LOCATION DORCHEAT LA+AR
Established Series
MJB
09/2020
DORCHEAT SERIES
The Dorcheat series consists of very deep, somewhat poorly drained soils. These nearly level to gently sloping soils formed in loamy and clayey alluvium of late Pleistocene age. Slope ranges from 0 to 3 percent, but are dominantly 0 to 2 percent. Mean annual air temperature is about 17.2 degrees C (63 degrees F), and mean annual precipitation is about 1372 mm (54 in).
TAXONOMIC CLASS: Fine, smectitic, thermic Aeric Epiaqualfs
TYPICAL PEDON: Dorcheat silt loam, 0 to 2 percent slopes-in woodland; on a 0.5 percent slope; elevation is 77.2 meters (254 ft). (Colors are for moist soil unless otherwise stated.)
A--0 to 8 centimeters (0 to 3 in); dark grayish brown (10YR 4/2) silt loam; weak fine granular structure; friable; very strongly acid; clear smooth boundary. (Thickness of the A horizon is 7 to 26 cm [3 to 10 in])
BE--8 to 27 centimeters (3 to 11 in); 60 percent yellowish brown (10YR 5/6) and 40 percent grayish brown (10YR 5/2) silt loam; weak medium subangular blocky structure; friable; common fine roots; common fine tubular pores; 1 percent fine distinct dark yellowish brown (10YR 4/4) masses of oxidized iron with sharp boundaries on surfaces along root channels; very strongly acid; gradual wavy boundary. (Thickness of the BE horizon is 10 to 72 cm [4 to 28 in])
Btg1--27 to 44 centimeters (11 to 17 in); 80 percent grayish brown (10YR 5/2) and 20 percent yellowish brown (10YR 5/6) silty clay loam; weak fine and medium subangular blocky structure; firm; few fine roots; few fine tubular pores; 15 percent distinct clay films on all faces of peds; 8 percent medium prominent strong brown (7.5YR 5/6) masses of oxidized iron with sharp boundaries in matrix; very strongly acid; gradual wavy boundary.
Btg2--44 to 80 centimeters (17 to 31 in); 50 percent grayish brown (10YR 5/2) and 50 percent strong brown (7.5YR 5/6) silty clay; moderate fine and medium subangular blocky structure; very firm; few fine roots; 50 percent distinct clay films on all faces of peds; 5 percent fine prominent yellowish brown (10YR 5/6) masses of oxidized iron with sharp boundaries in matrix; 5 percent medium prominent yellowish brown (10YR 5/6) masses of oxidized iron with sharp boundaries in matrix; very strongly acid; gradual wavy boundary. (Combined thickness of the Btg horizon is 51 to 152 cm [20 to 60 in])
2Bt1--80 to 99 centimeters (31 to 39 in); yellowish brown (10YR 5/6) silty clay; moderate medium subangular blocky; very firm; few fine roots between peds; 50 percent distinct clay films on all faces of peds; 4 percent strong brown (7.5YR 5/6) redox concentrations with sharp boundaries in matrix; 2 percent medium prominent yellowish red (5YR 4/6) masses of oxidized iron with sharp boundaries in matrix; 20 percent grayish brown (10YR 5/2) redox depletions with diffuse boundaries in matrix; very strongly acid; gradual wavy boundary.
2Bt2--99 to 168 cm (39 to 66 in); yellowish brown (10YR 5/6) silty clay; moderate medium angular blocky structure; very firm; 30 percent prominent clay films on faces of peds; 4 percent prominent yellowish red (5YR 4/6) masses of oxidized iron with sharp boundaries in matrix; 3 percent prominent strong brown (7.5YR 5/6) masses of oxidized iron with sharp boundaries in matrix; 5 percent distinct grayish brown (10YR 5/2) masses of reduced iron with diffuse boundaries in matrix; gradual wavy boundary; very strongly acid. (Combined thickness of the 2Bt horizon is 0 to 99 cm [0 to 39 in])
3BC--168 to 203 centimeters (66 to 80 in); yellowish red (5YR 4/6) silty clay; weak coarse subangular blocky structure; very firm; 3 percent prominent black (10YR 2/1) stains on ped faces; 1 percent soft black (10YR 2/1) nodules; slightly acid.
TYPE LOCATION: Lafayette County, AR; about 12.4 miles south of Lewisville, AR. on state highway 29; turn east on State Hwy 360 for 1.6 miles to County Rd 52, turn right on county road 52 for 0.47 miles; about 60 ft NE of edge of county road 52 in wooded area.
USGS Topographic Quadrangle: Bradley NE
Latitude: 33 degrees 10 minutes 55.344 seconds N
Longitude: 93 degrees 36 minutes 3.96 seconds W
Decimal Degrees:
Latitude: 33.18204 degrees
Longitude: 93.60110 degrees
Datum: NAD83
RANGE IN CHARACTERISTICS:
Soil Moisture: An aquic soil moisture regime.
