DONALD L. SPARKS is the Unidel S. Hallock du Pont Chair and Francis Alison Professor at the University of Delaware. He is internationally recognized for his research in the areas of kinetics of biogeochemical processes and surface chemistry of natural materials. His research has focused on fate and transport of trace metals in soil and water, soil remediation, water quality, and carbon sequestration in soils. Dr. Sparks is the author of two previous editions of Environmental Soil Chemistry and more than 350 refereed papers and book chapters. He is fellow of five scientific societies, and he has been the recipient of major awards and lectureships including the Geochemistry Medal from the American Chemical Society, the Liebig Medal from the International Union of Soil Sciences, the Einstein Professorship from the Chinese Academy of Sciences and the Philippe Duchaufour Medal from the European Geosciences Union. Dr. Sparks served as president of the Soil Science Society of America and the International Union of Soil Sciences, has served on advisory committees for several national laboratories and national and international centers and institutes, and served as chair of the U.S. National Academy of Sciences (NAS) Committee for Soil Sciences and other NAS Committees.

• 1. The Role of Biodiversity in Agronomy2. The Depth Distribution of Soil Organic Carbon in Relation to Land Use and Management and the Potential of Carbon Sequestration in Subsoil Horizons3. Soil Scientists in a Changing World4. Enhancing Nitrogen Use Efficiency in Crop Plants5. Forage Chicory (Cichorium Intybus L.): A Review of its Agronomy and Animal Production 6. Pre-sowing Seed Treatment – A Shotgun Approach to Improve Germination, Plant Growth and Crop Yield Under Saline and Non-Saline Conditions7. Methodologies and the Practical Aspects of the Bulk Soil EC (óa) – Soil Solution EC (ow) Relations8. Oxygation Unlocks Yield Potentials of Crops in Oxygen-Limited Soil Environments