LOCATION MINCO OK+KS TXEstablished Series
TAXONOMIC CLASS: Coarse-silty, mixed, superactive, thermic Udic Haplustolls
TYPICAL PEDON: Minco silt loam--cultivated. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 7 inches; brown (7.5YR 4/2) silt loam, dark brown (7.5YR 3/2) moist; weak medium granular structure; slightly hard, very friable; many fine roots; moderately acid; abrupt smooth boundary. (0 to 10 inches thick)
A--7 to 15 inches; brown (7.5YR 4/3) silt loam, dark brown (7.5YR 3/3) moist; moderate medium granular structure; slightly hard, very friable; many fine roots; slightly acid; gradual smooth boundary. (6 to 12 inches thick)
Bw1--15 to 24 inches; reddish brown (5YR 5/4) silt loam; reddish brown (5YR 4/4) moist; moderate medium prismatic structure; slightly hard, friable; common fine roots; slightly alkaline; gradual smooth boundary. (8 to 14 inches thick)
Bw2--24 to 38 inches; light reddish brown (5YR 6/4) silt loam, reddish brown (5YR 5/4) moist; moderate medium prismatic structure; slightly hard, friable; common fine roots; slightly alkaline; gradual smooth boundary. (10 to 20 inches thick)
Bw3--38 to 55 inches; red (2.5YR 5/6) silt loam, red (2.5YR 4/6) moist; weak coarse prismatic structure; slightly hard, friable; few fine roots; moderately alkaline; gradual smooth boundary. (0 to 20 inches thick)
C--55 to 72 inches; red (2.5YR 5/8) silt loam, red (2.5YR 4/8) moist; massive; slightly hard, friable; few fine roots; few films of secondary carbonates; calcareous; moderately alkaline.
TYPE LOCATION: Grady County, Oklahoma; about 1 3/4 miles north of Tuttle; 1,035 feet south and 300 feet east of the northwest corner of sec. 26, T. 10 N., R. 6 W.
RANGE IN CHARACTERISTICS: Solum thickness is 25 to more than 60 inches. Depth to bedrock is more than 72 inches.
The A and Ap horizons have hue of 5YR to 10YR, value of 4 or 5, and chroma of 2 to 3. Texture is loam, silt loam, or very fine sandy loam. Reaction ranges from moderately acid through neutral.
The Bw horizon has hue of 2.5YR to 7.5YR, value of 4 to 6, and chroma of 3 to 6. Texture is loam, silt loam, or very fine sandy loam. Reaction ranges from moderately acid through moderately alkaline.
Some pedons have a BC horizon. Where present, the BC horizon has hue of 2.5YR to 7.5YR, value of 4 to 6, and chroma of 3 to 8. Texture is loam, silt loam, or very fine sandy loam. Reaction ranges from slightly acid to moderately alkaline.
The C horizon has hue of 2.5YR to 7.5YR, value of 4 to 6, and chroma of 4 to 8. Texture is loam, silt loam, or very fine sandy loam. Reaction ranges from slightly acid through moderately alkaline. Some pedons are calcareous in the C horizon below depths of about 36 inches. Some pedons are fine sandy loam at depths below 40 inches.
COMPETING SERIES: These are the Nash series of the same family and the Canadian, Crisfield, Enterprise, Nashville, and Reinach, series of similar families. Canadian and Crisfield soils have more than 15 percent material coarser than very fine sand in the control section. Enterprise and Woodward soils lack a mollic epipedon, and are dryer for longer periods of time. Nash and Nashville soils are 20 to 40 inches deep to bedrock. In addition, Nashville soils have more than 18 percent clay in the control section. Reinach soils have a mollic epipedon more than 20 inches thick.
GEOGRAPHIC SETTING: Minco soils are nearly level through steep soils on terrace uplands. Slopes are mainly 1 to 8 percent, but range from 0 to 30 percent. These soils formed in material weathered from eolian sediments of Pleistocene age. The climate is subhumid.
Mean Annual Precipitation: 26 to 40 inches.
Mean Annual Temperature: 58 to 64 degrees F.
Thornthwaite Annual P-E indices: 44 to 64.
Frost Free Days: 190 to 230.
Elevation ranges from 700 to 1500 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Reinach series and Dougherty, Grant, Konawa, Norge, Pond Creek, and the Teller series. All of these soils except Dougherty, Konowa and Reinach soils are in higher positions and have an argillic horizon with a clay content of more than 18 percent. In addition, Pond Creek soils have a mollic epipedon more than 20 inches thick. Dougherty and Konawa soils are in similar or slightly higher positions and have an argillic horizon but lack a mollic epipedon. Reinach soils are on low terraces of flood plains and have a mollic epipedon more than 20 inches thick.
DRAINAGE AND PERMEABILITY: Well drained; and permeability is moderate; runoff is negligible on 0 to 1 percent slopes, low on 1 to 5 percent slopes, medium on 5 to 20 percent slopes and high on slopes greater than 20 percent.
USE AND VEGETATION: Most areas on slopes of less than 8 percent are used for small grains, grain sorghums, cotton, and alfalfa. Some areas are used for improved pasture or rangeland. Nearly all areas on slopes of more than 8 percent are used for rangeland. Native vegetation is mid and tall grasses.
DISTRIBUTION AND EXTENT: Central Rolling Red Prairies (MLRA 80A) of Oklahoma, Kansas, and Texas. The series is extensive.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Grady County, Oklahoma; 1942.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface of the soil to a depth of 15 inches (A horizons).
Cambic horizon - the zone from 15 inches to a depth of 55 inches (Bw horizons)
ADDITIONAL DATA: Oklahoma State University lab number 68-OK-20-50 and NSSL lab number 580-OK-15-1 in Lincoln, Nebraska.