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Department of Soil and Water Systems

Physical Address:
E. J. Iddings Agricultural Science Laboratory, Rm 242
606 S Rayburn St

Mailing Address:
875 Perimeter Drive MS 2340
Moscow, ID 83844-2340

Phone: 208-885-0111

Email: cals-sws@uidaho.edu

Web: uidaho.edu/cals/sws

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Alfisols

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. The combination of generally favorable climate and high native fertility allows Alfisols to be very productive soils for both agricultural and silvicultural use. They are divided into five suborders: Aqualfs, Cryalfs, Udalfs, Ustalfs and Xeralfs.

Alfisols occupy approximately 10.1 percent of the global ice-free land area. In the U.S., they account for approximately 13.9 percent of the land area. They support about 17 percent of the world's population.

Alfisols
Alfisols have both: (1) a subsurface zone of clay accumulation — either an argillic, kandic or natric horizon; and (2) base saturation of at least 35 percent in the subsoil. This second criterion is what distinguishes Alfisols from Ultisols. (USDA-NRCS image)

Contact

Department of Soil and Water Systems

Physical Address:
E. J. Iddings Agricultural Science Laboratory, Rm 242
606 S Rayburn St

Mailing Address:
875 Perimeter Drive MS 2340
Moscow, ID 83844-2340

Phone: 208-885-0111

Email: cals-sws@uidaho.edu

Web: uidaho.edu/cals/sws

Directions