LOCATION EDINBURG IL+MO

Established Series
Rev. GVB-JCD-AAC
01/2011

EDINBURG SERIES

The Edinburg series consists of very deep, poorly drained soils formed in loess. They are in shallow depressions or broad flat summits on till plains. Mean annual precipitation is about 914 mm (36 inches), and mean annual air temperature is about 12.2 degrees C (54 degrees F).

TAXONOMIC CLASS: Fine, smectitic, mesic Vertic Argiaquolls

TYPICAL PEDON: Edinburg silty clay loam - in a shallow depression in a nearly level cultivated field. (Colors are for moist soil unless otherwise stated.)

Ap--0 to 20 cm (0 to 8 inches); very dark gray (10YR 3/1) silty clay loam, gray (10YR 5/1) dry; moderate fine and medium granular structure; friable; common fine and very fine roots; neutral; abrupt smooth boundary.

A--20 to 25 cm (8 to 10 inches); very dark gray (10YR 3/1) silty clay loam, gray (10YR 5/1) dry; moderate medium granular structure with some moderate very fine subangular blocky; firm; common fine and very fine roots; neutral; clear smooth boundary. [Combined thickness of the A horizon is 25 to 51 (10 to 20 inches).]

BE--25 to 41 cm (10 to 16 inches); very dark gray (10YR 3/1) silty clay loam, gray (10YR 5/1) dry; few fine faint very dark grayish brown (2.5Y 3/2), and few fine distinct olive brown (2.5Y 4/4) and dark grayish brown (2.5Y 4/2) mottles; weak and moderate fine subangular blocky structure; firm; common very fine and few fine roots; few distinct light brownish gray (10YR 6/2) dry, silt coatings on faces of peds; few fine yellowish brown (10YR 5/8) concretions (iron and manganese oxides); neutral; clear smooth boundary. [0 to 20 cm (0 to 8 inches) thick]

Btg1--41 to 51 cm (16 to 20 inches); dark gray (10YR 4/1) silty clay loam; few fine distinct olive brown (2.5Y 4/4) mottles; moderate fine angular blocky structure; firm; many distinct very dark gray (10YR 3/1) clay films on faces of peds; few very fine roots; few fine concretions (iron-manganese oxides); neutral; gradual smooth boundary.

Btg2--51 to 66 cm (20 to 26 inches); dark gray (10YR 4/1) silty clay; few fine distinct olive brown (2.5Y 4/4) mottles; moderate medium prismatic structure parting to moderate medium and coarse angular blocky; firm; common distinct dark gray (10YR 4/1) clay films on faces of peds; few very fine roots; common fine concretions (iron-manganese oxides); slightly acid; gradual smooth boundary.

Btg3--66 to 86 cm (26 to 34 inches); dark gray (10YR 4/1) silty clay loam; common fine distinct yellowish brown (10YR 5/6 and 5/8) mottles; moderate medium prismatic structure parting to moderate coarse angular blocky; firm; common distinct dark gray (10YR 4/1) clay films and few faint very dark gray (10YR 3/1) organic coatings on faces of peds; few very fine roots; few fine concretions (iron-manganese oxides); neutral; gradual smooth boundary.

Btg4--86 to 104 cm (34 to 41 inches); olive gray (5Y 5/2) silty clay loam; many fine and medium prominent yellowish brown (10YR 5/6 and 5/8) mottles; moderate medium prismatic structure parting to moderate coarse angular blocky; firm; few distinct dark gray (10YR 4/1) clay films and very dark gray (10YR 3/1) organic coatings on vertical faces of peds; few very fine roots; few fine concretions (iron-manganese oxides); neutral; gradual smooth boundary. [Combined thickness of the Btg horizon is 41 to 69 cm (16 to 27 inches).]

BCg--104 to 140 cm (41 to 55 inches); olive gray (5Y 5/2) silty clay loam; many fine and medium prominent yellowish brown (10YR 5/6 and 5/8) mottles; weak medium prismatic structure parting to weak coarse angular blocky; friable; few faint dark gray (10YR 4/1) clay films and very dark gray (10YR 3/1) organic coatings on vertical faces of peds; few fine concretions (iron-manganese oxides); neutral; gradual smooth boundary. [20 to 56 cm (8 to 22 inches) thick]

C--140 to 152 cm (55 to 60 inches); mottled yellowish brown (10YR 5/6) and light olive gray (5Y 6/2) silt loam; massive; friable; dark gray (10YR 4/1) linings in channels; neutral.

TYPE LOCATION: Sangamon County, Illinois; about 3 miles southwest of Chatham; 1,200 feet south and 276 feet east of the center of sec. 22, T. 14 N., R. 6 W.

RANGE IN CHARACTERISTICS:
Depth to the base of the argillic horizon: 102 to 165 cm (40 to 65 inches)
Thickness of the mollic epipedon: 25 to 61 cm (10 to 24 inches), includes the upper part of the argillic horizon in some pedons
Average content of sand in the contro section: 1 to 10 percent
special features: These soils are not dry for as many as 30 days during the 120 days following the summer solstice.

