LOCATION EDGINGTON IL

Established Series
Rev. GOW-BWR-DCH-AAC
01/2011

EDGINGTON SERIES

The Edgington series consists of very deep, poorly drained, moderately slowly to slowly permeable soils on nearly level or depressional upland positions. They formed in loess. Slope ranges from 0 to 2 percent. Mean annual precipitation is about 940 mm (37 inches), and mean annual temperature is about 10 degrees C (50 degrees F).

TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Argiaquic Argialbolls

TYPICAL PEDON: Edgington silt loam at an elevation of 274.4 meters (900 feet) above mean sea level. (Colors are for moist soil unless otherwise stated.)

A1--0 to 41 cm (0 to 16 inches); black (10YR 2/1) silt loam; moderate medium granular structure; friable; many roots; slightly acid; gradual smooth boundary.

A2--41 to 51 cm (16 to 20 inches); very dark brown (10YR 2/2) and very dark grayish brown (10YR 3/2) silt loam; moderate medium granular structure; friable; many roots; strongly acid; clear smooth boundary. [Combined thickness of the A horizon is 38 to 61 cm (15 to 24 inches).]

E--51 to 79 cm (20 to 31 inches); dark grayish brown (10YR 4/2) and grayish brown (10YR 5/2) silt loam; weak medium platy structure parting to weak fine granular; friable; common roots; few fine distinct dark yellowish brown (10YR 4/4) iron masses in the matrix; common black (10YR 2/1) iron and manganese oxide nodules and concretions throughout; strongly acid; clear smooth boundary. [19 to 31 cm 97 to 12 inches) thick]

Btg1--79 to 89 cm (31 to 35 inches); dark gray (5Y 4/1) silty clay loam; moderate fine subangular blocky structure; friable; few roots; few distinct dark gray (10YR 4/1) clay films on faces of peds: few fine prominent yellowish brown (10YR 5/4) iron masses in the matrix; common prominent black (10YR 2/1) iron and manganese oxide nodules and concretions throughout; strongly acid; gradual smooth boundary.

Btg2--89 to 104 cm (35 to 41 inches); gray (10YR 5/1) silty clay loam; weak medium prismatic structure parting to moderate strong fine and medium angular blocky; firm; few roots; common faint dark gray (10YR 4/1) clay films on faces of peds; few fine distinct dark yellowish brown (10YR 4/4) and few fine prominent yellowish brown (10YR 5/6) iron masses in the matrix; common black (10YR 2/1) iron and manganese oxide nodules and concretions throughout; moderately acid; gradual smooth boundary.

Btg3--104 to 125 cm (41 to 49 inches); gray (10YR 5/1) silty clay loam; weak medium and coarse prismatic structure parting to strong medium angular blocky; firm; few roots; common faint dark gray (10YR 4/1) and very dark gray (10YR 3/1) clay films on faces of peds; common fine prominent brown (7.5YR 4/4) and yellowish brown (10YR 5/6) iron masses in the matrix; common black (10YR 2/1) iron and manganese oxide nodules and concretions throughout; moderately acid; clear smooth boundary.

Btg4--125 to 140 cm (49 to 55 inches); gray (10YR 5/1) and light brownish gray (10YR 6/2) silty clay loam; weak medium and coarse angular blocky structure; firm; few roots; common faint dark gray (10YR 4/1) clay films on faces of peds; many fine prominent brown (7.5YR 4/4) and strong brown (7.5YR 5/6) iron masses in the matrix; common black (10YR 2/1) iron and manganese oxide nodules and concretions throughout; very dark gray (10YR 3/1) krotovina crosses horizon; moderately acid; gradual smooth boundary. [Combined thickness of the Bt horizon is 51 to 76 cm (20 to 30 inches).]

Cg--140 to 152 cm (55 to 60 inches); gray (10YR 5/1), yellowish brown (10YR 5/6) and light brownish gray (10YR 6/2) silt loam; massive; friable; few distinct dark brown (7.5YR 3/2) redox concentrations; slightly acid.

