SUMMARYGrowth and phosphorus nutrition of finger millet (Eleusine coracana) on a sterile, phosphorusdeficient soil was improved by inoculation with either the vesicular-arbuscular mycorrhizal fungus Glomus fasciculatus or with the streptomycete Streptomyces dnnamomeous. These micro-organisms interacted antagonistically when added simultaneously or with one 2 weeks after the other: Streptomyces reduced spore production and development of infection by Glomus, while Glomus reduced the multiplication of Streptomyces. Because of this antagonism, dual inoculations stimulated plant growth less than individual inoculations.