Erin Johnson, Elizabethtown College (IMAGE) American Society of Agronomy Caption Co-author Erin Johnson collects data from a residential site. Credit Photo courtesy of David Bowne. Usage Restrictions None 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.