LOCATION GRANT OK+KSEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, thermic Udic Argiustolls
TYPICAL PEDON: Grant silt loam--cultivated. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 7 inches; brown (7.5YR 5/2) silt loam, dark brown (7.5YR 3/2) moist; weak fine granular structure; slightly hard, very friable; many fine roots; slightly acid; clear smooth boundary. (0 to 10 inches thick)
A--7 to 12 inches; brown (7.5YR 4/2) silt loam, dark brown (7.5YR 3/2) moist; moderate fine granular structure; slightly hard, very friable; many fine roots; slightly acid; gradual smooth boundary. (4 to 15 inches thick)
AB--12 to 16 inches; reddish brown (5YR 4/3) silt loam, dark reddish brown (5YR 3/3) moist; moderate medium granular structure; slightly hard, friable; many fine roots; neutral; gradual smooth boundary. (0 to 13 inches thick)
Bt--16 to 32 inches; reddish brown (5YR 5/4) silty clay loam, reddish brown (5YR 4/4) moist; moderate medium subangular blocky structure; hard, friable; common fine roots; clay films on faces of peds; neutral; gradual smooth boundary. (15 to 30 inches thick)
BC--32 to 47 inches; yellowish red (5YR 5/6) silt loam, yellowish red (5YR 4/6) moist; weak medium subangular blocky structure; hard, friable; few fine roots; slightly alkaline; gradual smooth boundary. (10 to 30 inches thick)
C--47 to 59 inches; yellowish red (5YR 5/6) silt loam, yellowish red (5YR 4/6) moist; massive; hard, friable; few fine roots; common medium fragments of sandstone; calcareous; moderately alkaline; clear smooth boundary. (0 to 30 inches thick)
Cr--59 to 72 inches; red (2.5YR 5/6) weakly consolidated sandstone, red (2.5YR 4/6) moist; moderately alkaline; calcareous in seams.
TYPE LOCATION: Garfield County, Oklahoma; about 2 miles north and 6 1/2 miles west of Hillsdale; 500 feet south and 100 feet east of the northwest corner of sec. 6, T. 24 N., R. 8 W.
RANGE IN CHARACTERISTICS: Thickness of solum and depth to bedrock range from 40 to 60 inches. Depth to secondary carbonates range from 30 to 60 inches.
The A horizon has hue of 5YR to 10YR, value of 4 or 5, and chroma of 2 or 3. Texture is silt loam, very fine sandy loam, or loam. Reaction ranges from slightly acid to slightly alkaline.
The AB horizon has hue of 2.5YR to 7.5YR, value of 4 or 5, and chroma of 2 to 4. Texture is silt loam, very fine sandy loam, or loam. Reaction ranges from slightly acid to slightly alkaline.
The Bt horizon has hue of 2.5YR to 7.5YR, value of 4 or 5, and chroma of 2 to 8. Texture is silt loam, loam, very fine sandy loam, silty clay loam, or clay loam. Clay content is typically 22 to 28 percent but ranges from 18 to 35 percent. Reaction ranges from slightly acid to moderately alkaline.
The BC horizon has hue of 2.5YR or 5YR, value of 4 or 6, and chroma of 4 to 8. Texture is silt loam or loam, but includes very fine sandy loam, silty clay loam, or clay loam. Reaction ranges from neutral to moderately alkaline. Some pedons are calcareous in the lower part.
The C horizon has hue of 2.5YR or 5YR, value of 4 to 7, and chroma of 4 to 8. Texture is silt loam, loam, or very fine sandy loam. Fragments of sandstone 5 mm to 1 inch in diameter make up 0 to 20 percent by volume. This horizon is noncalcareous in some pedons. Reaction ranges from slightly alkaline to moderately alkaline.
The Cr layer is soft reddish bedrock of silty sandstone or silty shale. It is calcareous in some pedons. This material is mainly non paralithic. Fractures are greater than 10 cm apart. The material is dense enough to be root restrictive. This material has low to moderate excavation difficulty and slakes in water in less than 15 hours.
COMPETING SERIES: These are the Kingfisher (OK) and Vanoss (OK) series in the same family. Soils in similar families are the Chickasha, Corbin, Lovedale, Naron, Nashville, Norge, Pond Creek, Teller, and Zaneis series. Chickasha, Naron, Lovedale, Teller, and Zaneis soils have a fine-loamy control section. Corbin and Pond Creek soils have a mollic epipedon more than 20 inches thick. Kingfisher soils have bedrock within 40 inches. Nashville soils lack an argillic horizon. Norge soils have a argillic horizon that does not decrease in clay by as much as 20 percent from the maximum. Vanoss soils have hues of 7.5YR or 10YR in the argillic horizon.
GEOGRAPHIC SETTING: Grant soils are on nearly level through moderately steep uplands. Slopes are 0 to 20 percent. They formed in material weathered from silty sandstone or silty shale. In some areas these soils have a thin loess mantle. The climate is dry or moist subhumid. Average Annual Precipitation: 26 to 38 inches. Mean Annual Temperature is 57 to 63 degrees F. Thornthwaite Annual P-E indices of 44 to 64. Frost free days range from 190 to 220. Elevation ranges from 700 to 1500 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bethany, Lucien, Nash, Nashville, Norge, and Pond Creek series. Bethany soils have a fine texture control class and are on broad flats. Lucien, Nash and Nashville soils do not have a argillic horizons, and have bedrock within 40 inches of the soil surface and they occur on sideslopes. Norge and Pond Creek soils are in lower positions with the Norge soils on sideslopes and the Pond Creek soils on broad flats.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability; runoff is negligible on 0 to 1 percent slopes, low on 1 to 5 percent slopes and medium on 5 to 20 percent slopes.
USE AND VEGETATION: Most areas are cropped to wheat and other small grains; lesser amounts are cropped to sorghums, cotton, and alfalfa. Native vegetation consists of tall and mid grasses.
DISTRIBUTION AND EXTENT: Central Rolling Red Prairies (MLRA-80A) of Oklahoma and south-central Kansas. The series is extensive.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Grant County, Oklahoma; 1931.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface of the soil to a depth of 16 inches (A and AB horizons).
Argillic horizon - the zone from 16 inches to a depth of 32 inches (Bt horizon).
Cr horizon - soft geologic material at 59 inches that is root restrictive but is not paralithic.
ADDITIONAL DATA: Soil Survey Investigations Report No. 11, May 1967. Lab Nos. 5480-5487.
Soil Interpretation Record Number: Series OK0047
Severely Eroded OK0269