Corn and Cover Crop Comparison (IMAGE) American Society of Agronomy Caption Cover crops work well to suppress weeds when paired with soybeans, but not as well with corn. The field on right was grown with a cover crop, and researches believe that the cover crop prevented the corn from accessing essential nutrients. Credit Photo credit Kerry Clark. Usage Restrictions Please use with story only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.