LOCATION DUBOIS IN+OHEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, active, mesic Aeric Fragiaqualfs
TYPICAL PEDON: Dubois silt loam on a 1 percent slope in a cultivated field at an elevation of about 168 meters (550 feet) above MSL. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 25 cm (0 to 10 inches); brown (10YR 4/3) silt loam, pale brown (10YR 6/3) dry; weak very coarse subangular blocky structure parting to moderate medium granular; friable; common very fine and fine roots; common fine and medium rounded iron and manganese concretions; neutral; clear smooth boundary. (15 to 30 cm or 6 to 12 inches thick)
BE--25 to 43 cm(10 to 17 inches); brownish yellow (10YR 6/6) silt loam; weak medium subangular blocky structure; friable; few very fine roots between peds; few distinct strong brown (7.5YR 4/6) iron stains on faces of peds; common fine faint yellowish brown (10YR 5/6) masses of iron accumulation in the matrix; few fine and medium rounded iron and manganese concretions; many medium prominent light brownish gray (10YR 6/2) iron depletions in the matrix; very strongly acid; clear wavy boundary. ( 0 to 23 cm or 0 to 9 inches thick)
Bt1--43 to 58 cm (17 to 23 inches); light brownish gray (10YR 6/2) silty clay loam; weak medium prismatic structure parting to moderate coarse angular blocky; firm; few very fine roots between peds; common distinct grayish brown (10YR 5/2) clay films on faces of peds; few prominent strong brown (7.5YR 5/6) iron stains on faces of peds; many distinct light gray (10YR 7/2) clay depletions on faces of peds; many medium distinct yellowish brown (10YR 5/4) masses of iron accumulation in the matrix; extremely acid; clear wavy boundary.
Bt2--58 to 97 cm (23 to 38 inches); yellowish brown (10YR 5/4) silty clay loam; moderate medium prismatic structure parting to moderate coarse angular blocky; firm; few very fine roots between peds; many prominent gray (10YR 6/1) clay films on faces of peds; many distinct strong brown (7.5YR 5/6) masses of iron accumulation in the matrix; many fine distinct light brownish gray (10YR 6/2) iron depletions in the matrix; extremely acid; gradual wavy boundary. (Combined thickness of the Bt horizon is 41 to 56 cm or 16 to 22 inches)
2Btx1--97 to 157 cm (38 to 62 inches); dark yellowish brown (10YR 4/6) silt loam; moderate very coarse prismatic structure; very firm; common prominent gray (10YR 6/1), brown (10YR 5/3), and reddish brown (5YR 4/4) clay films on vertical faces of peds; many distinct faint strong brown (7.5YR 4/6) masses of iron accumulation in the matrix; common fine prominent light brownish gray (10YR 6/2) iron depletions in the matrix; brittle; very strongly acid; gradual wavy boundary.
2Btx2--157 to 208 cm (62 to 82 inches); brownish yellow (10YR 6/6) silty clay loam; weak coarse and very coarse prismatic structure; firm; common prominent gray (10YR 5/1) and brown (10YR 4/3) clay films on vertical faces of peds; few prominent reddish brown (5YR 4/4) iron stains on vertical faces of peds; common fine distinct prominent light brownish gray (10YR 6/2) iron depletions in the matrix; brittle; strongly acid; diffuse wavy boundary. (Combined thickness of the Btx horizon is 102 to 122 cm or 40 to 48 inches)
2Bt--208 to 244 cm (82 to 96 inches); strong brown (7.5YR 5/6) silty clay loam; moderate coarse angular blocky structure; very firm; many prominent light brownish gray (10YR 6/2) clay films on faces of peds; common medium faint brownish yellow (10YR 6/6) masses of iron accumulation in the matrix; common medium prominent light gray (10YR 7/2) iron depletions in the matrix; neutral.
TYPE LOCATION: Scott County, Indiana; about 1 mile west of Austin; 725 feet east and 1450 feet south of the northwest corner of sec. 35, T. 4 N., R. 6 E., Scottsburg, Indiana USGS topographic quadrangle; lat. 38 degrees 44 minutes 46 seconds N. and long. 85 degrees 49 minutes 46 seconds W., NAD 27 UTM Zone 16, 601725 easting and 4289259 northing, NAD 83.
RANGE IN CHARACTERISTICS:
Depth to the base of the argillic horizon: 203 cm (80 inches) or more
Depth to a fragipan: 56 to 102 cm (22 to 40 inches)
Ap horizon:
Hue: 10YR
Value: 4 or 5
Chroma: 3 or 4
Texture: silt loam
Clay content: 10 to 26 percent
Sand content: 8 to 20 percent
Reaction: very strongly acid to neutral
A horizon, where present:
Hue: 10YR
Value: 4 or 5
Chroma: 2 or 3
Texture: silt loam
Clay content: 10 to 20 percent
Sand content: 8 to 20 percent
Reaction: very strongly acid or strongly acid
BE or EB horizon:
Hue: 10YR
Value: 5 or 6
Chroma: 2 to 6
Texture: silt loam
Clay content: 15 to 20 percent
Sand content: 8 to 18 percent
Reaction: very strongly acid or strongly acid, and ranges to slightly acid in limed areas
Bt or Btg horizon:
Hue: 10YR or 2.5Y
Value: 5 or 6
Chroma: 1 to 4; where the chroma is 3 or 4, 50 percent or more of the ped faces have a chroma of 2 or less.
