Cover Crop Field (IMAGE) American Society of Agronomy Caption Cover crop growth in Urbana, Illinois in April following a mild winter shows strong cereal rye and annual ryegrass growth. Credit Gevan Behnke Usage Restrictions For use with this 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.