Clover (IMAGE) Penn State Caption The research evaluated a cover crop rotation using red clover (shown above), frost-seeded into winter wheat in March, and winter rye, planted after corn was harvested in the fall. Credit Tom Heutte, USDA Forest Service, <a target="_blank" href="http://www.Bugwood.org">Bugwood.org</a> Usage Restrictions non commercial use 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.