TYPE LOCATION: Carroll County, Illinois; about 3 miles northeast of Shannon, 222 feet west and 45 feet north of southeast corner of NE 1/4, sec. 5, T. 25 N., R. 7 E. USGS Shannon quadrangle; elevation 898 feet; latitude 42 degrees, 11 minutes, 30.1 seconds N., longitude 89 degrees, 42 minutes, 31 seconds W; UTM Zone 16T 0276339E 4674398N; NAD 27.

RANGE IN CHARACTERISTICS:
Thickness of the solum: 114 to 179 cm (45 to 70 inches), solum is formed entirely in loess.
Average content of sand: less than 10 percent throughout
Thickness of the albic horizon: less than 31 cm (12 inches)
Depth to the top of the argillic horizon: 61 to 91 cm (24 to 36 inches)

Ap or A horizon:
Hue: 10YR
Value: 2 or 3
Chroma: 1 or 2
Texture: silt loam

E or Eg horizon:
Hue; 10YR
Value: 4 or 5
Chroma: 1 or 2
Texture: silt loam
Other features: Redox concentrations have chroma of 3 to 6.
Reaction: strongly acid to moderately acid

Bt or Btg horizon:
Hue: 10YR, 2.5Y or 5Y
Value: 4 to 6
Chroma: 1 or 2
Texture: dominantly silty clay loam, but silt loam subhorizons are in the upper or lower part, or both.
Other features: It has redox features of 7.5YR or 10YR hue and higher chroma.
Reaction: strongly acid to slightly acid in the Bt horizon

Cg horizon:
Hue: 10YR
Value: 5 or 6
Chroma: 1 to 6
Texture: silt loam
Reaction: slightly acid to slightly alkaline

COMPETING SERIES: These are the Corley, Ebbert, Knight, Marissa, Normal, Speed, Thorp and Vesser series. Corley soils have part of the mollic epipedon below the albic horizon. Ebbert, Marissa and Normal soils are less than 61 cm (24 inches) to the top of the argillic horizon. Knight and Thorp soils contain more than 10 percent sand in the lower part of the series control section. Speed soils have mean annual soil temperature of more than 12.8 degrees C (55 degrees F) in the soil temperature control section. Vesser soils have albic horizons more than 31 cm (12 inches) thick.

GEOGRAPHIC SETTING: Edgington soils are in depressions and on nearly level parts of loess-covered till plains, driftless areas, and stream terraces. Slope gradients are commonly 0 to 1 percent. Mean annual temperature is 7.2 to 12.2 degrees C (45 to 54 degrees F), and mean annual precipitation is 864 to 1143 mm (34 to 45 inches).

GEOGRAPHICALLY ASSOCIATED SOILS: These are most commonly the somewhat poorly drained Muscatune and Ipava soils, the moderately well drained Osco soils, and the well drained Tama soils. Other associates are the somewhat poorly drained Joy soils and moderately well drained Port Byron soils.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Poorly drained. The potential for surface runoff is negligible or low. Saturated hydraulic conductivity is moderately high or moderately low (0.42 to 4.23 micrometer per second). Permeability is moderately slow or slow. The seasonal high water table is 15 cm (0.5 foot) above the surface to 31 cm (1 foot) below the surface during spring in normal years.

USE AND VEGETATION: Largely under cultivation to corn, soybeans, small grains, and grass-legume meadows. Native vegetation is probably water-loving sedges and grasses.

DISTRIBUTION AND EXTENT: Central to northwestern Illinois in MLRAs 95B, 105, 108A, 108B, and 115C. The extent is small.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana

SERIES ESTABLISHED: Henderson County, Illinois, 1947.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
mollic epipedon - the zone from the surface to a depth of 51 cm (20 inches) (A1 & A2 horizons);
albic horizon - the zone from 51 to 79 cm (20 to 31 inches) (E horizon);
argillic horizon - the zone from 79 to 140 cm (31 to 55 inches) (Btg1, Btg2, Btg3 & Btg4 horizons)

National Cooperative Soil Survey
U.S.A.