LOCATION ASHPORT OKEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, thermic Fluventic Haplustolls
TYPICAL PEDON: Ashport silty clay loam--cultivated. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 5 inches; dark reddish gray (5YR 4/2) silty clay loam, dark reddish brown (5YR 3/2) moist; weak medium platy structure; hard; firm; many fine roots; slightly acid; abrupt smooth boundary. (0 to 8 inches thick)
A--5 to 16 inches; dark reddish gray (5YR 4/2) silty clay loam, dark reddish brown (5YR 3/2) moist; moderate medium subangular blocky structure; hard, firm; many fine roots; neutral; clear smooth boundary. (0 to 16 inches thick)
Bw--16 to 36 inches; reddish brown (5YR 5/4) silty clay loam, reddish brown (5YR 4/4) moist; weak coarse prismatic structure parting to moderate coarse subangular blocky; hard, firm; few fine roots; slightly acid; clear smooth boundary. (14 to 54 inches thick)
Ab--36 to 52 inches; dark reddish gray (5YR 4/2) loam, dark reddish brown (5YR 3/2) moist; weak coarse prismatic structure parting to weak medium granular; slightly hard, friable; slightly acid; gradual smooth boundary. (0 to 20 inches thick)
Bwb--52 to 66 inches; reddish brown (5YR 5/4) loam, reddish brown (5YR 4/4) moist; weak coarse prismatic structure parting to weak medium subangular blocky; slightly hard, friable; slightly acid; gradual smooth boundary. (0 to 27 inches thick)
BCb--66 to 80 inches; yellowish red (5YR 5/6) loam, yellowish red (5YR 4/6) moist; weak coarse prismatic structure parting to weak coarse subangular blocky; slightly hard, friable; neutral.
TYPE LOCATION: Payne County, Oklahoma; about 1/2 mile west of Stillwater, Oklahoma; 2,440 feet east and 920 feet north of the southwest corner of sec. 16, T. 19 N., R. 2 E.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 26 to more than 60 inches. Depth to a buried horizon ranges from 24 to more than 60 inches. Combined thickness of the A horizons ranges from 10 to 16 inches. The mollic epipedon is less than 20 inches thick. Secondary carbonates occur between 20 and 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, loam, clay loam, or silty clay loam. Reaction ranges from moderately acid to moderately alkaline.
The Bw horizon has hue of 2.5YR to 7.5YR, value of 3 to 5, and chroma of 3 to 6. Texture is silty clay loam, clay loam, loam, or silt loam. Reaction ranges from slightly acid to moderately alkaline. Some pedons have slight effervescence.
Some pedons have C horizons. The C horizon has hue of 2.5YR or 5YR, value of 4 or 5, and chroma of 3 to 6. Texture is loam, silt loam, silty clay loam, or clay loam that is stratified with coarser or finer materials. Reaction is slightly or moderately alkaline. Some pedons have slight effervescence.
The Ab horizon has hue of 5YR or 7.5YR, value of 4 or 5, and chroma of 2 to 4. Texture is loam, silt loam, clay loam or silty clay loam. Reaction ranges from slightly acid to moderately alkaline.
The Bwb horizon has hue of 2.5YR to 7.5YR, value of 4 or 5, and chroma of 3 or 6. Texture is loam, silt loam, or silty clay loam. Reaction is slightly acid to moderately alkaline.
The BCb horizon has hue of 2.5YR to 7.5YR, value of 4 or 5, and chroma of 4 to 6. Texture and reaction are the same as the Bwb horizon.
COMPETING SERIES: These are the Asa, Asher, and Lamkin series in the same family. Asa and Asher soils are calcareous throughout the 10-to 40-inch control section. In addition, Asher soils have coarse-silty textures in the lower part of the control section. Lamkin soils have hue of 10YR in the 10-to-40 inch control section.
GEOGRAPHIC SETTING: Ashport soils are on nearly level, slightly concave, flood plains of small streams in the Central Rolling Red Prairies. Slopes are 0 to 3 percent. They formed in loamy alluvium of Recent age.
Mean Annual Precipitation: 26 to 40 inches.
Mean Annual Temperature: 58 to 65 degrees F.
Thornthwaite Annual P-E indices: 44 to 64.
Frost Free Days: 200 to 230.
Elevation: 700 to 1500 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dale, Port and the Pulaski series. Dale soils occur on slightly higher elevations or higher flood plains that are rarely flooded. Port soils occur on landscapes similar to Ashport soils but are usually further from the stream channel. Dale and Port soils have a mollic epipedon more than 20 inches thick. Pulaski soils occur on similar landscapes as the Ashport soils, but are generally nearer to the channel. Pulaski soils have a coarse-loamy control section and lack a mollic epipedon.
DRAINAGE AND PERMEABILITY: Ashport soils are well drained. Runoff is negligible and permeability is moderate. These soils are occasionally or frequently flooded for very brief to brief periods during March to August.
USE AND VEGETATION: These soils are mainly cultivated. Alfalfa, small grains, and grain sorghum are the principal crops. Some areas are used for improved pasture or rangeland. Native vegetation is tall grass prairie with an overstory of pecan, black walnut, bur oak, and eastern cottonwood trees.
DISTRIBUTION AND EXTENT: Central Rolling Red Prairies of Oklahoma. The series is not extensive.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Payne County, Oklahoma; 1982.
REMARKS: These soils were formerly included in the Port series in older published reports.
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface to a depth of 16 inches (A horizon).
Combic horizon - the zone from 16 inches to 36 inches (B horizon). Moisture Regime: Udic Ustic
ADDITIONAL DATA: Oklahoma State University lab data number 76-OK-60-33.