LOCATION PEOGA IN+KY OH

Established Series
Rev. BGN
11/2021

PEOGA SERIES

The Peoga series consists of very deep, poorly drained soils formed in loess and the underlying loamy lacustrine or alluvial sediments. They are on lake plains and stream terraces. Slope ranges from 0 to 1 percent. Mean annual precipitation is about 1092 mm (43 inches), and mean annual temperature is about 12 degrees C (54 degrees F).

TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Fragic Epiaqualfs

TYPICAL PEDON: Peoga silt loam, on a level slope in a cultivated field at an elevation of 165 meters (540 feet) above MSL. (Colors are for moist soil unless otherwise stated.)

Ap--0 to 20 cm (8 inches); light brownish gray (10YR 6/2) silt loam, light gray (10YR 7/1) dry; weak coarse subangular blocky structure parting to moderate medium granular; friable; few very fine roots; many fine faint brown (10YR 5/3) masses of oxidized iron in the matrix; common prominent yellowish red (5YR 5/6) pore linings throughout; common fine prominent black (N 2.5/) mangans; krotovinas filled with brown (10YR 5/3) material; moderately acid; abrupt smooth boundary. [20 to 28 cm (8 to 11 inches) thick]

BEg--20 to 48 cm (8 to 19 inches); light gray (10YR 7/2) silt loam; weak medium subangular blocky structure; friable; few very fine roots throughout; common fine prominent reddish yellow (7.5YR 6/8) and common medium prominent brownish yellow (10YR 6/6) masses of oxidized iron in the matrix; common fine prominent black (N 2.5/) mangans in pores and root channels; krotovinas filled with brown (10YR 5/3) material; very strongly acid; gradual wavy boundary. [13 to 51 cm (5 to 20 inches) thick]

Btg1--48 to 69 cm (19 to 27 inches); light gray (10YR 7/2) silt loam; weak coarse prismatic structure parting to weak medium subangular blocky; friable; few very fine roots throughout; common distinct light brownish gray (10YR 6/2) clay films on vertical faces of peds; common fine prominent reddish yellow (7.5YR 6/8) and common medium prominent brownish yellow (10YR 6/6) masses of oxidized iron in the matrix; common fine prominent black (N 2.5/) mangans on vertical faces of peds; krotovinas filled with brown (10YR 5/3) material; very strongly acid; gradual wavy boundary.

Btg2--69 to 91 cm (27 to 36 inches); light gray (10YR 7/2) silt loam; moderate coarse prismatic structure parting to moderate coarse subangular blocky; friable; few very fine roots between peds; many distinct light brownish gray (10YR 6/2) clay films on vertical faces of peds; common fine prominent reddish yellow (7.5YR 6/8) and common medium prominent light yellowish brown (10YR 6/4) masses of oxidized iron in the matrix; common fine prominent black (N 2.5/) mangans on vertical faces of peds; krotovinas filled with brown (10YR 5/3) material; very strongly acid; gradual irregular boundary. [Combined thickness of the Btg horizons is 25 to 69 cm (10 to 27 inches).]

Btgx1--91 to 147 cm (36 to 58 inches); 65 percent light gray (10YR 7/2) and 35 percent strong brown (7.5YR 5/6) silt loam; moderate coarse prismatic structure; firm; many distinct light brownish gray (10YR 6/2) clay films on vertical faces of peds; common medium distinct light yellowish brown (10YR 6/4) masses of oxidized iron in the matrix; common fine prominent black (N 2.5/) mangans on vertical faces of peds; 35 percent brittle; very strongly acid; gradual wavy boundary.

Btgx2--147 to 193 cm (58 to 76 inches); 65 percent light gray (10YR 7/2) and 35 percent yellowish brown (10YR 5/6) silt loam; moderate coarse prismatic structure; firm; common prominent light brownish gray (10YR 6/2) clay films on vertical faces of peds; 35 percent brittle; strongly acid; diffuse wavy boundary. [Combined thickness of the Btgx horizons is 69 to 102 cm (27 to 40 inches).]

2Btb--193 to 203 cm (76 to 80 inches); strong brown (7.5YR 5/6) silty clay loam; moderate coarse subangular blocky structure; firm; common distinct light brownish gray (10YR 6/2) clay films on vertical and horizontal faces of peds; few fine faint yellowish red (5YR 5/6) masses of oxidized iron in the matrix; common coarse irregular iron-manganese concretions; many medium prominent light gray (10YR 7/2) iron depletions in the matrix; strongly acid.

TYPE LOCATION: Scott County, Indiana; about 2 miles northeast of Austin; 1,810 feet east and 645 feet north of the center of section 18, T. 4 N., R. 7 E.; USGS Crothersville, IN topographic quadrangle; lat. 38 degrees 47 minutes 18.021 seconds N. and long. 85 degrees 46 minutes 44.953 seconds W; UTM Zone 16, 606032 easting and 4293995 northing, NAD 83.

