LOCATION HARTSBURG IL
Established Series
Rev. SES-AAC
01/2011
HARTSBURG SERIES
The Hartsburg series consists of very deep, poorly drained, moderately permeable soils on outwash plains, till plains, and glacial lake plains. These soils formed in loess or other silty materials. Slope ranges from 0 to 2 percent. Mean annual temperature is about 10.0 degrees C (50 degrees F), and mean annual precipitation is about 838 mm (33 inches).
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Typic Endoaquolls
TYPICAL PEDON: Hartsburg silty clay loam - on a level area in a cultivated field at an elevation of 171 meters (562 feet) above mean sea level. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 18 cm (0 to 7 inches); black (10YR 2/1) silty clay loam, dark gray (10YR 4/1) dry; moderate medium granular structure; friable; slightly acid; abrupt smooth boundary.
A1--18 to 31 cm (7 to 12 inches); black (10YR 2/1) silty clay loam, dark gray (10YR 4/1) dry; moderate medium granular structure; friable; few very fine roots; slightly acid; clear smooth boundary.
A2--31 to 43 cm (12 to 17 inches); very dark gray (10YR 3/1) silty clay loam, gray (10YR 5/1) dry; moderate medium granular structure; firm; few very fine roots; few fine rounded black (7.5YR 2.5/1) weakly cemented iron-manganese oxide concretions with diffuse boundaries along root channels and pores; few fine distinct dark grayish brown (2.5Y 4/2) iron depletions in the matrix; neutral; clear smooth boundary. [Combined thickness of the A horizon is 25 to 51 cm (10 to 20 inches).]
Bg--43 to 53 cm (17 to 21 inches); dark grayish brown (2.5Y 4/2) silty clay loam; weak fine and medium subangular blocky structure; firm; few very fine roots; common distinct very dark gray (10YR 3/1) organic coatings on faces of peds; common very dark gray (10YR 3/1) krotovina; few fine rounded black (7.5YR 2.5/1) weakly cemented iron-manganese oxide concretions with diffuse boundaries lining root channels and pores; common fine prominent yellowish brown (10YR 5/6) masses of oxidized iron in the matrix; neutral; clear smooth boundary.
Bkg--53 to 76 cm (21 to 30 inches); gray (5Y 5/1) silty clay loam; moderate medium subangular blocky structure; firm; few very fine roots; common distinct dark grayish brown (10YR 4/2) and grayish brown (2.5Y 5/2) pressure faces on faces of peds; common very dark gray (10YR 3/1) krotovina; few fine rounded black (7.5YR 2.5/1) weakly cemented iron-manganese oxide concretions with diffuse boundaries lining root channels and pores; few fine and medium rounded white (10YR 8/1) weakly cemented calcium carbonate concretions throughout; common medium prominent yellowish brown (10YR 5/8) and strong brown (7.5YR 5/8) masses of oxidized iron in the matrix; slightly effervescent; slightly alkaline; abrupt wavy boundary. [Combined thickness of the Bg and Bkg horizons is 31 to 89 cm (12 to 35 inches).]
BCkg--76 to 86 cm (30 to 34 inches); light brownish gray (2.5Y 6/2) silty clay loam; weak coarse subangular blocky structure; firm; many distinct gray (N 5/0) and grayish brown (2.5Y 5/2) linings in pores and root channels; common very dark gray (10YR 3/1) krotovina; few fine rounded black (7.5YR 2.5/1) weakly cemented iron-manganese oxide concretions with diffuse boundaries lining pores; many medium and coarse rounded white (10YR 8/1) weakly cemented calcium carbonate concretions throughout; many medium prominent yellowish brown (10YR 5/8) masses of oxidized iron in the matrix; violently effervescent among concretions, slightly effervescent in the martix; slightly alkaline; clear wavy boundary. [0 to 41 cm (0 to 16 inches) thick]
Cg--86 to 152 cm (34 to 60 inches); light brownish gray (2.5Y 6/2) silt loam; massive; friable; common very dark gray 10YR 3/1) krotovina; few medium rounded white (10YR 8/1) weakly cemented calcium carbonate concretions throughout; many medium prominent strong brown (7.5YR 5/8) masses of oxidized iron with diffuse boundaries lining pores; strongly effervescent; moderately alkaline.
TYPE LOCATION: Logan County, Illinois; about 4 miles southwest of Emden; 660 feet west and 40 feet north of southeast corner of sec. 23, T. 21 N., R. 4 W., USGS New Holland topographic quadrangle; lat. 40 degrees 14 minutes 58 seconds N., and long. 89 degrees 31 minutes 28 seconds W.; NAD 27.
RANGE IN CHARACTERISTICS:
Thickness of the mollic epipedon: 25 to 51 cm (10 to 20 inches), and extends into the AB horizon, the BA horizon, or the upper part of the Bg horizon in some pedons.
Depth to the base of the cambic horizon: 61 to 127 cm (24 to 50 inches)
Particle-size control section: averages between 27 and 35 percent clay and less than 5 percent fine sand or coarser
Depth to carbonates: 38 to 89 cm (15 to 35 inches), pedons that have carbonates at depths at the shallower end of the range are not as deep to the base of the cambic horizon and have clay content at the low end of the range. In places, carbonate concretions are on the soil surface and in the A horizon because of crayfish activity or other mixing.
