for more context - soybean is used to stuff nitrogen back into the soil, for the real cash crop (corn, etc). So what you'll see is fields rotate between corn &

for more context - soybean is used to stuff nitrogen back into the soil, for the real cash crop (corn, etc). So what you'll see is fields rotate between corn & soybean, or corn, corn, & soybean. The US produces about 4 billion bushels of both corn and soybeans per year.