LECTURE NOTES ON THE MAJOR
SOILS OF THE WORLD
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Edited by: Paul Driessen, Wageningen Agricultural University, International Institute for Aerospace Survey and Earth Sciences (ITC), Jozef Deckers, Catholic University of Leuven Otto Spaargaren, International Soil Reference and Information Centre Freddy Nachtergaele, FAO
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ISBN 925-104637-9
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© FAO 2001
The World Reference Base for Soil Resources
Reference Soil Groups
Set #1.
Organic Soils
Set #2. Mineral Soils conditioned by Man
Set #3. Mineral Soils conditioned by Parent Material
Major landforms in volcanic landscapes
Major landforms in landscapes with sands
Major landforms in landscapes with smectites
Set #4. Mineral Soils conditioned by Topography
Major landforms in alluvial lowlands
Fluvisols (FL)
(with special attention for Thionic Fluvisols)
Major landforms in mountains and formerly glaciated regions
Set #5. Mineral Soils conditioned by Limited Age
Set #6. Mineral Soils conditioned by a Wet (Sub)Tropical Climate
Major landforms in the (sub-)humid tropics
Set #7. Mineral Soils conditioned by a (semi-)Arid Climate
Major landforms in (semi-)arid regions
Set #8. Mineral Soils conditioned by a Steppic Climate
Major landforms in steppe regions
Set #9. Mineral Soils conditioned by a (Sub)Humid Temperate Climate
Major landforms in (Sub-)Humid Temperate Regions
Set #10. Mineral Soils conditioned by Permafrost
Annex 1. Key to Reference Soil Groups
Annex 2. Diagnostic horizons, properties and materials
Annex 3. Qualifiers (formative elements for naming soil units)
Annex 4. Suggestions for ranking qualifiers in soil unit names