Donald Sparks, University of Delaware (IMAGE) University of Delaware Caption Donald Sparks, S. Hallock du Pont Chair in Plant and Soil Sciences at the University of Delaware and director of the Delaware Environmental Institute, will receive the Liebig Medal from the International Union of Soil Sciences in August 2010. Credit Ambre Alexander/University of Delaware Usage Restrictions Image must include credit to University of Delaware. 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.