Soil genesis and classification

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