Mean annual soil temperature: 19.9 to 21.7 degrees C (68 to 71 degrees F)
Depth to episaturation: 0 to 44 cm (0 to 17 in) from December to June
Depth to redox concentrations: 8 to 203 cm (3 to 80 in)
Particle-size control section (weighted average)
Clay content: 35 to 55 percent
Sand content: 3 to 8 percent
A or Ap horizon (where present):
Hue: 10YR
Value: 4 to 6
Chroma: 2 or 3
Texture: loam or silt loam
Redox concentrations: amount-0 to 8 percent; size-fine to medium; contrast-faint, distinct, or prominent; color-shades of brown; boundary-sharp; location-along root channels and in matrix
Redox depletions: amount-0 to 2 percent; size-fine; contrast-faint; color-shades of gray; boundary-clear; location-in matrix surrounding redox concentrations
Reaction (pH): very strongly acid to moderately acid (4.5 to 6.0)
E or Eg horizon (where present):
Hue: 10YR or 2.5Y
Value: 4 to 7
Chroma: 2 to 4
Texture: loam, silt loam, or silty clay loam
Redox concentrations: amount-0 to 40 percent; size-fine to medium; contrast-faint, distinct, or prominent; color-shades of brown; boundary-sharp; location-along root channels and in matrix
Redox depletions: amount-0 to 10 percent; size-fine; contrast-faint; color-shades of gray; boundary-clear; location-in matrix surrounding redox concentrations
Reaction (pH): very strongly acid to moderately acid (4.5 to 6.0)
BE or BEg horizon (where present):
Hue: 10YR or 2.5Y
Value: 4 to 7
Chroma: 2 to 8
Texture: silt loam, silty clay loam, or clay loam
Clay films: location-on all faces of peds; contrast-distinct
Redox concentrations: amount-1 to 50 percent; size-fine to medium; contrast-faint, distinct, or prominent; color-shades of brown; boundary-sharp; location-pore linings and in matrix
Redox depletions: amount-1 to 8 percent; size-fine; contrast-faint to distinct; color-shades of gray; boundary-clear; location-in matrix
Glossic material: 0 to 5 percent
Reaction (pH): very strongly acid or strongly acid (4.5 to 6.0)
Btg horizon:
Hue: 10YR or 2.5Y
Value: 4 or 6
Chroma: 1 to 6
Texture: silty clay loam, silty clay or clay
Clay films: location-on all faces of peds; contrast-distinct
Redox concentrations: amount-8 to 35 percent; size-fine to medium; contrast-faint to prominent; contrast-distinct or prominent; color-shades of red, yellow or brown; boundary-sharp; location-in matrix
Redox depletions: amount-0 to 10 percent; size-fine to medium; contrast-faint to distinct; color-shades of gray; location-in matrix
Reaction (pH): very strongly acid to moderately acid (4.5 to 6.0)
Btg/E (where present):
Btg part:
Hue: 10YR or 2.5Y
Value: 4 or 6
Chroma: 1 to 2
Texture: silty clay loam, silty clay or clay
Clay films: location-on all faces of peds; contrast-distinct
Redox concentrations: amount-8 to 35 percent; size-fine to medium; contrast-faint to prominent; contrast-distinct or prominent; color-shades of red, yellow or brown; boundary-sharp; location-in matrix
Redox depletions: amount-0 to 10 percent; size-fine to medium; contrast-faint to distinct; color-shades of gray; location-in matrix
Reaction (pH): very strongly acid to moderately acid (4.5 to 6.0)
E part (occurs as browner structural units in the matrix):
Hue: 10YR or 2.5Y
Value: 4 to 6
Chroma: 4 to 6
Texture: silt loam or silty clay loam
Redox concentrations: amount-3 to 5 percent; size-fine to medium; contrast-distinct; contrast-distinct or prominent; color-shades of red, yellow or brown; boundary-sharp; location-in matrix
Redox depletions: amount-1 to 8 percent; size-fine to medium; contrast-faint to distinct; color-shades of gray; boundary-diffused; location-in matrix
2Bt horizon:
Hue: 10YR or 2.5Y
Value: 5 or 6
Chroma: 3 to 6
Texture: silty clay loam, silty clay or clay
Clay films: location-on all faces of peds; contrast-distinct
Redox concentrations: amount-8 to 35 percent; size-fine to medium; contrast-distinct or prominent; contrast-distinct or prominent; color-shades of red, yellow or brown; boundary-sharp; location-in matrix
Redox depletions: amount-0 to 20 percent; size-fine; contrast-faint to distinct; color-shades of gray; boundary-clear; location-in matrix
Glossic material: 0 to 5 percent
Reaction (pH): very strongly acid to moderately acid (4.5 to 6.0)
2BCtg horizon (where present):
Hue: 10YR or 2.5Y
Value: 5 or 6
Chroma: 1 to 2
Texture: silt loam, silty clay loam, silty clay or clay
Clay film: location-on all faces of peds; faint to distinct
Redox concentrations: amount-5 to 35 percent; size-fine to medium; contrast-distinct or prominent; color-shades of red, yellow or brown; boundary-sharp; location-in matrix
Redox depletions: amount-0 to 10 percent; size-fine; contrast-faint to distinct; color-shades of gray; boundary-clear; location-in matrix
Reaction (pH): very strongly acid to slightly alkaline (4.5 to 7.8)
3BC or 3C horizon (where present):
Hue: 2.5YR to 10YR
Value: 4 or 8
Chroma: 2 to 8
Texture: silty clay loam, silty clay or clay
Redox concentrations: amount-0 to 10 percent; size-fine to medium; contrast-distinct or prominent; color-shades of red, yellow or brown; boundary-sharp; location-in matrix
Redox depletions: amount-3 to 20 percent; size-fine; contrast-faint to distinct; color-shades of gray; boundary-clear; location-in matrix surrounding redox concentrations
Iron manganese segregations: amount-0 to 12 percent; kind-masses
Reaction (pH): strongly acid to slightly alkaline (5.0 to 7.8)
COMPETING SERIES: There are no series in the same family. Similar soils include the
Acadia (LA),
Acadiana (LA),
Huntsburg, (TX), and
Searcy (AL),
Stigler (OK), and
Tamaha (OK), and
Texla (TX) series.
