University of Idaho College of Agricultural and Life Sciences Plant, Soil & Entomological Sciences Soil & Land Resources
Soil Orders
Soil Links
  Gelisols    Histosols    Spodosols    Andisols    Oxisols    Vertisols    Aridisols    Ultisols    Mollisols    Alfisols    Inceptisols    Entisols

Alfisols are moderately leached soils that have relatively high native fertility. These soils have mainly formed under forest and have a subsurface horizon in which clays have accumulated. Alfisols are primarily found in temperate humid and subhumid regions of the world.

Alfisols occupy ~10.1% of the global ice-free land area. In the US, they account for ~13.9% of the land area. Alfisols support about 17% of the world's population.

The combination of generally favorable climate and high native fertility allows Alfisols to be very productive soils for both agricultural and silvicultural use.

Alfisols are divided into 5 suborders: Aqualfs, Cryalfs, Udalfs, Ustalfs, and Xeralfs. 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
1. Albaqualf landscape
central Missouri
2. Mollic Albaqualf

3. Udic Paleustalf northcentral Texas
4. Typic Hapludalf
southern Michigan
5. Haplocryalf landscape
southeastern Idaho
6. Typic Haplocryalf
southeastern Idaho
7. Fragixeralf landscape
northern Idaho
8. Vitrandic Fragixeralf
northern 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.