Agronomist Yichao Rui (IMAGE) Purdue University Caption Yichao Rui, Purdue assistant professor of agroecology, examines a soil sample. Credit Credit: Purdue Agricultural Communications/Steve Doyle Usage Restrictions News organizations may use this image in reports about the work of Purdue University’s Yichao Rui, Ashley Adair and their colleagues. 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.