RANGE IN CHARACTERISTICS:
Thickness of the loess: 51 to 102 cm (20 to 40 inches)
Depth to a layer with fragic soil properties: 76 to 114 cm (30 to 45 inches)
Depth to the base of the argillic horizon: 140 to more than 203 cm (55 to more than 80 inches)
Particle-size control section: averages 20 to 32 percent clay and 5 to 15 percent fine and coarser sand

Ap horizon:
Value: 4 to 6
Chroma: 1 to 3
Texture: silt loam
Reaction: very strongly acid to neutral

A horizon:
Value: 4 to 6
Chroma: 1 or 2
Texture: silt loam
Reaction: very strongly acid or very strongly acid

Eg, EBg, or BEg horizon:
Hue: 10YR or 2.5Y
Value: 5 to 7
Chroma: 1 or 2
Texture: silt loam
Clay content: 14 to 22 percent
Sand content: 2 to 20 percent
Reaction: extremely acid to strongly acid

Btg, Bt, Btgx, or Btx horizons:
Hue: 7.5YR to 5Y
Value: 5 to 7
Chroma: 1 to 6 (horizons with chroma of 4 to 6 are below a depth of 91 cm (36 inches))
Texture: silt loam or silty clay loam, and includes loam or clay loam in the lower part
Clay content: 18 to 34 percent
Sand content: 5 to 25 percent
Brittleness: 30 to 50 percent brittle by volume in the Btx or Btgx horizon
Rock fragments: 0 to 2 percent gravel
Reaction: extremely acid to strongly acid, and ranges to moderately acid in the lower part

2Btg or 2Btb horizons:
Hue: 7.5YR or 10YR
Value: 5
Chroma: 1 to 6
Texture: silt loam, silty clay loam, loam or clay loam
Clay content: 22 to 34 percent
Sand content: 5 to 45 percent
Rock fragments: 0 to 2 percent gravel
Reaction: strongly acid to neutral

BC, BCg, C or Cg horizon, where present:
Hue: 7.5YR to 5Y
Value: 4 to 7
Chroma: 1 to 4
Texture: silty clay loam, silt loam, clay loam, loam, sandy clay loam, fine sandy loam, or sandy loam Reaction: commonly strongly acid to slightly acid, and ranges to neutral

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

GEOGRAPHIC SETTING: The Peoga soils are dominantly on flats of lake plains and to a lesser extent on treads of stream terraces. Slope ranges from 0 to 1 percent. They formed in 51 to 102 cm (20 to 40 inches) of loess and the underlying paleosol from loamy lacustrine sediments, or loess and the underlying alluvial sediments. Mean annual precipitation ranges from 965 to 1168 mm (38 to 46 inches). Mean annual air temperature ranges from 10 to 14 degrees C (51 to 57 degrees F). Frost-free period is 170 to 190 days. Elevation is 122 to 244 meters (400 to 800 feet) above mean sea level.

GEOGRAPHICALLY ASSOCIATED SOILS: Dominantly, these are the Dubois, Haubstadt, and Otwell soils on lake plains. The somewhat poorly drained Dubois soils are on nearly level to gently sloping summits and shoulders. The moderately well drained Haubstadt soils and the moderately well drained Otwell soils are on summits, shoulders and backslopes. To a minor extent, Peoga soils are associated with the Bartle and Pekin soils on stream terraces. The somewhat poorly drained Bartle soils are on slightly higher lying parts of treads. The moderately well drained Pekin soils are on dominantly on gently sloping parts of treads and on risers.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Poorly drained. In undrained areas, the depth to the top of a perched seasonal high water table ranges from 15 cm (0.5 feet) above the surface to 15 cm (0.5 feet) below the surface between November and June in normal years. In drained areas, the depth to the top of the perched seasonal high water table ranges from 15 cm (0.5 foot) above the surface to 30 cm (1 foot) below the surface between December and May in normal years. The potential for surface water runoff is low or negligible. Saturated hydraulic conductivity is moderately low or moderately high in the upper part of the solum and low to moderately high in the lower part. Permeability is moderate in the upper part of the solum and slow or very slow in the lower part.

USE AND VEGETATION: Most areas are used for growing cultivated crops, mainly corn and soybeans. Several areas are in forest. A few areas are used to grow wheat, or used for hay and pasture. Native vegetation is mixed deciduous forest.

DISTRIBUTION AND EXTENT: MLRAs 114A, 114B, 115A, 120B, 122, 124, and 126 in southern Indiana, southwestern Kentucky, and southern and east-central Ohio. The type location is in MLRA 114A. This series is of moderate extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: AMHERST, MASSACHUSETTS

SERIES ESTABLISHED: Morgan County, Indiana, 1937.

REMARKS: Undrained and clayey substratum phases are recognized. The clayey substratum phase will become a new series when the subsets containing it are updated. In 1995, the type location was moved to Scott County to better represent the series concept.

Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: from the surface of the soil to a depth of 48 cm (19 inches) (Ap, BEg horizons).
Argillic horizon: from 48 to 203 cm (19 to 80 inches) (Btg1, Btg2, Btgx1, Btgx2, 2Btb horizons).
Redoximorphic features: from 0 to 203 cm (80 inches).

ADDITIONAL DATA: Lab characterization data available; S90IN-143-2 (typical pedon) at the National Soil Survey Lab in Lincoln, NE. Data published in Agricultural Experiment Station Bulletins, Purdue University, S67IN-14-002, S75IN-105-5, S77IN-21-15, S77IN-71-5, S78IN-71-15, S79IN-55-1 and S84IN-51-10.

National Cooperative Soil Survey
U.S.A.