Zonal Classification of Soil by USDA - 12 Soils Categorized YouTube Lecture Handouts
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Zonal Classification of Soil by USDA - 12 Soils Categorized
Zonal Classification of Soil
Soil order | Defining characteristics | Percent earth land area |
---|---|---|
Alfisol | Moderate leaching; B horizon enriched in clay; humid forest vegetation | 9.77 |
Andisol | Volcanic-ash parent material | 0.73 |
Aridisol | Hot, dry climate; weak B horizon | 18.53 |
Entisol | Little or no horizonation or swelling clay | 10.61 |
Gelisol | Permafrost within 2 m of land surface | - |
Histosol | Organic parent material | 1.84 |
Inceptisol | Little or no B horizon development | 21.80 |
---|---|---|
Mollisol | Thick, soft, black A horizon | 5.99 |
Oxisol | Hot, humid climate; A horizon enriched in iron & aluminum oxides & kaolinite | 7.00 |
Spodosol | Cool, humid climate; B horizon enriched in iron & aluminum oxides & organic matter; sandy parent material | 3.45 |
Ultisol | Warm, humid climate; B horizon enriched in clay; extensive leaching | 8.12 |
Vertisol | Little or no horizonation; high content of swelling clay | 2.23 |
Soil Orders Associated with Climates
- Oxisols - Af [Aw]
- Ultisols - Cfa [Af, Aw]
- Alfisols - Aw, Cs, Cfa, Dfa, Dfb
- Spodosols - Dfb, Dfc
- Gelisols - ET [Dfc, Dw]
- Mollisols – dry sections of Cfa, Dfa, Dfb and wet margins of BSk
- Aridisols - BWh, BWk
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