Isolation and characterization of azotobacter strains from brazilian soils

Thirty-eight Azotobacter spp strains isolated from Brasilian soils were characterized for the foollowing properties : utilization of different carbon sources, diffusible pigment production, melanin production, sodium-dependent growth, siderophore production, streptomycin resistance and antibiotic-like substances production. Four strains were identified : one as A. armeniacus and three as A. paspali.