What You Need to Know
In this system, the beans form symbiotic Rhizobium nodules that fix atmospheric nitrogen into ammonia, which is then converted to ammonium and assimilated by the corn and squash. The corn provides vertical support for the beans, while the squash spreads horizontally to shade the soil, reducing evaporation and suppressing weeds. Together, these interactions enhance soil fertility, moisture retention, and overall crop resilience.
The Science
Primary Reaction
Biological nitrogen fixation by Rhizobium spp. in bean root nodules