Spores of fungi forming vesicular-arbuscular mycorrhiza were collected from Ibadan, Iwo and Egbeda series at the experimental plots of Federal Department of Agricultural Research, Moor Plantation, Ibadan. These were used to inoculate cowpea, maize and tomato. The presence of vesicular-arbuscular mycorrhiza was detected in the roots of these plants after a few weeks of growth. Dry weights of roots and shoots, and total P and N were determined. There was a positive correlation between the presence of vesicular-arbuscular mycorrhiza and the amounts of P and N in the tissues.