LOCATION DEVOL OK TXEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, thermic Typic Haplustalfs
TYPICAL PEDON: Devol loamy fine sand--cultivated. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 14 inches; light brown (7.5YR 6/4) loamy fine sand, brown (7.5YR 4/4) moist; single grained; soft, very friable; neutral; the upper 8 inches is a plowed layer that does not differ appreciably from the rest of the horizon; neutral; gradual smooth boundary. (12 to 18 inches thick)
Bt--14 to 27 inches; reddish brown (5YR 5/4) fine sandy loam, reddish brown (5YR 4/4) moist; weak medium prismatic structure; slightly hard, very friable; clay bridges between sand grains and a few discontinuous clay films on prism faces; slightly alkaline; gradual smooth boundary. (8 to 24 inches thick)
BC--27 to 40 inches; yellowish red (5YR 5/6) fine sandy loam, yellowish red (5YR 4/6) moist; weak coarse prismatic structure; slightly hard, very friable; slightly alkaline; gradual smooth boundary. (8 to 24 inches thick)
C--40 to 64 inches; brown (7.5YR 5/4) loamy fine sand, brown (7.5YR 4/4) moist; massive; slightly hard, very friable; noneffervescent; moderately alkaline.
TYPE LOCATION: Tillman County, Oklahoma; about 3 miles north and 1 mile east of Tipton; 300 feet south and 150 feet east of the northwest corner of the northeast 1/4 sec. 20, T. 1 N., R. 18 W.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 30 to 60 inches. Depth to carbonates is greater than 30 inches.
The A horizon has hue of 5YR to 10YR, value of 4 to 6, and chroma of 2 to 6. Texture is loamy sand, loamy fine sand or fine sandy loam with less than 2 percent gravel, and reaction ranges from moderately acid to slightly alkaline.
The Bt horizon has hue of 2.5YR to 10YR, value of 4 to 6, and chroma of 4 to 6. Texture is sandy loam, fine sandy loam or loamy fine sand but the textural control section clay content average ranges from 8 to 18 percent with less than 2 percent gravel. Reaction ranges from slightly acid to moderately alkaline.
The BC horizon has hue of 2.5YR to 10YR, value of 4 to 7, and chroma of 4 to 6. Texture is fine sandy loam, loamy fine sand or loamy sand with less than 2 percent gravel, and reaction ranges from neutral to moderately alkaline.
The C horizon has hue of 2.5YR to 10YR, value of 4 to 7, and chroma of 4 to 8. Texture is fine sandy loam, sandy loam, loamy fine sand, loamy sand, or fine sand with less than 2 percent gravel. Reaction ranges from neutral to moderately alkaline.
COMPETING SERIES: This is the Fortyone (OK) series in the same family. Soils in similar families include the Cobb (TX), Eda (OK), Grandfield (OK), May (TX), Miles (TX), Nobscot (OK), and Springer (TX) series. Fortyone soils contain between 2 and 15 percent rounded gravel throughout the solum. Cobb, Grandfield, May, and Miles soils have fine-loamy particle-size control sections. Nobscot soils have sandy surface layers more than 20 inches thick. Eda soils have a loamy fine sand argillic horizon. Springer soils have a bisequal solum and are more clayey in the lower part.
GEOGRAPHIC SETTING: Devol soils are on nearly level to moderately steep dunes and wind reworked sandsheets on terraces of the Central Rolling Red Plains (MLRA-78B, 78C). Slopes range from 0 to 20 percent. The soil formed in loamy and sandy sediments of Pleistocene age. Mean annual precipitation ranges from 20 to 30 inches. Mean annual air temperature ranges from 57 to 64 degrees F. Frost Free Days range from 185 to 230. Thornthwaite annual P-E indices range from 32 to 44. Elevation ranges from 1000 to 2200 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Carman, Carwile, Springer, Eda, Grandfield, Grandmore, Lovedale, Meno, Miles, Nobscot, Ruella, Tipton, Tivoli and Waynoka series. Carman, Grandfield, Grandmore, Lovedale, Ruella and Tipton soils have fine-loamy control sections, in addition Carman, Lovedale and Tipton soils have mollic surfaces. Carwile soils have fine control sections. Springer series: These soils occur on similar positions and have a bisequal solum and are more clayey in the lower part. Eda soils have a loamy fine sand argillic horizon and are on slightly more undulating topography. Meno soils have redoximorphic features in the soil profile. Miles soils have fine-loamy control sections and do not decrease in clay content within 60 inches. Nobscot soils have sandy surface layers greater than 20 inches thick and are on slightly higher convex ridges and side slopes. Tivoli soils lack an argillic horizon and are on dune or hummocky areas. Waynoka soils have a lithologic discontinuity within the soil profile.
DRAINAGE AND PERMEABILITY: Well drained; moderately rapid permeability. Runoff is negligible on 0 to 1 percent slopes, very low on slopes of 1 to 5 percent, and low on 5 to 20 percent slopes,
USE AND VEGETATION: The undulating slopes are used mainly for growing wheat, sorghums and cotton. The hummocky slopes are used for native range. The native vegetation includes tall grasses such as sand bluestem, indiangrass, little bluestem and shrubs such as sand sagebrush.
DISTRIBUTION AND EXTENT: Central Rolling Red Plains (MLRA-78B, 78C) of Oklahoma and Texas. The series is moderately extensive.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Stonewall County, Texas; 1970.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric Epipedon- the zone from the surface to 14 inches (A horizon).
Argillic horizon- The zone from 14 to 27 inches (Bt horizon).
Moisture regime- Typic Ustic.
Soil Interpretation Record: OK0061 Series OK0358 Silty Substratum