Advances in Agronomy

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.

• Advances in Portable X-Ray Fluorescence (PXRF) for Environmental, Pedological, and Agronomic ApplicationsDavid C. Weindorf, Noura Bakr and Yuanda ZhuEnvironmental Chemistry and Toxicology of IodineEthan M. Cox and Yuji AraiGuttation: New Insights into Agricultural Implications Sanjay SinghAssessing Nutrient Use Efficiency and Environmental Pressure of Macro-Nutrients in Bio-Based Mineral Fertilizers: A Review of Recent Advances and Best Practices at Field ScaleCéline Vaneeckhaute, Greet Ghekiere, Evi Michels, Peter A. Vanrolleghem, Filip M.G. Tack and Erik MeersExploring Options for Lowland Rice Intensification under Rainfed and Irrigated Ecologies in East and Southern Africa: The Potential Application of Integrated Soil Fertility Management principlesNhamo Nhamo, Gerald Kyalo and Virgilio DinheiroManagement of Soil Acidity of South American Soils for Sustainable Crop ProductionNanda Kumar Fageria and Adriano Stephan Nascente