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
Image of Zonal Classification of Soil
Image of 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 |
Image of Global Distribution of Alfisols
Image of Global Distribution of Alfisols
Image of Distribution of Andisols
Image of Distribution of Andisols
Image of Global Distribution of Aridisols
Image of Global Distribution of Aridisols
Image of Global Distribution of Entisols
Image of Global Distribution of Entisols
Image of Global Distribution of Gelisols
Image of Global Distribution of Gelisols
Image of Global Distribution of Histosols
Image of Global Distribution of Histosols
| 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 |
Image of Global Distribution of Inceptisols
Image of Global Distribution of Inceptisols
Image of Global Distribution of Mollisols
Image of Global Distribution of Mollisols
Image of Global Distribution of Oxisols
Image of Global Distribution of Oxisols
Global Distribution of Spodosols
Global Distribution of Spodosols
Global Distribution of Ultisols
Global Distribution of Ultisols
Image of Global of Distribution of Vertisols
Image of Global of Distribution of Vertisols
Soil Orders Associated with Climates
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Oxisols - Af [Aw]
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Ultisols - Cfa [Af, Aw]
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Alfisols - Aw, Cs, Cfa, Dfa, Dfb
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Spodosols - Dfb, Dfc
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Gelisols - ET [Dfc, Dw]
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Mollisols – dry sections of Cfa, Dfa, Dfb and wet margins of BSk
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Aridisols - BWh, BWk
-Manishika