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

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Zonal Classification of Soil

Image of Zonal Classification of Soil

Image of Zonal Classification of Soil

Image of Zonal Classification of Soil

Table of Soil Order
Table of Soil Order

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 Global Distribution of Alfisols

Image of Distribution of Andisols

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 Aridisols

Image of Global Distribution of Entisols

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 Gelisols

Image of Global Distribution of Histosols

Image of Global Distribution of Histosols

Image of Global Distribution of Histosols

Table of Soil Zonal Classification
Table of Soil Zonal Classification

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 Inceptisols

Image of Global Distribution of Mollisols

Image of Global Distribution of Mollisols

Image of Global Distribution of Mollisols

Image of Global Distribution of Oxisols

Image of Global Distribution of Oxisols

Image of Global Distribution of Oxisols

Global Distribution of Spodosols

Global Distribution of Spodosols

Global Distribution of Spodosols

Global Distribution of Ultisols

Global Distribution of Ultisols

Global Distribution of Ultisols

Image of Global of Distribution of Vertisols

Image of Global of Distribution of Vertisols

Image of Global of Distribution of Vertisols

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