Soil structure comparison (IMAGE) Purdue University Caption Bryan Overstreet, Purdue Extension soil health coordinator and conservation agronomist of the Conservation Cropping Systems Initiative, compares the structure of two soil samples. (Credit: Purdue Agricultural Communications/Steve Doyle) 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.