Soil Series Atlas

Alfisols

Moderately leached soils with a clay-enriched subsoil

050100150cm1 ft2 ft3 ft4 ft5 ftAbove the subsoilTopsoil and any leached layer0–23 cm · 0–9 inSubsoilFirst B horizon to the base of the solum23–127 cm · 9–50 inBelow the solumParent material or rock, to the mediandepth described127–156 cm · 50–61 in050100150cmAbove the subsoilTopsoil and any leachedlayer0–23 cm · 0–9 inSubsoilFirst B horizon to thebase of the solum23–127 cm · 9–50 inBelow the solumParent material orrock, to the mediandepth described127–156 cm · 50–61 in
The typical Alfisols profile: a schematic drawn to scale from the medians of 3,678 official series descriptions. It is not a real pedon.

Soil order · 3,833 established series in the classification database

Alfisols cover 276.47 million acres of mapped U.S. soils — 17.3% of all series acres, the 2nd largest of the twelve orders — across 4,001 mapped series.

Median solum thickness in their typical pedons is 127 cm, with the first B horizon at 23 cm. Official descriptions of Alfisols go down a median 156 cm.

Alfisols among the twelve orders

Share of all acres mapped to a named series, with this order highlighted.

Mollisols 27.3% · Alfisols 17.3% · Entisols 12.3% · Ultisols 11.8% · Inceptisols 11.4% · Aridisols 9.7% · Spodosols 3.7% · Vertisols 2.7% · Histosols 1.9% · Andisols 1.3% · Gelisols 0.5% · Oxisols <0.1%

Guide: The twelve soil orders, measured

Largest Alfisols series

Mapped acres in current SSURGO data, across all series in the order.

  1. Amarillo3,044,539 acres3.0 M
  2. Blount2,582,525 acres2.6 M
  3. Guyton2,301,089 acres2.3 M
  4. Fayette2,246,165 acres2.2 M
  5. Loring2,223,340 acres2.2 M
  6. Memphis1,811,118 acres1.8 M
  7. Providence1,719,221 acres1.7 M
  8. Eden1,536,884 acres1.5 M
  9. Armstrong1,524,956 acres1.5 M
  10. Goss1,473,555 acres1.5 M

Alfisols on this site

16 Alfisols series profiled here, largest first, drawn at one depth scale.

  1. AmarilloAridic Paleustalfs · 2 states
  2. BlountAeric Epiaqualfs · 5 states
  3. GuytonTypic Glossaqualfs · 6 states
  4. FayetteTypic Hapludalfs · 4 states
  5. LoringOxyaquic Fragiudalfs · 6 states
  6. MenfroTypic Hapludalfs · 3 states · state soil
  7. CriderTypic Paleudalfs · 6 states · state soil
  8. MiamiOxyaquic Hapludalfs · 5 states · state soil
  9. MiamianOxyaquic Hapludalfs · 2 states · state soil
  10. LesterMollic Hapludalfs · 2 states · state soil
  11. SeitzUstic Glossocryalfs · 1 state · state soil
  12. HoneoyeGlossic Hapludalfs · 1 state · state soil
  13. San JoaquinAbruptic Durixeralfs · 1 state · state soil
  14. AntigoHaplic Glossudalfs · 2 states · state soil
  15. StuttgartAlbaquultic Hapludalfs · 1 state · state soil
  16. PamunkeyUltic Hapludalfs · 1 state · state soil