LOCATION REDDICK IL+INEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Endoaquolls
TYPICAL PEDON: Reddick clay loam - on a nearly level area in a cultivated field at an elevation of 200 meters (657 feet) above mean sea level. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 25 cm (0 to 10 inches); black (10YR 2/1) clay loam, dark gray (10YR 4/1) dry; moderate fine and very fine granular structure; friable; slightly alkaline; abrupt smooth boundary.
A--25 to 33 cm (10 to 13 inches); very dark gray (10YR 3/1) clay loam, dark gray (10YR 4/1) dry; moderate fine granular structure; friable; slightly alkaline; clear smooth boundary. [Combined thickness of the A horizon is 25 to 61 cm (10 to 24 inches).]
Bg--33 to 48 cm (13 to 19 inches); dark gray (10YR 4/1) clay loam; weak fine prismatic structure parting to moderate very fine subangular blocky; firm; few fine faint grayish brown (10YR 5/2) iron depletions in the matrix; neutral; clear smooth boundary.
Btg1--48 to 64 cm (19 to 25 inches); gray (5Y 5/1) clay loam; moderate medium prismatic structure parting to moderate fine subangular blocky; firm; common faint dark gray (10YR 4/1) clay films on faces of peds; common medium prominent yellowish brown (10YR 5/4) masses of iron accumulation in the matrix; many medium distinct grayish brown (10YR 5/2) iron depletions in the matrix; slightly alkaline; clear smooth boundary.
Btg2--64 to 81 cm (25 to 32 inches); gray (10YR 5/1) clay loam; moderate medium prismatic structure parting to moderate fine subangular blocky; firm; few faint dark gray (10YR 4/1) clay films on faces of peds; many fine and medium prominent light olive brown (2.5Y 5/4) masses of iron accumulation in the matrix; 2 percent gravel; slightly alkaline; abrupt smooth boundary. [Combined thickness of the Bg and Btg horizons is 30 to 91 cm (12 to 36 inches).]
2Btg3--81 to 119 cm (32 to 47 inches); gray (5Y 6/1) silty clay loam; moderate medium prismatic structure parting to weak medium and coarse subangular blocky; firm; few faint gray (5Y 5/1) clay films on vertical faces of peds; many medium prominent yellowish brown (10YR 5/8) masses of iron accumulation in the matrix; common medium faint light gray (5Y 7/1) iron depletions in the matrix; 3 percent gravel; slightly effervescent; moderately alkaline; gradual wavy boundary. [8 to 41 cm (3 to 16 inches) thick]
2Cg--119 to 152 cm (47 to 60 inches); 70 percent gray (5Y 6/1) and 30 percent light gray (5Y 7/1) silty clay loam; massive; firm; many medium prominent yellowish brown (10YR 5/6 and 10YR 5/8) masses of iron accumulation in the matrix; 4 percent gravel; strongly effervescent; moderately alkaline.
TYPE LOCATION: Kankakee County, Illinois; about 1.6 kilometers (1 mile) southwest of Buckingham; 797 meters (2,616 feet) south and 8 meters (27 feet ) east of the northwest corner of sec. 34, T. 30 N., R. 9 E.; USGS Buckingham topographic quadrangle; lat 41 degrees 01 minutes 57 seconds N. and long. 88 degrees 11 minutes 25 seconds W., NAD 27; UTM Zone 16, 399930 easting and 4543058 northing, NAD 83.
RANGE IN CHARACTERISTICS: The depth to the base of soil development ranges from 89 to 140 cm (35 to 55 inches) thick. The depth to carbonates is 61 to 135 cm (24 to 53 inches). The loamy water-laid sediments are about 76 to 127 cm (30 to 50 inches) thick. The mollic epipedon ranges from 25 to 61 cm (10 to 24 inches) in thickness. The particle-size control section averages between 18 and 35 percent clay and more than 15 percent sand coarser than very fine. There is less than 25 percent difference in clay contents between the water-laid sediments and the till or lacustrine sediment within 102 cm (40 inches) of the surface.
