LOCATION WRIGHTSVILLE AR+LA OK TX

Established Series
LAQ; Rev.JDS:TR
11/2021

WRIGHTSVILLE SERIES

The Wrightsville series consists of very deep, poorly drained, very slowly permeable soils that formed in old silty and clayey alluvium. These soils are on level to depressional areas on old stream terraces. Slopes are less than 1 percent. Mean annual precipitation is about 1168 mm (46 in) and the mean annual air temperature is about 16.7 degrees C (62 degrees F).

TAXONOMIC CLASS: Fine, mixed, active, thermic Typic Glossaqualfs

TYPICAL PEDON: Wrightsville silt loam, in woodland. (Colors are for moist soil unless otherwise noted.)

Oi--0 to 3 cm (0 to 1 in); black (10YR 2/1) partially decomposed leaves, twigs, and roots; extremely acid.

A--3 to 5 cm (1 to 2 in); dark grayish brown (10YR 4/2) silt loam; weak fine granular structure; friable; many medium roots; extremely acid; abrupt smooth boundary. (0 to 13 cm [0 to 5 in] thick)

Eg1--5 to 25 cm (2 to 10 in); grayish brown (10YR 5/2) silt loam; weak medium granular structure; friable; many medium roots; extremely acid; abrupt smooth boundary. (20 to 36 cm [8 to 14 in] thick)

Eg2--25 to 43 cm (10 to 17 in); gray (10YR 6/1) silt loam; weak medium subangular blocky structure; friable; many medium and fine roots; common fine pores; common medium distinct yellowish brown (10YR 5/8) masses of iron accumulation in matrix; extremely acid; clear wavy boundary. (13 to 31 [5 to 12 in] thick)

Btg/E--43 to 58 cm (17 to 23 in); (Btg) gray (10YR 5/1) silty clay loam; weak medium prismatic structure parting to weak medium subangular blocky; firm; common continuous distinct clay films on faces of peds; (E) about 20 percent of matrix consists of intrusions of albic material 0.5 to 2 inches wide that is light gray (10YR 7/1) silt loam; massive; friable; common fine roots mainly in Eg material; few fine pores mainly in Eg material; common medium distinct yellowish brown (10YR 5/6) masses of iron accumulation throughout; light gray (10YR 7/2) clay depletions on faces of prisms; extremely acid; gradual wavy boundary. (10 to 30 cm [4 to 12 in] thick)

Btg1--58 to 99 cm (23 to 39 in); gray (10YR 5/1) silty clay; weak medium prismatic structure parting to strong medium subangular blocky; firm; few fine roots; few fine pores; continuous distinct clay films on faces of peds; about 10 percent of matrix composed of tongues 0.5 to 1 inch wide , interfingers and small pockets of light gray (10YR 7/2) silt loam clay depletions; light gray (10YR 7/2) clay depletions on prism faces; common medium distinct strong brown (7.5YR 5/6) masses of iron accumulation in matrix; extremely acid; gradual smooth boundary. (13 to 46 cm [5 to 18 in] thick)

Btg2--99 to 124 (39 to 49 in); light brownish gray (2.5Y 6/2) silty clay loam; weak medium prismatic structure parting to strong medium subangular blocky; firm; few fine roots; many patchy distinct clay films on faces of peds; small pockets of light gray (10YR 7/2) silt loam clay depletions in matrix and on prism faces; many medium distinct strong brown (7.5YR 5/8) masses of iron accumulation in matrix; extremely acid; gradual smooth boundary. (20 to 33 cm [8 to 13 in] thick)

Btg3--124 to 157 cm (49 to 62 in); light brownish gray (2.5Y 6/2) silt loam; weak coarse prismatic structure parting to moderate medium subangular blocky; firm; few fine roots; common patchy distinct clay films on faces of peds; common medium distinct strong brown (7.5YR 5/8) masses of iron accumulation in matrix; few small dark brown iron-manganese concretions; light gray (10YR 7/2) clay depletions on prism faces and in small pockets in matrix; extremely acid; clear smooth boundary. (25 to 38 cm [10 to 15 in] thick)

Btg4--157 to 183 cm (62 to 72 in); gray (10YR 5/1) silt loam; moderate medium angular blocky structure; firm; few fine roots; few patchy distinct clay films on faces of peds; light gray (10YR 7/2) silt clay depletions in small pockets in matrix; common coarse prominent strong brown (7.5YR 5/8) masses of iron accumulation in matrix; extremely acid.

TYPE LOCATION: Conway County, Arkansas; about 5 miles northwest of Oppelo on Highway 154 and 0.5 mile west on county road in SW1/4NE1/4SW1/4 sec. 6, T. 5 N., R. 17 W.

RANGE IN CHARACTERISTICS:
Solum thickness: 102 cm (40 in) to more than 183 cm (72 in)
Clay content in the Control Section: 35 to 55 percent
Redoximorphic features: Depleted matrix with iron concentrations in shades of brown and yellow throughout the solum.

