LOCATION IDABEL OKEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, thermic Fluventic Eutrudepts
TYPICAL PEDON: Idabel silt loam - cultivated.
(Colors are for moist soil unless otherwise stated.)
Ap--0 to 6 inches; -- dark reddish brown (5YR 3/3) silt loam; weak fine granular structure; very friable; few worm casts; calcareous in part of the mass; moderately alkaline; abrupt smooth boundary. (4 to 8 inches thick)
Bw--6 to 20 inches; -- reddish brown (5YR 4/3) silt loam; weak medium and fine subangular blocky structure; friable; many fine pores; many worm casts; calcareous in part of the mass; moderately alkaline; clear smooth boundary. (8 to 27 inches thick)
2C1--20 to 35 inches; -- reddish brown (5YR 4/4) very fine sandy loam; structureless; very friable; few worm casts; common thin strata of loam and fine sandy loam; calcareous in part of the mass in the upper part and calcareous below; moderately alkaline; clear smooth boundary. (7 to 30 inches thick)
2C2--35 to 52 inches; -- yellowish red (5YR 5/6) very fine sandy loam; structureless; very friable; common thin strata of loam and fine sandy loam; calcareous; moderately alkaline; gradual smooth boundary. (0 to 25 inches thick)
2C3--52 to 60 inches; -- reddish brown (5YR 5/4) silt loam; structureless; friable; common thin strata of reddish yellow (5YR 7/6) and yellowish red (5YR 5/6) very fine sandy loam and fine sandy loam; calcareous; moderately alkaline.
TYPE LOCATION: McCurtain County, Oklahoma, about 18 miles southeast of Idabel; 600 feet west and 400 feet south of the northeast corner, sec. 17, T. 10 S., R. 26 E.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 20 to 40 inches. The A horizon has hue of 5YR, value of 3 or 4, and chroma of 3 or 4. Texture is loam, very fine sandy loam, or silt loam. Reaction is neutral or mildly alkaline.
The Bw horizon has hue of 5YR, value of 4 to 7, and chroma of 3 to 8. Texture is silt loam, loam, fine sandy loam or very fine sandy loam. Reaction ranges from neutral to moderately alkaline.
The 2C horizons have the same colors and textures as the Bw horizon. Thin strata of finer or coarser materials occur in the 2C horizons. Reaction is mildly alkaline or moderately alkaline.
COMPETING SERIES: There are no series in the same family. Soils in similar families are the Coushatta, Dela, Madill, Ochlockonee, Oklared, Robinsonville, Severn, Thenas, and Toccoa series. Coushatta soils have fine-silty control sections. Dela, Madill, Ochlockonee, Oklared, Robinsonville, Severn, and Toccoa soils do not have cambic horizons. In addition, Dela and Ochlockonee soils have siliceous mineralogy. Thenas soils have mottles of chroma 2 or less within a depth of 24 inches.
GEOGRAPHIC SETTING: Idabel soils occur on nearly level floodplains, mainly on rivers in the Western Coastal Plains that carry sediments from Permian Red Beds. They formed in loamy, calcareous alluvium of Recent age. Flooding is rare or occasional for very brief periods. The climate is humid. Average annual precipitation ranges from 40 to 50 inches. Mean annual temperature ranges from 59 degrees to 65 degrees F. Thornthwaite annual P-E index ranges from 64 to 80.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Coushatta, Oklared, and Severn soils and the Redlake soils on similar landscapes. Redlake soils have a fine control section.
DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderately rapid. Runoff is slow.
USE AND VEGETATION: Most areas are cultivated to wheat, cotton, soybeans, peanuts, alfalfa, and grain sorghum. Improved Bermudagrass pastures are common. Native forest vegetation is pecan, Eastern cottonwood, American elm, red oak, sweetgum, and hackberry.
DISTRIBUTION AND EXTENT: Western Coastal Plains of Oklahoma, Arkansas, Louisiana, and Texas. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: McCurtain County, Oklahoma; 1970.
REMARKS:
Diagnostic horizons and features in this pedon are:
Ochric epipedon - zone from the surface to about 6 inches. (Ap horizon)
Cambic horizon - zone from 6 to 20 inches. (Bw horizon)
Fluventic Eutrochrepts features - Soils in the udic moisture regime that have a cambic horizon with a base saturation of 60 percent or more and have irregular decrease in organic matter content in the 20 to 52 inch zone. (2C1, 2C2 horizons)