Abstract
Several aspects of heterotrophic, free-living nitrogen-fixing bacteria specific to tropical environments are presented. WhileAzotobacter chroococcum andA. vinelandii seem to occur throughout the world,A. paspali, Derxia gummosa andBeijerinckia spp. have been found mainly in the tropics. Derxia occurred more frequently than previously supposed and was stimulated by moist soil conditions, particularly after flooding.A. paspali growth in soil even under experimental conditions, was strictly limited to the rhizosphere of a few varieties ofPaspalum notatum and the association took almost a year to become established.
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