O Horizon: (where present)
Partially decomposed twigs, leaves and litter

A or Ap Horizon:
Hue: 10YR
Value: 3 to 5
Chroma: 2
Texture: Silt, silt loam, or silty clay loam
Reaction: extremely acid to strongly acid (3.5 to 5.5)

Eg Horizon:
Hue: 10YR or 2.5Y
Value: of 5 to 7
Chroma: 1 or 2
Redoximorphic features: iron accumulation and depletions are in shades of brown and gray
Texture: silt or silt loam
Reaction: extremely acid to strongly acid (3.5 to 5.5)

Btg/E Horizon:
Btg part
Hue: 10YR or 2.5Y
Value: 4 to 7
Chroma: 1 or 2
Texture: silty clay, clay, or silty clay loam
E part
Hue: 10YR, 2.5Y
Value: 5 to 7
Chroma: 1 or 2
Texture: silt or silt loam
Redoximorphic features: iron accumulation and depletions are in shades of brown, yellow, and gray
Reaction: extremely acid to moderately acid (3.5 to 6.0)

Btg Horizon upper part:
Hue: 10YR, 2.5Y
Value: 4 to 7
Chroma: 1 or 2
Redoximorphic features: iron accumulation in shades of brown or yellow
Texture: Silty clay, clay, clay loam, and silty clay loam
Reaction: extremely acid to moderately acid (3.5 to 6.0)

Btg Horizon lower part:
Hue: 10YR, 2.5Y
Value: 4 to 7
Chroma: 1 or 2
Redoximorphic features: iron accumulation in shades of brown or yellow
Texture: silt loam, silty clay loam, silty clay, clay, or clay loam
Reaction: extremely acid to moderately alkaline (3.5 to 8.4)

C Horizon: (where present)
Hue: of 10YR, 2.5Y
Value: 4 to 7
Chroma: 1 or 2
Redoximorphic features: iron accumulation in shades of brown or yellow
Texture: silt loam, silty clay loam, or silty clay
Reaction: extremely acid to moderately alkaline (3.5 to 8.4)

2C Horizon:(where present)
Color: shades of red
Redoximorphic features: iron accumulation are in shades of brown or yellow
Texture: clay or silty clay
Reaction: neutral to moderately alkaline

COMPETING SERIES: There are no other series in the same family.

GEOGRAPHIC SETTING:
Parent material: soil formed in old silty and clayey alluvium
Landscape: Coastal Plain
Landform: soils are on level to depressional areas on old stream terraces
Slope: less than one percent
Mean annual air temperature range: 16 to 18 degrees C (60 to 65 degrees F)
Mean annual precipitation range: 112 to cm (44 to 52 in)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Acadia (LA), Elysian (OK), Foley (AR), Lafe (AR), McKamie (LA), and Muskogee (AR) series.
Acadia soils: are somewhat poorly drained, on slightly higher stream terraces, do not have aquic conditions within a depth of 51 cm (20 in), and do not have a depleted matrix within the upper 13 cm (5 in) of the argillic horizon.
Elysian soils: are moderately well drained, have less clay in the control section, and are on circular mounds on terraces.
Foley soils: have a natric horizon and are on lower sideslope positions on terraces.
Lafe soils: have a natric horizon and are on lower sideslope positions on terraces.
McKamie soils: are well drained, on higher terraces, do not have aquic conditions within a depth of 51 cm (20 in), and do not have a depleted matrix within the upper 13 cm (5 in) of the argillic horizon.
Muskogee soils: are moderately well drained, on higher terraces, do not have aquic conditions within a depth of 51 cm (20 in), and do not have a depleted matrix within the upper 13 cm (5 in) of the argillic horizon.

DRAINAGE AND PERMEABILITY: Wrightsville soils are poorly drained. Runoff is slow and permeability is very slow. The soil is wet in the layers below a depth of 15 to 46 cm (6 to 18 in) and above the Btg horizon during December through April in normal years.

USE AND VEGETATION: Most of these soils are in forest or pasture. Some areas are used for rice, soybeans, and cotton. Native trees are sweetgum, water oak, and willow oak.

DISTRIBUTION AND EXTENT: Western Coastal Plains of Arkansas, Louisiana, Oklahoma, and Texas; MLRA 133B; The series is of large extent with about 500,000 acres.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia

SERIES ESTABLISHED: Pulaski County, Arkansas; 1922.

REMARKS: The series was updated in 2004 to allow clay loam texture in the Btg horizon, and for clay texture to continue into the lower parts of the Btg horizon.

Diagnostic horizons and features recognized in this pedon are:

Ochric epipedon: 0 to 43 cm (0 to 17 in) (A, Eg1 & Eg2 horizons).

Albic horizon: 3 to 43 cm (1 to 17 in) (Eg1 & Eg2 horizons).

Glossic horizon: 43 to 58 cm (17 to 23 in) (Btg & Eg horizon)

Argillic horizon: 43 to 183 cm (17 to 72 in) (Btg & Eg, Btg1, Btg2, Btg3, Btg4 horizons)

National Cooperative Soil Survey
U.S.A.