Ap or A horizon:
Hue: 10YR
Value: 2 or 3
Chroma: 1 or 2
Texture: silty clay loam or, less commonly, silt loam
Reaction: moderately acid to neutral, although pedons that have been limed range to slightly alkaline.
Other features: Clean silt grains are evident when the soil is dry.

BEg or Eg horizon:
Hue: 10YR
Value: 3 or 4
Chroma: 1 or 2
Texture: silty clay loam or, less commonly, silt loam
Reaction: moderately acid to neutral
Other features: The BE horizon has clean silt grains as coatings on faces of peds. Other pedons have weakly expressed E horizons.

Btg horizon:
Hue: 10YR, 2.5Y or 5Y
Value: 3 to 6
Chroma: 1 or 2 with redox features (mottles) that have chroma of 3 to 8.
Texture: commonly silty clay loam but some pedons are silty clay.
Average content of clay: between 35 and 42 percent clay, but individual subhorizons contain as much as 46 percent clay. Reaction: moderately acid to neutral

BCg or Cg horizon:
Hue: 10YR, 2.5Y or 5Y
Value: 5 or 6
Chroma: 1 or 2 with redox features (mottles) or mixed colors that have chroma of 3 to 8.
Reaction: slightly acid to slightly alkaline

COMPETING SERIES: These are the Butler, Carbika, Chancellor, Clarinda, Coatsburg, Fosterburg, Haig, Lodgepole, Mazaska, Minnetonka, Sacville, Sampsel, Taintor, Terrabella, Virden, Winterset, and Worthing series. Butler and Carbika soils have free carbonates at 46 to 203 cm (18 to 80 inches). Chancellor, and Worthing soils have mollic epipedons thicker than 61 cm (24 inches). Clarinda, Haig, and Minnetonka soils average more than 40 percent clay in the particle size control section. Coatsburg soils average more than 10 percent sand in the control section. Fosterburg soils have concentration of exchangeable sodium in the subsoil. Lodgepole soils are dry in some part of the soil moisture control section for more than 30 days of the 120 days following the summer solstice. Mazaska soils average more than 10 percent sand in the lower one-quarter of the control section. Sacville soils have rock fragments in the subsoil and substratum and formed entirely in alluvium. Sampsel soils have free carbonates at depths of less than 127 cm (50 inches). Sampsel soils also have coarse fragments of shale in the lower one-third of the control section. Taintor soils average more than 32 percent clay in the first one-quarter of the control section. Virden soils do not have an E horizon or noticeable clean silt grains in the control section. Winterset, and Worthing soils average less than 12.2 degrees C (54 degrees F) mean soil temperature in the soil temperature control section.

GEOGRAPHIC SETTING: Edinburg soils are in shallow depressions or on flat summits on loess covered Illinoian till plains. Slope gradients commonly are less than 1 percent, but range from 0 to 2 percent. The soils formed in loess. Upon drying, the Edinburg soils normally appear grayer on the landscape than other surrounding Mollisols. The mean annual temperature varies from 10.0 to 13.9 degrees C (50 to 57 degrees F), and the mean annual precipitation varies from about 864 to 1016 mm (34 to 40 inches).

GEOGRAPHICALLY ASSOCIATED SOILS: These are Denny, Ipava, Sable and Virden soils. Denny soils are in similar shallow depressions on nearby upland plains and are only adjacent to Edinburg soils in a few places. The somewhat poorly drained Ipava soils are on slightly higher positions. Virden and Sable soils are nearly level but adjacent to and slightly higher than Edinburg soils.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Poorly drained. Runoff is slow. Ponding of brief duration occurs from March to June and after major storms. Saturated hydraulic conductivity is moderately low to moderately high (0.42 to 1.41 micrometers per second). Permeability is slow.

USE AND VEGETATION: Most areas of Edinburg soils are cultivated. Corn and soybeans are the principal crops. Native vegetation is wet-prairie grasses.

DISTRIBUTION AND EXTENT: MLRAs 108B, 115B, and 115C in central and southwestern Illinois, and eastern Missouri. The series is of small extent (about 6000 acres correlated).

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

SERIES ESTABLISHED: Christian County, Illinois, 1946.

REMARKS: Classification adjusted to agree with ST Issue # 17 on 23 Aug 94 by CLG. The Clarinda, Coatsburg, and Sampsel soils are competed here even though they are still listed as being in the "sloping" family.

Diagnostic horizons and features recognized in this pedon are: mollic epipedon - the zone from the surface to a depth of approximately 41 cm (16 inches) (Ap, A, and BE horizons); argillic horizon - the zone from approximately 41 to 104 cm (16 to 41 inches) (Btg1, Btg2, Btg3, and Btg4 horizons); aquoll feature - distinct mottles in the lower part of the mollic epipedon.

National Cooperative Soil Survey
U.S.A.