Perennial Groundcover with Maize (IMAGE) American Society of Agronomy Caption Most of the maize stover has been removed from this field. Researchers planted grass in the maize field to protect the soil. Credit Photo credit Cynthia Bartel. 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.