LOCATION POHOCCO NE+KSEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Typic Eutrudepts
TYPICAL PEDON: Pohocco silty clay loam, on a 12 percent slope in cropland. (Colors are for moist soil unless otherwise noted.)
Ap--0 to 6 inches; dark grayish brown (10YR 4/2) silty clay loam; grayish brown (10YR 5/2) dry; weak fine granular structure; slightly hard, very friable; many fine roots throughout; common fine and medium tubular pores; neutral; abrupt smooth boundary. (3 to 7 inches thick).
Bw--6 to 15 inches; olive brown (2.5Y 4/4) silt loam; light olive brown (2.5Y 5/4) dry; common fine faint grayish brown (2.5Y 5/2), and few distinct yellowish brown (10YR 5/6) iron masses in the matrix; the matrix color and iron accumulations are relict redoximorphic features; weak coarse subangular blocky structure parting to moderate medium granular; slightly hard, friable; many fine roots throughout; common fine and medium tubular pores; few distinct dark grayish brown (10YR 4/2) continuous organic coats on vertical faces of peds; neutral; clear wavy boundary. (7 to 15 inches thick)
Bk1--15 to 20 inches; olive brown (2.5Y 4/4) silt loam; light yellowish brown (2.5Y 6/4) dry; common fine faint grayish brown (2.5Y 5/2), and few prominent strong brown (7.5YR 5/6) iron masses in the matrix; the matrix color and iron accumulations are relict redoximorphic features; weak coarse subangular blocky structure parting to moderate medium granular; slightly hard, friable; few fine roots throughout; common fine tubular pores; common fine and medium soft masses of carbonates; violent effervescence; slightly alkaline; gradual smooth boundary.
Bk2--20 to 28 inches; olive brown (2.5Y 4/4) crushed silt loam; light yellowish brown (2.5Y 6/4) crushed dry; common medium faint grayish brown (2.5Y 5/2), and few prominent strong brown (7.5YR 5/8) mottles; weak coarse subangular blocky structure parting to moderate medium granular; friable; few fine roots throughout; common fine tubular pores; few fine rounded soft masses of iron-manganese; fine and medium soft masses of carbonates; violent effervescence; slightly alkaline (7.6); gradual smooth boundary. (Combined thickness of Bw and Bk1 horizons is 10 to 24 inches.)
C--28 to 60 inches; light olive brown (2.5Y 5/4) silt loam, pale yellow (2.5Y 7/4) dry; common coarse faint light brownish gray (2.5Y 6/2), and few prominent yellowish red (5YR 5/8) iron masses in the matrix; the matrix color and iron accumulations are relict redoximorphic features; massive; slightly hard, friable; few fine roots throughout; common fine tubular pores; common fine rounded soft masses of iron-manganese; few medium soft masses of carbonates and carbonate nodules; violent effervescence; slightly alkaline (7.5).
TYPE LOCATION: Saunders County, Nebraska; about 4 miles north and 2 miles west of Prague; located about 2325 feet west and 300 feet south of the northeast corner of section 16, T. 16 N., R. 5 E.; Prague USGS quad; lat. 41 degrees, 21 minutes, 52 seconds N. and long. 96 degrees, 51 minutes, 33 seconds W.
RANGE IN CHARACTERISTICS:
Soil moisture: Udic moisture regime.
Depth to secondary calcium carbonate: 12 to 40 inches
Depth to cambic horizon: 3 to 7 inches
Thickness of the Solum: 20 to 46 inches
Note: The matrix color and iron accumulations are a relic feature and not indicative of present drainage conditions.
Particle-size control section (weighted average):
Clay content: 20 to 30 percent
A horizon:
Hue: 10YR or 2.5Y
Value: 3 or 4 (5 or 6 dry)
Chroma: 2 through 4
Texture: silty clay loam or silt loam
Clay content: 20 to 35 percent
Reaction: slightly acid to slightly alkaline
Thickness: When mollic colors are present the thickness is less than 4 inches
Bw horizon:
Hue: 10YR through 5Y
Value: 4 through 6 (5 through 7 dry)
Chroma: 2 through 4
Texture: silty clay loam or silt loam
Clay content: 20 to 35 percent
Reaction: neutral to slightly alkaline
Bk horizon:
Hue: 10YR through 5Y
Value: 4 through 6 (5 through 7 dry)
Chroma: 2 through 4
Texture: silt loam
Clay content: 20 to 27 percent
Calcium carbonate equivalent: 0 to 5 percent
Reaction: neutral to slightly alkaline
C horizon:
Hue: 7.5YR through 5Y
Value: 4 through 6 (5 through 7 dry)
Chroma: 2 through 6
Texture: silt loam
Clay content: 20 to 27 percent
Calcium carbonate equivalent: 1 to 10 percent
Reaction: slightly alkaline or moderately alkaline
COMPETING SERIES: There are no other series in this family.
Other similar soils are the:
Contrary,
Drury,
Exette and
Killduff series which have carbonates below 40 inches.
Drury soils do not have relict redoximorphic features in the upper B horizon and formed in alluvium.
GEOGRAPHIC SETTING:
Parent material: loess
Landform: side slopes and ridges
Slopes: 2 to 30 percent
Elevation: 1200 to 1600 feet
Mean annual temperature: 49 to 55 degrees F
Mean annual precipitation: 26 to 35 inches
Frost-free period: 160 to 170 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the:
Aksarben soils have a mollic epipedon, have an argillic horizon and are on slightly higher, less sloping positions on the landscape.
Ida soils contain less clay, do not have a cambic horizons and are on the same type of landscape.
Judson soils have mollic epipedons more than 24 inches thick and are in colluvial positions below the Pohocco soils.
DRAINAGE AND PERMEABILITY:
Drainage: Well drained
Permeability: Moderate permeability
Surface runoff: Medium or high
USE AND VEGETATION: Most areas of Pohocco soils are in cropland. Corn, soybeans, grain sorghum and winter wheat are the principle crops.
DISTRIBUTION AND EXTENT: Eastern Nebraska and northeastern Kansas; LRR M Central Feed Grains and Livestock Region, MLRA 106 Nebraska and Kansas Loess Drift Hills and MLRA 107 Iowa and Missouri Deep Loess Hills; moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Brown County, Kansas, 1994.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 10 to 40 inches. (Bw and Bk horizons)
ochric epipedon: The zone from 0 to 6 inches. (Ap horizon)
cambic horizon: The zone from 6 to 15 inches. (Bw horizon)
Redoximorphic concentrations: (Bw, Bk, and C horizons)
6/00 changed reaction range in A horizon to include slightly acid. Added clay content and calcium carbonate equivalent to Range in Characteristics from Soil Interpretation Record. Added Frost Free Period to Geographic Setting from Soil Interpretation Record.
ADDITIONAL DATA: The Pohocco soils originally classified as fine-silty, mixed, mesic Typic Hapludolls. However, because of severe erosion, these soils no longer have the thick, dark surface layer necessary for this classification.