Hairy Vetch and Cereal Rye Cover Crop (IMAGE) American Society of Agronomy Caption A cover crop mixture of hairy vetch and cereal rye is pictured. Credit Hanna Poffenbarger. 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.