Does having mycorrhizae benefit a
   plant?

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.