Soil Genesis and Classification

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