Plant growth can be increased by dual inoculation with Azospirillum and phosphate-solubilizing bacteria ( Belimov et al., 1995). Wu et al. (2005) showed that the application of biofertilizer containing beneficial microbes (Azotobacter chroococcum, Bacillus megaterium, and Bacillus mucilaginosus) growth-promoting on maize, and improve the soil properties in a greenhouse study.