EXPERIMENT   Researchers grew soybean plants in soil treated with fungicide to prevent the formation of mycorrhizae in the experimental group. A control group was exposed to fungi that formed mycorrhizae in the soybean plants' roots.

 RESULTS   The soybean plant on the left is typical of the experimental group. Its stunted growth is probably due to phosphorus deficiency. The taller, healthier plant on the right is typical of the control group and has mycorrhizae.

 CONCLUSION   These results indicate that the presence of mycorrhizae benefits a soybean plant and support the hypothesis that mycorrhizae enhance the plant's ability to take up phosphorus and other minerals.