Alternaria, Fusarium, Rhizoctonia, Selerotia curvularia and Helminthosporium and resulted in lowering the disease incidence. Antagonism against phytopathogens by production of siderophore, antifungal compounds and induction of different enzymes.