Inspecting soil quality (IMAGE) Purdue University Caption Yichao Rui, assistant professor of agronomy, inspects soil in a cornfield at Purdue University's Water Quality Field Station. Rui leads a study investigating the viability of using kura clover as a perennial cover crop associated with corn production. Credit Purdue Agricultural Communications / Joshua Clark Usage Restrictions News organizations may use this image in reports about the work of Purdue University's Yichao Rui and his collaboratores. License Original 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.