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Dr. Raymond Weil, Professor, University of Maryland College Park
B.S. in Crop Science from Michigan State University, East Lansing, MI, 1970.
M.S. in Soil Science from Purdue University, West Lafayette, IN, 1973.
Ph.D. in Soil Ecology from Virginia Tech, Blacksburg, VA, 1977.
Elected Fellow in 2003 of both the Soil Science Society of America and the American Society of Agronomy.
Weil has been active in soil science research since 1972 and has made many contributions in the areas of nutrient cycling and management, environmental impact of soil management, and assessment of soil quality. His current research is focused on the assessment and improvement of soil quality and organic matter. He has conducted research in several countries outside the United States, including Ethiopia, Chad, Brazil, Honduras, Sri Lanka, Zimbabwe, Malawi and Tanzania. In addition to his teaching at the University of Maryland, he has conducted many training workshops for such agencies as the USDA, The World Bank, The Rodale Research Institute, and the International Food Policy Center.
Dr. Weil has authored or coauthored more than 100 scientific publications in soil science and related areas.
Dr. Nyle Brady
Dr. Brady has, since 1947, worked in education, research and research administration, focusing on both international and U.S. issues. He is past president of the SSSA and served six years as Editor-in-Chief of the SSSA Proceedings and is Emeritus Professor at Cornell University. He has served in leadership positions with Cornell University, the International Rice Research Institute, USAID, the United Nations Development Programme and the World Bank. He is recognized around the world as author and co-author of eleven editions of the world's most widely used soil science textbook, The Nature and Properties of Soils.
| The Soils Around Us | |
| Functions of Soils in Our Ecosystem | |
| Medium for Plant Growth | |
| Regulator of Water Supplies | |
| Recycler of Raw Materials | |
| Habitat for Soil Organisms | |
| Engineering Medium | |
| Pedosphere as Environmental Interface | |
| Soil as a Natural Body | |
| The Soil Profile and Its Layers (Horizons) | |
| Topsoil and Subsoil | |
| Soil: The Interface of Air, Minerals, Water, and Life | |
| Mineral (Inorganic) Constituents of Soils | |
| Soil Organic Matter | |
| Soil Water: A Dynamic Solution | |
| Soil Air: A Changing Mixture of Gases | |
| Interaction of Four Components to Supply Plant Nutrients | |
| Nutrient Uptake by Plant Roots | |
| Soil Quality, Degradation, and Resilience | |
| Conclusion Study | |
| Questions | |
| References | |
| Formation of Soils from Parent Materials | |
| Weathering of Rocks and Minerals | |
| Factors Influencing Soil Formation | |
| Parent Materials | |
| Climate | |
| Biota: Living Organisms | |
| Topography | |
| Time | |
| Four Basic Processes of Soil Formation | |
| The Soil Profile | |
| Conclusion Study | |
| Questions | |
| References | |
| Soil Classification | |
| Concept of Individual Soils | |
| Comprehensive Classification System: Soil Taxonomy | |
| Categories and Nomenclature of Soil Taxonomy | |
| Soil Orders | |
| Entisols (Recent: Little If Any Profile Development) | |
| Inceptisols (Few Diagnostic Features: Inception of B Horizon) | |
| Andisols (Volcanic Ash Soils) | |
| Gelisols (Permafrost and Frost Churning) | |
| Histisols (Organic Soils without Permafrost) | |
| Aridisols (Dry Soils) | |
| Vertisols (Dark, Swelling and Cracking Clays) | |
| Mollisols (Dark, Soft Soils of Grasslands) | |
| Alfisols (Argillic or Natric Horizon, Medium to High Bases) | |
| Ultisols (Argillic Horizon, Low Bases) | |
| Spodosols (Acid, Sandy, Forest Soils, Low Bases) | |
| Oxisols (Oxic Horizon, Highly Weathered) | |
| Lower-Level Categories in Soil Taxonomy | |
| Conclusion Study | |
| Questions | |
| References | |
| Soil Architecture and Physical Properties | |
| Soil Color | |
| Soil Texture (Size Distribution of Soil Particles) | |
| Soil Textural Classes | |
| Structure of Mineral Soils | |
| Formation and Stabilization of Soil Aggregates | |
| Tillage and Structural Management of Soils | |
| Soil Density | |
| Pore Space of Mineral Soils | |
| Soil Properties Relevant to Engineering Uses | |
| Conclusion Study | |
| Questions | |
| References | |
| Soil Water: Characteristics and Behavior | |
| Structure and Related Properties of Water | |
| Capillary Fundamentals and Soil Water | |
| Soil Water Energy Concepts | |
| Soil Water Content and Soil Water Potential | |
| The Flow of Liquid Water in Soil | |
| Infiltration and Percolation | |
| Water Vapor Movement in Soils | |
| Qualitative Description of Soil Wetness | |
| Factors Affecting Amount of Plant-Available Soil Water | |
| Mechanisms by Which Plants Are Supplied with Water | |
| Conclusion Study | |
| Questions | |
| References | |
| Soil and the Hydrologic Cycle | |
| Table of Contents provided by Publisher. All Rights Reserved. |
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