A big reward potential is attracting research dollars to a new cover crop management variation in several Midwest states. Continuous cropping with corn and soybeans is standard practice in the Midwest, but only about 7% of Midwest farms use cover crops, according to the University of Illinois. Cover crop adoption is slow, and it faces challenges. Real or perceived risks may discourage adoption. These include: • However, scientists and the USDA see significant long-term benefits.