Ap, A, and/or AB horizons:
Hue: 10YR or N (neutral)
Value: 2 or 3
Chroma: 0 to 2
Reaction: slightly acid to slightly alkaline
BA, Bg, Bkg, Btg and/or BCg horizons:
Hue: 10YR, 2.5Y or 5Y
Value: 3 to 6
Chroma: 1 or 2
Texture; dominantly silty clay loam, but in some pedons it grades to silt loam in the lower part.
Reaction: neutral to moderately alkaline, calcium carbonate concretions are in the lower part in most pedons, and range from few in number to almost continuous masses in horizontal bands or irregular bodies or pockets. In some pedons the only evidence of carbonates is effervescence of the fine earth fraction.
Other features;
Krotovina are common throughout the B and C horizons and in places make horizon boundaries obscure.
Cg or 2Cg horizon:
Hue: 10YR, 2.5Y or 5Y
Value: 5 or 6
Chroma: 1 or 2
Texture: silt loam to a depth of more than 102 cm (40 inches), some pedons are stratified silt loam and loam below a depth of 102 cm (40 inches).
Sand content below a depth of 102 cm (40 inches): ranges to 30 percent
Gravel content: 0 to 7 percent
Reaction: slightly alkaline or moderately alkaline and contains carbonates.
COMPETING SERIES: These are
Chalmers,
Chetomba,
Dolbee,
Drummer,
Dunham,
Elpaso,
Elvira,
Garwin,
Gillett Grove,
Madelia,
Marcus,
Mascoutah,
Maxcreek,
Maxfield,
Maxmore,
Ossian,
Patton,
Pella,
Rushmore,
Sable, and
Wacousta series. Chalmers, Dolbee, Drummer, Elpaso, Elvira, Garwin, Marcus, Mascoutah, Maxfield, Maxmore, Ossian, Patton, and Sable soils do not have carbonates within a depth of 89 cm (35 inches). Chetomba, Gillett Grove, and Madelia soils average more than 5 percent fine sand in the particle-size control section. Dunham soils have more than 7 percent rock fragments in the lower part of the series control section. Marcus soils have more than 35 percent clay in the surface layers. Maxcreek, Pella, and Rushmore soils have horizons with more than 5 percent fine sand within a depth of 102 cm (40 inches). Wacousta soils are less than 61 cm (24 inches) to the base of the cambic horizon.
GEOGRAPHIC SETTING: Hartsburg soils are on broad level areas or in large shallow depressions on Wisconsinan till plains, outwash plains, or glacial lake plains. Slope ranges from 0 to 2 percent. The slopes are plane or slightly concave. Hartsburg soils formed in loess or other silty materials. Mean annual temperature ranges from 7.8 to 12.2 degrees C (46 to 54 degrees F), mean annual precipitation ranges from 737 to 889 mm (29 to 35 inches), frost free period ranges from 160 to 180 days, and elevation ranges from 165 to 311 meters 9540 to 1,020 feet) above mean sea level.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing
Sable soils and the
Ipava,
Muscatune,
Osco, and
Tama soils. Sable soils are on slightly higher positions on the landscape. The somewhat poorly drained Ipava and Muscatune soils, moderately well drained Osco soils and the well drained Tama soils are on higher or more sloping positions on the landscape. They do not have carbonates within a depth of 35 inches.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Poorly drained. Where drained, these soils have an apparent seasonal high water table at a depth of 15 cm (0.5 foot) above the surface to 31 cm (1 foot) below the surface at some time between January and May in most years. In undrained conditions, the apparent seasonal high water table is at a depth of 15 cm (0.5 foot) above the surface to 15 cm (0.5 foot) below the surface at some time between November and June in most years. The potential for surface runoff is negligible. Saturated hydraulic conductivity is moderately high to high (4.23 to 14.11 micrometers per second). Permeability is moderate.
USE AND VEGETATION: Most areas are cultivated. Corn and soybeans are the principal crops. Native vegetation is commonly marsh grasses and sedges.
DISTRIBUTION AND EXTENT: MLRAs 108A and 108B in central and north-central Illinois. These soils are moderately extensive (more than 75,000 acres correlated) .
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana
SERIES ESTABLISHED: Cass County, Illinois, 1939.
REMARKS: Diagnostic horizons and features recognized in this pedon are: mollic epipedon - the zone from the surface to a depth of 43 cm (17 inches) (Ap, A1 and A2 horizons); cambic horizon - the zone from 43 to 76 cm (17 to 30 inches) (Bg, Bkg, and BCkg horizons); endosaturation; aquic conditions - chroma of 2 or less and redoximorphic features in all layers below the Ap horizon.
ADDITIONAL DATA: Data are on file in the Illinois NRCS state office on pedons from Sangamon County, Illinois (Lab. Nos. 20226-20234) and Morgan County, Illinois (79IL-69-15-(1-7).
National Cooperative Soil Survey
U.S.A.