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Authors vii <p>Preface to the First Edition ix</p> <p>Preface to the Second Edition x</p> <p>Preface to the Third Edition xi</p> <p>Preface to the Fourth Edition xiii</p> <p>Preface to the Fifth Edition xiv</p> <p>Preface to the Sixth Edition xv</p> <p><b>1.</b> Introduction 3</p> <p><b>2.</b> Morphology and Composition of Soils 35</p> <p><b>3.</b> Soil-forming Factors: Soil as a Component of Ecosystems 89</p> <p><b>4.</b> Soil Materials and Weathering 141</p> <p><b>5.</b> Soil-forming Processes 163</p> <p><b>6.</b> Modern Soil Classification Systems 181</p> <p><b>7.</b> U.S. Soil Taxonomy 207</p> <p><b>8.</b> Alfisols: High Base Status Soils with Finer-textured Subsoil Horizons 233</p> <p><b>9.</b> Andisols: Soils with Andic Soil Properties 249</p> <p><b>10.</b> Aridisols: Soils of Dry Regions 265</p> <p><b>11.</b> Entisols: Recently Formed Soils 283</p> <p><b>12.</b> Gelisols: Very Cold Soils 293</p> <p><b>13.</b> Histosols: Organic Soils 307</p> <p><b>14.</b> Inceptisols: Embryonic Soils with Few Diagnostic Features 321</p> <p><b>15.</b> Mollisols: Grassland Soils of Steppes and Prairies 331</p> <p><b>16.</b> Oxisols: Low Activity Soils 349</p> <p><b>17.</b> Spodosols: Soils with Subsoil Accumulations of Humus and Sesquioxides 361</p> <p><b>18.</b> Ultisols: Low Base Status Soils with Finer-textured Subsoil Horizons 375</p> <p><b>19.</b> Vertisols: Shrinking and Swelling Dark Clay Soils 385</p> <p><b>20.</b> Spatial Arrangement of Soils: Soilscapes and Map Units 397</p> <p><b>21.</b> Interpretations of Soil Surveys and Technical Soil Classification 425</p> <p>Bibliography 437</p> <p>Index 531</p> <p>Color plate section located between pages 232 and 233</p>

<p>“You should buy it and persuade your library to buy it as well.”  (<i>European Journal of Soil Science</i>, 1 December 2011)</p> <p>“The book is well suited for practicing and future soil scientist, geographers, geomorphologists, soil conservationists, sanity engineers, ecologists, foresters, agronomists, and archaeologists.  Summing Up: Recommended.  Upper-division undergraduates and above.”  (<i>Choice</i>, 1 April 2012)</p> <p> </p>