Texture: silt loam or silty clay loam
Clay content: 25 to 34 percent
Sand content: 5 to 12 percent
Reaction: extremely acid or very strongly acid
Btx or 2Btx horizon:
Hue: 10YR
Value: 4 to 6
Chroma: 2 to 6
Texture: silt loam or silty clay loam, and less commonly loam
Clay content: 15 to 32 percent
Sand content: 5 to 30 percent
Reaction: very strongly acid or strongly acid, and less commonly extremely acid
2Bt or 2Btg horizon:
Hue: 7.5YR or 10YR
Value: 5 or 6
Chroma: 1 to 8
Texture: commonly silt loam, silty clay loam, loam, or clay loam, and less commonly sandy clay loam
Clay content: 15 to 39 percent
Sand content: 12 to 70 percent
Reaction: strongly acid to neutral
Rock fragment content: 0 to 2 percent gravel
2BC or 2BCg horizon, where present:
Hue: 7.5YR or 10YR
Value: 4 to 6
Chroma: 1 to 6
Texture: silty clay loam, clay loam, loam, silt loam, sandy clay loam, or fine sandy loam
Clay content: 15 to 39 percent
Sand content: 12 to 70 percent
Reaction: strongly acid to neutral
Rock fragment content: 0 to 2 percent gravel
COMPETING SERIES: These are the Bartle, Doles, Patricksburg, Platea, Schaffer, Wadsworth, and Weinbach series. Bartle, Doles, Platea, Wadsworth and Weinbach soils have the depth to the base of the argillic horizon at less than 203 cm (80 inches). Patricksburg soils have a paralithic contact within a depth of 203 cm (80 inches). Platea and Wadsworth soils have free carbonates in the lower part of the series control section. Schaffer soils typically have loam or clay loam textures and have igneous pebbles in the 2Btx horizon, have the lower part of the solum formed in till.
GEOGRAPHIC SETTING: Dubois soils are on lake plains considered to have formed in the Illinoian stage. Slopes range from 0 to 6 percent. These soils formed in 61 to 102 cm (24 to 40 inches) of Wisconsian stage loess and the underlying Illinoian stage paleosol from loamy lacustrine deposits and inter-fingered lacustrine and alluvial deposits. The mean annual air temperature ranges from 11 to 14 degrees C (51 to 57 degrees F), and the mean annual precipitation ranges from 965 to 1143 mm (38 to 45 inches). Frost free period ranges from 170 to 190 days, and the elevation ranges from 137 to 198 meters (450 to 650 feet) above mean sea level.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Haubstadt, Otwell, and Peoga soils on lake plains. The moderately well drained Otwell soils typically are on narrow summits, shoulders and backslopes. The moderately well drained Haubstadt soils typically are on summits, shoulders and backslopes. The poorly drained Peoga soils are on broad flats.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Somewhat poorly drained. The potential for surface water runoff is low or medium. Saturated hydraulic conductivity is moderately high or high (4.23 to 14.11 micrometers/s) in the upper part of the subsoil and low to moderately high (0.07 to 1.41 micrometers/s) in the lower part. Permeability is moderate in the upper part of the subsoil and very slow in the lower part. In undrained areas, depth to a intermittent perched high water table is at a depth of 0.2 to 0.5 meters (0.5 to 1.5 feet) in most years. In drained areas, the depth to the water table is 0.2 to 0.6 meters (0.5 to 2 feet).
USE AND VEGETATION: Most areas are being used to grow cultivated crops, mostly corn and soybeans. A few areas are used for growing small grain, mainly wheat, and for hay and pasture. Native vegetation is mixed hardwood forest.
DISTRIBUTION AND EXTENT: The series is of moderate extent in southern Indiana and of small extent in southwestern Ohio, mainly in MLRA 114. The typical pedon is in MLRA 114A.
MLRA OFFICE RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Pike County, Indiana, 1929.
REMARKS: An undrained phase is recognized. Additional investigation is needed on this soil to determine the properties of the fragipan. Some data and descriptions indicate that the structure and percent brittleness will not meet the criteria for a fragipan.
The representative component and horizon data is in DMU# 124,500.
Diagnostic horizons and features recognized in this pedon are: 1) Ochric epipedon - the zone from the surface of the soil to a depth of approximately 25 cm (10 inches) (Ap horizon); 2) Argillic horizon - the zone from approximately 17 to 96 inches (Bt1, Bt2, 2Btx1, 2Btx2, 2Bt horizons); 3) Fragipan - the zone from approximately 97 to 208 cm (38 to 82 inches) (2Btx1, 2Btx2 horizons); and 4) Redoximorphic features at 25 to 244 cm (10 to 96 inches).
ADDITIONAL DATA: Lab data from National Soil Survey Lab, Lincoln, NE: S89IN143-11 (typical pedon); Agriculture Experiment Station, Purdue University Soil Survey Laboratory: Station Bulletin No. 222, file No. JN7704; Station Bulletin No. 274, JN7813; Station Bulletin No. 175, DU7501.