University of Idaho College of Agricultural and Life Sciences Plant, Soil & Entomological Sciences Soil & Land Resources
Soil Orders
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Aridisols (from Latin aridus, "dry") are CaCO3-containing soils of arid regions that exhibit at least some subsurface horizon development. They are characterized by being dry most of the year and limited leaching. Aridisols contain subsurface horizons in which clays, calcium carbonate, silica, salts, and/or gypsum have accumulated. Materials such as soluble salts, gypsum, and CaCO3 tend to be leached from soils of moister climates.

Aridisols occupy ~12% of the Earth's ice-free land area and ~8.3% of the US.

Aridisols are used mainly for range, wildlife, and recreation. Because of the dry climate in which they are found, they are not used for agricultural production unless irrigation water is available.

Aridisols are divided into 7 suborders: Cryids, Salids, Durids, Gypsids, Argids, Calcids, and Cambids. Click here for more information about these suborders. Click here to view a map of their distribution in the US.

Click on map to view larger image

Click on map to view larger image
<< back to Soil Orders list Aridisol example #1 >> 
1. Argid/Cambid landscape
central Arizona
2. Haplocalcid landscape
southern Idaho
3. Xeric Haplocalcid
southern Idaho
4. Typic Aquisalid
central Nevada
5. Typic Petroargid
southern New Mexico
6. Argidurid landscape
southern Idaho
7. Xeric Argidurid
southern Idaho
8. Exposed duripan
southern Idaho
If you have any comments, suggestions, or questions about the 12 Soil Orders web site,
please contact
Dr. Paul McDaniel  at the Soil Science Division,
University of Idaho, Moscow, ID 83844-2339.