<b>STANLEY W. BUOL</b> is a Distinguished Professor Emeritus of Soil Science at North Carolina State University, Raleigh, where he held William Neal Reynolds Distinguished and Alumni Distinguished Graduate Professorships before retirement. He earned B.S., M.S., and PhD. Degrees from the University of Wisconsin- Madison. Prior to moving to North Carolina State University, he was a faculty member of the Agricultural Chemistry and Soils Department at the University of Arizona. He is a Fellow in both the Soil Science Society of America and American Society of Agronomy. He has received the International Soil Science Award and Distinguished Service Award from the Soil Society of America and the Achievement Award from the North Carolina Soil Science Society. In addition to several papers in scientific journals and book chapters, he has authored the book <i>Soils, Land, and Life.</i> <p><b>RANDAL J. SOUTHARD</b> is Professor of Soil Genesis and Morphology and Soil Scientist in the California Agricultural Experiment Station at the University of California, Davis. He holds a B.S. degree in biology and a M.S. degree in soil science from Utah State University and a Ph.D. in soil science from North Carolina State University. He is a member of the Soil Science Society of America, Sigma Xi, Gamma Sigma Delta, and the International Union of Soil Sciences and is a Fellow of the Soil Science Society of America. He served as Associate Dean of Environmental Sciences in the College of Agricultural and Environmental Sciences at UC Davis from 1999 to 2009. He teaches courses in introductory soil, pedology, and environmental sciences. He served as president of the Western Society of Soil Science from 1995 to 1996 and was an associate editor for the Soil Science Society of America Journal from 1999 to 2002. He has published articles in various journals including Soil Science Society of America Journal, Geoderma, Soil Science, Clays and Clay Minerals, Soil Survey Horizons, California Agriculture, Journal of Environmental Quality, Global Change, Biology, and Atmospheric Environment.</p> <p><b>ROBERT C. GRAHAM</b> is professor of Soil Mineralogy and Pedology at the University of California, riverside. He has degrees in soil science from the University of California at Davis, Utah State University, and North Carolina State University, He is a member of the Soil Science Society of America, International Union of Soil Sciences, Professional Soil Scientists Association of California, California Forest Soils Council, and the Geological Society of America. He has served as Associate Editor for the <i>Soil Science Society of</i> <i>America</i> <i>Journal</i> and is a Fellow in the Soil Science Society of America. At UC Riverside he advises graduate students and conducts research and teaches courses in soil mineralogy, soil geomorphology, and soils of natural ecosystems and landforms. He has published articles on these topics in a variety of journals including <i>Soil Science Society of America Journal, Geoderma, Soil Science, Biogeochemistry, Clays and Clay Minerals Forest Ecology and Management, Canadian Journal of Forestry, Oecologia, Geology, Vadose Zone Journal, Catena, International Journal of Wildland Fire, and Journal of Arid Environment</i>.</p> <p><b>PAUL A. McDANIEL</b> is Professor of Pedology at the University of Idaho in Moscow. He is also an Affiliate Faculty member at the Centro Agronomico Tropical de Investigacion y Ensenanza (CATIE) in Turrialba, Costa Rica, and the Idaho Agricultural Experiment Station representative to the National Cooperative Soil Survey program. He holds a B.S. degree in Biology from University of Kentucky, an M.S. in Soil Science from Montana State University, and a Ph.D. in Soil Science from North Carolina State University. He served as Associate Editor for the Soil Science of America Journal from 2000-2006 and as Technical Editor for the Pedology, Soil Mineralogy, and Wetland Soils sections form 2007 to present. He is a member of Soil Services, and is a Fellow of the Soil Science Society of America. He teaches courses in introductory soil science, pedology, and soil mineralogy, and has published research articles in various journals, including Soul Science Society of America Journal, Geoderma, Soil Science, Clays and Clay Mineral, Catena, Journal of Environmental Quality, Forest Science, Water Resources Research, Hydrological Processes, and Vandose Zone Journal.</p>

Soils are natural bodies wherein inorganic components derived from geologic materials combine with organic materials produced by biological activity in ecosystems. The nearly infinite combinations of geologic materials and biological diversity of life on earth have produced a staggering array of chemical, physical, and biological reactions that over time have created the soils that we observe today. In the United States more than 23,000 kinds of soil are formally identified, and the number of soils in the world is not known. <p><i>Soil Genesis and Classification, Sixth Edition</i> builds on the strong foundations of this venerable soil science text to present the most current concepts on how soils are formed and sustained within the dynamic changes of ecosystem successions and climatic dynamics. The sixth edition has been fully revised and updated, incorporating more detailed data regarding specific examples of how soils have acquired various characteristics. Methods of communicating and analyzing spatial information have been expanded in light of the latest technological advances. Color plates have also been added to allow readers a better visualization of various soils.</p> <p><i>Soil Genesis and Classification, Sixth Edition</i> is a comprehensive work that meets the diverse range of needs from soil science students professionals in fields ranging from agriculture and ecology to civil engineering. The well-established text will be a vital source of information for those with a need to better understand soils and their various impacts on ecosystem functions, on environmental quality, and on the multitude of human endeavors to sustain human life on earth.</p>

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