LOCATION PULASKI OK+AR TXEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, nonacid, thermic Udic Ustifluvents
TYPICAL PEDON: Pulaski fine sandy loam--cultivated. (Colors are for dry soils unless otherwise stated.)
Ap--0 to 7 inches; reddish brown (5YR 5/4) fine sandy loam, reddish brown (5YR 4/4) moist; weak fine and very fine granular structure; soft, very friable; moderately acid; clear smooth boundary. (0 to 12 inches thick)
A--7 to 19 inches; reddish brown (5YR 5/4) fine sandy loam, reddish brown (5YR 4/4) moist; weak fine and very fine granular structure; slightly hard, very friable; moderately acid; gradual smooth boundary. (4 to 20 inches thick)
C1--19 to 40 inches; yellowish red (5YR 5/6) fine sandy loam, yellowish red (5YR 4/6) moist; massive; slightly hard, very friable; few thin strata of darker colored fine sandy loam in lower part; slightly acid; gradual smooth boundary. (16 to 41 inches thick)
C2--40 to 64 inches; reddish yellow (5YR 6/6) fine sandy loam, yellowish red (5YR 5/6) moist; massive, slightly hard, very friable; common thin strata of loamy fine sand; slightly acid.
TYPE LOCATION: Lincoln County, Oklahoma; about 6 miles north and 1 mile east of Chandler; 1,135 feet north and 200 feet east of the southwest corner of sec. 2, T. 15 N., R. 4 E.
RANGE IN CHARACTERISTICS: Some pedons have buried horizons below a depth of 30 inches. The 10- to 40-inch control section is noneffervescent.
The A horizon has hue of 2.5YR to 10YR, value of 4 to 7, and chroma of 2 to 6. Where the A horizon has moist value and chroma less than 3.5 and is more than 10 inches thick, the organic matter content is less than 1 percent. Texture is fine sandy loam, loam, or loamy fine sand. Where the texture is loamy fine sand, the thickness is less than 10 inches. Reaction is moderately acid to slightly alkaline.
The C horizon has hue of 2.5YR to 7.5YR, value of 4 to 7, and chroma of 3 to 8. Texture is fine sandy loam, very fine sandy loam, or loam. Some pedons have a texture of loamy fine sand below a depth of 40 inches. Strata of coarser or finer materials occur throughout the C horizon. The strata range from 2 mm to 25 mm thick and from 1 cm to 15 cm apart. Reaction ranges from moderately acid to slightly alkaline to a depth of 40 inches, and below a depth of 40 inches the reaction ranges from moderately acid to moderately alkaline.
COMPETING SERIES: There are no known series in the same family.
GEOGRAPHIC SETTING: Pulaski soils are on nearly level to very gently sloping flood plains of small tributaries in the Cross Timbers. Slopes are 0 to 3 percent. They formed in loamy alluvial sediments of Recent age. Mean Annual Precipitation: 30 to 40 inches. Mean Annual Temperature: 58 to 63 degrees F. Thornthwaite Annual P-E indices: 44 to 64. Frost free days: 200 to 230. Elevation: 700 to 1300 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Gaddy, Tribbey, Yahola, Ashport, Cyril, Easpur, Gracemont, Gracemore, and Port series. Cyril, Tribbey, and Yahola soils occur on similar areas of the landscape. In addition, Cyril soils have a mollic epipedon. Gaddy, Gracemont, and Gracemore soils usually occur on flood plains nearer the stream channel of the larger streams. In addition, Gracemont and Gracemore soils have an apparent water table within 20 to 40 inches of the soils surface and are calcareous throughout and Gracemore soils have a sandy control section. Ashport, Easpur, and Port soils occur at slightly higher elevations. Ashport and Port soils have a mollic epipedon and a fine-silty textural control section. Easpur soils have a mollic epipedon and a fine-loamy textural control section.
DRAINAGE AND PERMEABILITY: Well drained; negligible runoff; moderately rapid permeability. These soils are occasionally or frequently flooded for very brief periods of time during the months of March to October.
USE AND VEGETATION: Mainly cultivated to alfalfa, small grains, grain sorghums, cotton, and tame pasture. Native vegetation is tall and midgrasses with an overstory of pecan, black walnut, American elm, eastern cottonwood, and tamarisk.
DISTRIBUTION AND EXTENT: Northern Cross Timbers (MLRA 84A) of Oklahoma, Kansas, and Texas. The series is extensive.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Lonoke County, Arkansas; 1921.
REMARKS: Soil Interpretation Record No. OK0035
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from the surface of the soil to a depth of 19 inches (A horizons).
Irregular decrease in organic carbon.
Udic-Ustic Moisture Regime.