Corn and Cover Crop Comparison (image) American Society of Agronomy Share Print E-Mail 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. Share Print E-Mail 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.