The Ap or A horizon has hue of 10YR or is neutral, value of 2 to 3, and chroma of 0 to 2. It is loam, clay loam, or silty clay loam. Reaction is slightly acid to slightly alkaline.
The Bg or Btg horizon has hue of 10YR, 2.5Y, or 5Y, value of 4 to 6, and chroma of 1 or 2. Redoximorphic features commonly have higher chroma. Texture is clay loam, loam, or silty clay loam with a high sand content. Gravel content is less than 5 percent gravel. Thin horizons of loamy sand or textures with up to 50 percent gravel are not excluded. Reaction is slightly acid to slightly alkaline.
The 2Bg or 2Btg horizon has hue of 10YR, 2.5Y, or 5Y, value of 4 to 6, and chroma of 1 or 2. Redoximorphic features commonly have higher chroma. Texture is commonly silty clay loam and ranges to silty clay or clay. Gravel content is less than 10 percent Reaction is neutral to moderately alkaline.
The 2Cg horizon has hue of 10YR, 2.5Y, or 5Y, value of 4 to 6, and chroma of 1 to 6. It is typically silty clay loam but the range also includes silty clay or clay. Some pedons have thin strata of coarser and finer textures. Gravel content is less than 15 percent. Reaction is slightly alkaline or moderately alkaline.
COMPETING SERIES: These are the Clyde, Faxon, Kossuth, Letri, Marengo, Mound Creek, Selma, Selmass, Tripoli, Webster, and Wolcott series. Clyde, Kossuth, Letri, Marengo, Selma, Selmass, Tripoli, Webster, and Wolcott soils contain more than 20 percent sand in the lower part of the series control section. Faxon and Mound Creek soils have a lithic contact within a depth of 102 cm (40 inches).
GEOGRAPHIC SETTING: Reddick soils formed in 76 to 127 cm (30 to 50 inches) of loamy water-laid sediments over till or lacustrine sediments. These soils are on nearly level to slightly undulating topography. Slope gradient is usually less than 1 percent but ranges from 0 to 2 percent. Mean annual temperature ranges from 7 to 11 degrees C (45 to 53 degrees F), mean annual precipitation ranges from 711 to 1016 mm (28 to 40 inches), frost-free period ranges from 140 to 180 days, and elevation ranges from 156 to 285 meters (512 to 935 feet) above sea level.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Andres, Elliott, Mokena, and Symerton soils. The somewhat poorly drained Andres soils and moderately well drained Symerton soils form a hydro-sequence with the Reddick soils and are on higher landform positions. Elliott and Mokena soils are somewhat poorly drained and are on slightly higher landform positions.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Poorly drained. Where drained, an intermittent apparent seasonal high water table is 15 cm (0.5 foot) above the surface to 30 cm (1.0 foot) below the surface at some time between January and May in normal years. The potential for surface runoff is negligible. Saturated hydraulic conductivity is moderately high or high (4.23 to 14.11 micrometers/s) in the loamy material and moderately low or moderately high (0.14 to 1.41 micrometers/s) in the till or lacustrine sediments. Permeability is moderate in the loamy material and slow or very slow in the till or lacustrine sediments.
USE AND VEGETATION: Most areas are drained and are cultivated. Corn, soybeans, small grains, and meadow are the principal crops. Native vegetation is swamp grasses.
DISTRIBUTION AND EXTENT: Northern and eastern Illinois and northwestern Indiana. The series is of moderate extent in MLRAs 98, 110, and 111C with about 23,141 hectares (50,910 acres) mapped.
MLRA OFFICE RESPONSIBLE: Indianapolis, Indiana.
SERIES ESTABLISHED: Kankakee County, Illinois, 1975.
REMARKS: Diagnostic horizons and features recognized in this pedon are: mollic epipedon - the zone from the surface to a depth of 33 cm (13 inches) (Ap and A horizons); cambic horizon -the zone from 33 to 119 cm (13 to 47 inches) (Bg, Btg1, Btg2, and 2Btg3 horizons); aquic moisture regime - chroma of 1 in the matrix and redoximorphic features present in the zone from 33 to 152 cm (13 to 60 inches) (Bg, Btg1, Btg2, 2Btg3, and 2Cg horizons).