LOCATION HOOP WIEstablished Series
TAXONOMIC CLASS: Coarse-loamy, siliceous, active, mesic Aquic Argiudolls
TYPICAL PEDON: Hoop sandy loam - on a plane north-facing 1 percent slope in a cultivated field at an elevation of about 875 feet. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 7 inches; very dark grayish brown (10YR 3/2) sandy loam, dark brown (10YR 5/3) dry; moderate medium subangular structure parting to weak medium granular; friable; common very fine and fine roots; slightly acid; abrupt smooth boundary. (7 to 10 inches thick)
A--7 to 11 inches; very dark grayish brown (10YR 3/2) sandy loam, brown (10YR 5/3) dry; moderate coarse subangular blocky structure; friable; common very fine and fine roots; slightly acid; abrupt wavy boundary. (0 to 10 inches thick)
Bt1--11 to 17 inches; dark yellowish brown (10YR 4/4) sandy loam; moderate coarse subangular blocky structure; friable; common very fine and fine roots; few faint brown (10YR 4/3) clay films on faces of peds; few medium distinct grayish brown (10YR 5/2) masses of iron depletion; moderately acid; clear irregular boundary.
Bt2--17 to 24 inches; grayish brown (10YR 5/2) sandy loam; weak coarse subangular blocky structure; friable; common very fine and fine roots; few faint brown (10YR 4/3) clay films on faces of peds; many coarse distinct yellowish brown (10YR 5/6) and prominent red (2.5YR 4/6) masses of iron accumulation; strongly acid; abrupt irregular boundary. (Combined thickness of the Bt horizon ranges from 10 to 24 inches)
2BC--24 to 34 inches; brownish yellow (10YR 6/6) sand; single grain; loose; few very fine and fine roots; common coarse prominent strong brown (7.5YR 5/8) masses of iron accumulation; moderately acid; clear wavy boundary. (0 to 12 inches thick)
2C--34 to 60 inches; light brownish gray (10YR 6/2) sand; single grain; loose; common coarse yellow (10YR 7/6) masses of iron accumulation; moderately acid.
TYPE LOCATION: Jackson County, Wisconsin; about 3 miles north and 0.5 miles east of Black River Falls; 500 feet south and 300 feet east of the northwest corner of sec. 36, T. 22 N., R. 4 W.
RANGE IN CHARACTERISTICS: Thickness of the loamy mantle and depth to siliceous sandy alluvium range from 20 to 40 inches. Thickness of the mollic epipedon ranges from 7 to 24 inches. The particle size control section averages from 10 to 17 percent clay and from 45 to 75 percent sand. The particle size control section and the sandy alluvium contain less than 10 percent weatherable minerals in the 0.02 to 2 mm fraction. Coarse fragments typically are absent, but the volume of sandstone gravel or channers ranges from 0 to 15 percent throughout. Reaction typically ranges from very strongly acid to slightly acid in the loamy mantle, but ranges to neutral in the upper part, where the soil is limed. Reaction ranges from strongly acid to slightly acid in the sandy alluvium. Free carbonates are absent to a depth of more than 80 inches. Either redox features and aquic conditions occur within 16 inches of the surface or aquic conditions occur directly below the mollic epipedon with redox depletions with chroma of 2 or less as the matrix or as masses in the matrix.
The Ap or A horizons have hue of 7.5YR or 10YR, value of 2 or 3, and chroma of 1 to 3.
The Bt horizon has hue of 7.5YR, 10YR, or 2.5Y; value of 4 to 6; and chroma of 2 to 4. Typically, it is sandy loam or fine sandy loam but some pedons have subhorizons of loam.
Some pedons have a thin 2Bt horizon with hue of 7.5YR, 10YR, or 2.5Y; value of 4 to 6; and chroma of 1 to 8. It is sand or loamy sand.
The 2BC horizon has color and texture like the 2Bt horizon described above. In some pedons, it is the color of the uncoated sand grains.
The 2C horizon has hue of 7.5YR or 10YR; value of 4 to 8, and chroma of 2 to 6. In many pedons, the color is that of the uncoated sand grains.
COMPETING SERIES: There are no competing series. Related soils are the Bilmod, Bilson, and Sooner soils. Bilmod and Bilson soils are Mollic Hapludalfs. Sooner soils are Aquollic Hapludalfs, are fine-loamy, and have mixed mineralogy.
GEOGRAPHIC SETTING: Hoop soils are on stream terraces and pediments. Slope gradients range from 0 to 3 percent. These soils formed in siliceous loamy alluvium underlain by siliceous sandy alluvium. Mean annual precipitation ranges from 28 to 33 inches. Mean annual temperature ranges from 46 to 51 degrees F. The frost free period ranges from about 135 to 160 days. Elevation ranges from 700 to 1100 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bilmod, Bilson, Merimod, Merit, and Sooner series. The moderately well drained Bilmod soils and the well drained Bilson soils form a drainage sequence with Hoop soils. The well drained Merit soils, the moderately well drained Merimod soils, and the somewhat poorly drained Sooner soils form a drainage sequence in nearby areas where there is more silt and clay and less sand in the soil.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained. Runoff is slow. Permeability is moderate or moderately rapid in the loamy mantle and rapid in the sandy alluvium. Hoop soils have an apparent seasonal high water table at a depth of 1 to 2 feet for 1 month or more per year at some time during the period November to May in 6 or more out of 10 years.
USE AND VEGETATION: Most areas are used for cropland. Common crops are corn, small grain, and hay. Some areas are used for pastureland. Native vegetation is prairie grass.
DISTRIBUTION AND EXTENT: West central Wisconsin. The extent is small.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Jackson County, Wisconsin, 1994.
REMARKS: This soil may not be a Mollisol because it may have base saturation of less than 50 percent (by NH4OAc) in some horizon between the top of the argillic horizon and a depth of 125 cm below the top of the argillic. It would then classify as Aquultic Hapludalfs. No laboratory data are available.
Diagnostic horizons and features recognized in this pedon are: mollic epipedon - 0 to 11 inches (Ap, A); argillic horizon - 11 to 24 inches (Bt1, Bt2); aquic feature - redox depletions with chroma of 2 or less and aquic conditions within 16 inches of the soil surface; siliceous feature - less than 10 percent weatherable minerals in the particle-size control section (0.02 to 2 mm fraction)
ADDITIONAL DATA: Soil Interpretation Record - WI0555.