Soil Series Atlas

Pullman soil series

Fine, mixed, superactive, thermic Torrertic Paleustolls

050100150200cm1 ft2 ft3 ft4 ft5 ft6 ftApTopsoil · plowed0–13 cm · 0–5 inBt1Subsoil · clay build-up13–46 cm · 5–18 inBt2Subsoil · clay build-up46–84 cm · 18–33 inBtk1Subsoil · clay build-up, lime (carbonate)build-up84–132 cm · 33–52 inBtk2Subsoil · clay build-up, lime (carbonate)build-up132–168 cm · 52–66 inBtk3Subsoil · clay build-up, lime (carbonate)build-up168–203 cm · 66–80 in050100150200cmApTopsoil · plowed0–13 cm · 0–5 inBt1Subsoil · clay build-up13–46 cm · 5–18 inBt2Subsoil · clay build-up46–84 cm · 18–33 inBtk1Subsoil · claybuild-up, lime(carbonate) build-up84–132 cm · 33–52 inBtk2Subsoil · claybuild-up, lime(carbonate) build-up132–168 cm · 52–66 inBtk3Subsoil · claybuild-up, lime(carbonate) build-up168–203 cm · 66–80 in
Typical pedon, to scale: 203 cm (80 in), 6 horizons.

Mollisols — soils with a thick, dark, organic-rich topsoil

With 3.07 million acres mapped, Pullman is the 12th-largest of 24,791 U.S. soil series. In Texas only one series covers more ground. It is the only series in the atlas that belongs to the great group Paleustolls. Its solum is 99 cm thicker than the median for Mollisols.

Depth
Very deep
Drainage
Well drained
Water movement
Slow

Compare with another seriesSimilar series in the finder

Where Pullman is mapped

3,074,689 acres in 26 soil survey areas, from current SSURGO data.

AlabamaArizonaColoradoFloridaGeorgiaIndianaKansasMaineMassachusettsMinnesotaNew JerseyNorth CarolinaNorth DakotaOklahomaPennsylvaniaSouth DakotaTexas: 3,053,015 acresWyomingConnecticutMissouriWest VirginiaIllinoisNew Mexico: 21,674 acresArkansasCaliforniaDelawareDistrict of ColumbiaIowaKentuckyMarylandMichiganMississippiMontanaNew HampshireNew YorkOhioOregonTennesseeUtahVirginiaWashingtonWisconsinNebraskaSouth CarolinaIdahoNevadaVermontLouisianaRhode Island

Share of all Pullman acres

  1. Texas99%
  2. New Mexico0.7%
  • Rank in the state · share of its mapped soil
  • Texas 2nd of 1,565 · 1.98%

In the field

Drainage

Well drained

Drains fastStays wet

Soil depth

Very deep

ShallowDeep

Permeability

Slow

SlowFast

Of the 6 atlas series that have slow permeability, this is the largest.

Parent material
Eolian deposits
Landform
Plains
Type location
Texas

How it is classified

  1. OrderMollisols
  2. SuborderUstolls
  3. Great groupPaleustolls
  4. SubgroupTorrertic Paleustolls
  5. FamilyFine, mixed, superactive, thermic Torrertic Paleustollsfine particle-size classmixed mineralogy classsuperactive cation-exchange activity classthermic soil temperature regime

Against other Mollisols

Pullman makes up 0.71% of all mapped Mollisols — the 4th largest of 7,593 series in the order.

Solum thickness (topsoil + subsoil)

203 cm over a median of 104 cm

Depth to the subsoil

13 cm under a median of 25 cm

Depth described

203 cm over a median of 152 cm

Its relatives

1 other established series share the family “Fine, mixed, superactive, thermic Torrertic Paleustolls”

  1. Pullman3.1 M
  2. Pantex371 k

Other Mollisols in this atlas

  1. Pullman203 cm · Torrertic Paleustolls
  2. Williams152 cm · Typic Argiustolls
  3. Ector102 cm · Lithic Calciustolls
  4. Harney152 cm · Typic Argiustolls
  5. Tarrant76 cm · Lithic Calciustolls
  6. Ulysses200 cm · Torriorthentic Haplustolls

Horizon by horizon

HorizonLayerDepthThickness
ApTopsoil: plowed0–13 cm0–5 in13 cm
Bt1Subsoil: clay build-up13–46 cm5–18 in33 cm
Bt2Subsoil: clay build-up46–84 cm18–33 in38 cm
Btk1Subsoil: clay build-up, lime (carbonate) build-up84–132 cm33–52 in48 cm
Btk2Subsoil: clay build-up, lime (carbonate) build-up132–168 cm52–66 in36 cm
Btk3Subsoil: clay build-up, lime (carbonate) build-up168–203 cm66–80 in35 cm

Sources: USDA–NRCS Official Series Description (revised 2022-09), Soil Classification database and SSURGO. Ranks computed by Soil Series Atlas. Method · Guides