Acadia soils: higher average rainfall and frost-free days; occur at lower elevations on coastal prairies and flatwoods
Acadiana and
Texla soils: do not have aquic conditions in the upper 76 cm (30 in)
Tamaha soils: average annual rainfall of 1092 mm (43 in); moderately well drained
Huntsburg soils: moderately well drained; loamy fine sand surface horizon texture
Searcy soils: greater amount of sand in the surface horizon; moderately well drained; mixed mineralogy
Stigler soils: formed in loamy and clayey colluvium over interbedded shale and sandstone; average annual rainfall of 1092 mm (43 in); mixed mineralogy
GEOGRAPHIC SETTING:
Parent material: late Pleistocene age loamy and clayey alluvium
Landscape: flat coastal plains
Landform: terraces
Slope: 0 to 3 percent but dominantly from 0 to 2percent
Mean annual precipitation: 1143 to 1499 mm (45 to 59 in)
Precipitation Pattern: mostly uniform throughout the year with slight peaks in the spring and fall months
Mean annual air temperature: 14.4 to 20.0 degrees C (58 to 68 degrees F)
Frost-free period: 200 to 300 days
Elevation: 15.2 to 82 m (50 to 270 ft)
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Ashford (LA),
Gore (LA)
Kolin (LA),
Muskogee (OK), and
Wrightsville (AR) series.
Ashford soils: have gray matrix colors throughout, are poorly drained and have vertic properties and occur in similar positions
Gore soils: have redder colors in the upper part of the solumn and occur on terrace risers
Kolin and
Muskogee soils: have less than 35 percent clay in the control section and occur on terrace risers
Wrightsville soils: have intrusions of albic materials in the Bt horizon, have gray matrix colors throughout the sola and occur in depressional areas on old stream terraces
DRAINAGE AND PERMEABILITY:
Drainage: somewhat poorly
Permeability: very slow
Runoff: high on slopes less than 1 percent and very high on slope greater than 1 percent
Episaturation: these soils are saturated to within 15 cm to 50 cm (0.5 to 1.6 ft) of the surface from December through April in normal years
USE AND VEGETATION:
Major uses: About half of the acreage is cleared and used for growing crops and pasture, the other half is in forest, part of which is grazed
Native vegetation: Main crops are rice, soybeans, and sweet potatoes. Pasture grasses are varieties of bermudagrass, and bahiagrass
Ecological sites assigned to phases and components of this series are listed below. Current ecological site assignments are in Web Soil Survey. Components of this series include the following ecological sites: Wet Terrace
DISTRIBUTION AND EXTENT:
General area: Arkansas, Louisiana
Land Resource Region: Land Resource Region: P-South Atlantic and Gulf Slope Cash Crops, Forest, and Livestock Region
MLRA 133B-Western Coastal Plain
Extent: large
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Lafayette County, Arkansas; 2017.
REMARKS:
The Dorcheat series was established to replace the Acadia soil series in MLRA 133B-Western Coastal Plains. The Acadia series was originally set up in MLRA 150A-Gulf Coast Prairies and correlated in MLRA's 150A, 152B-Western Gulf Coast Flatwoods and 133B-Western Coastal Plains. With such variations in the climatic environment, it was decided that a new series was needed to accommodate those soils in MLRA 133B.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: 0 to 27 cm (0 to 11 in) (A,BE horizons)
Argillic horizon: 27 to 168 cm (11 to 66 in) (Btg, Btg/E, 2Bthorizons)
Redox concentrations: 8 to 203 cm (3 to 80 in) (BE, Btg/E, 2Bt, 3BC horizons)
Redox depletions: 8 to 203cm (3 to 203 in) (BE, Btg/E, 2Bt, 3BC horizons)
Aquic conditions: 0 to 44 cm (0 to 17 in) (A, BE, Btg/E1)
Episaturation: 0 to 44 cm (0 to 17 in) (A, BE, Btg/E)
Reduced Matrix: 27 to 80 cm (11 to 31 in) (BE, Btg/E horizons)
ADDITIONAL DATA: KSSL sample S2017AR073001
TAXONOMIC VERSION: Keys to Soil Taxonomy, 12th Edition, 2014
National Cooperative Soil Survey
U.S.A.