LOCATION HARTSBURG ILEstablished 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 50 degrees F., and mean annual precipitation is about 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 562 feet. (Colors are for moist soil unless otherwise stated.)
Ap--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--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--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 and 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 10 to 20 inches.)
Bg--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 and manganese oxide concretions with diffuse boundaries lining root channels and pores; common fine prominent yellowish brown (10YR 5/6) masses of iron accumulation in the matrix; neutral; clear smooth boundary.
Bkg--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 and 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 iron accumulation in the matrix; slightly effervescent; slightly alkaline; abrupt wavy boundary. (Combined thickness of the Bg and Bkg horizons is 12 to 35 inches.)
BCkg--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 and 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 iron accumulation in the matrix; violently effervescent among concretions, slightly effervescent in the martix; slightly alkaline; clear wavy boundary. (0 to 16 inches thick)
Cg--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 iron accumulation 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: The depth to the base of the cambic horizon ranges from 24 to 50 inches. The mollic epipedon is 10 to 20 inches in thickness and extends into the AB horizon, the BA horizon, or the upper part of the Bg horizon in some pedons. Depth to carbonates ranges from 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. The particle-size control section averages between 27 and 35 percent clay and less than 5 percent fine sand or coarser.
The Ap, A, or AB horizons have hue of 10YR or are neutral, value of 2 or 3, and chroma of 0 to 2. Reaction ranges from slightly acid to slightly alkaline.
The BA, Bg, Bkg, Btg or BCg horizons have hue of 10YR, 2.5Y, or 5Y; value of 3 to 6; and chroma of 1 or 2. Texture is dominantly silty clay loam, but in some pedons it grades to silt loam in the lower part. Reaction is 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. Krotovina are common throughout the B and C horizons and in places make horizon boundaries obscure.
The Cg or 2Cg horizon has hue of 10YR, 2.5Y, or 5Y; value of 5 or 6; and chroma of 1 or 2. It is silt loam to a depth of more than 40 inches. Some pedons are stratified silt loam and loam below a depth of 40 inches. Sand content below a depth of 40 inches ranges to 30 percent and gravel content ranges from 0 to 7 percent. Reaction is slightly alkaline or moderately alkaline and contains carbonates.
COMPETING SERIES: These are Chalmers, Chetomba, Dolbee, Drummer, Dunham, Elpaso, Elvira, Garwin, Gillett Grove(T), 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 35 inches. Chetomba, Gillett Grove(T), 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 40 inches. Wacousta soils are less than 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 46 to 54 degrees F., mean annual precipitation ranges from 29 to 35 inches, frost free period ranges from 160 to 180 days, and elevation ranges from 540 to 1,020 feet above 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 PERMEABILITY: Poorly drained. Where drained, these soils have an apparent seasonal high water table at a depth of 0.5 foot above the surface to 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 0.5 foot above the surface to 0.5 foot below the surface at some time between November and June in most years. The potential for surface runoff is negligible. 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: Central and north-central Illinois. These soils are moderately extensive (more than 75,000 acres correlated) in MLRA 108.
MLRA OFFICE 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 17 inches (Ap, A1 and A2 horizons); cambic horizon - the zone from 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).