LOCATION EDA OKEstablished Series
TAXONOMIC CLASS: Mixed, thermic Lamellic Ustipsamments
TYPICAL PEDON: Eda loamy fine sand - in rangeland. (Colors are for dry soil unless otherwise stated.)
A--0 to 16 inches; brown (7.5YR 5/4) crushed loamy fine sand, brown (7.5YR 4/4) crushed moist; weak medium subangular blocky structure parting to structureless, single grained; loose, very friable, non sticky, non plastic; many fine roots throughout; slightly acid (pH 6.5); clear wavy boundary. (7 to 20 inches thick)
E/Bt1--16 to 29 inches; reddish yellow (5YR 6/6) crushed sand, yellowish red (5YR 5/6) crushed moist; weak coarse prismatic structure parting to weak medium subangular blocky; slightly hard, very friable, non sticky, non plastic; common fine roots and few medium roots throughout; few fine discontinuous tubular pores; lamellae 2 to 10 mm thick, 2 to 12 cm apart; color of lamellae is red (2.5YR 4/6); lamellae texture is loamy fine sand with 2 to 3 percent more clay than the matrix; few distinct continuous clay films bridging between sand grains; neutral (pH 6.8); gradual wavy boundary. (15 to 30 inches thick)
E/Bt2--29 to 43 inches; reddish yellow (5YR 6/6) crushed sand, yellowish red (5YR 5/6) crushed moist; weak coarse prismatic structure parting to weak medium subangular blocky; slightly hard, very friable, non sticky, non plastic; common fine, few medium and few coarse roots throughout; few fine discontinuous tubular pores; lamellae 2 to 10 mm thick, 14 to 20 cm apart; color of lamellae is red (2.5YR 4/6); lamellae texture is loamy fine sand with 2 to 3 percent more clay than the matrix; few distinct continuous clay films bridging between sand grains; neutral (pH 7.0); gradual wavy boundary. (0 to 15 inches thick)
C1--43 to 66 inches; reddish yellow (5YR 7/6) sand, reddish yellow (5YR 6/6) crushed moist; structureless, single grained; very friable, non sticky, non plastic; few very fine and few coarse roots throughout; few lamellae less than 2 mm thick, 3 to 7 cm apart; color of lamellae is red (2.5YR 4/6); lamellae are discontinuous; lamellae texture is loamy fine sand with 2 to 3 percent more clay than the matrix; sand grains are coated with silicate clay but no bridging between sand grains; slightly acid (pH 6.5); gradual wavy boundary. (20 to 55 inches thick)
C2--66 to 88 inches; reddish yellow (7.5YR 6/6) sand, strong brown (7.5YR 5/6) crushed moist; structureless, single grained; loose, very friable, non sticky, non plastic; few very fine roots throughout; some faint cross bedding; neutral (pH 7.0); abrupt wavy boundary.
TYPE LOCATION: Woods County, Oklahoma, about 5 miles east and 2 miles north of Waynoka. About 1000 feet west and 550 feet south of the northeast corner of Sec. 34, T. 25 N, R. 15 W.
RANGE IN CHARACTERISTICS: The thickness of the solum ranges from 24 to 50 inches. Free carbonates are lacking within 40 inches of the surface. The solum ranges from moderately acid to neutral. The illuvial horizons contain less than 3 percent more clay than the overlying eluvial horizon. Where lamellae are present, combined thickness of lamellae which are 1 cm or more thick is less than 15 cm.
The A horizon has hue of 7.5YR or 10YR, value of 4 to 6, 3 to 5 moist, and chroma of 1 to 6. It is sand, fine sand, loamy sand, or loamy fine sand. The organic carbon content is less than 0.6 percent.
The E/Bt horizon has hue of 10YR, 7.5YR, or 5YR; value of 4 to 7, 4 or 5 moist; and chroma of 2 to 8. It is sand, fine sand, loamy sand or loamy fine sand that contains less than 3 percent more clay than the A horizon. In some pedons this horizon consists of lamellae. Some pedons have buried soils below 80 inches.
The C horizon has hue of 10YR or 7.5YR, value of 5 to 7, 4 to 6 moist, and chroma of 3 to 8. It is sand, loamy fine sand or fine sand. It is slightly acid or neutral.
COMPETING SERIES: The Derby series is the only competing series in this family. Derby soils have albic horizons and discontinous argillic horizons.
GEOGRAPHIC SETTING: Eda soils are on undulating to rolling dunes on sand sheets on alluvial plains. Slopes commonly are convex, but some are weakly concave. The slope gradient ranges from 0 to 15 percent. The soils formed in sandy eolian deposits, usually many feet thick. The mean annual temperature ranges from 57 to 64 degrees F, and the mean annual precipitation ranges from 22 to 32 inches. Thornthwaite Annual PE Index ranges from 32 to 52. Frost free days range from 190 to 230. Elevation ranges from 1000 to 2200 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Carman, Carwile, Devol, Lovedale, Meno, Ruella, Tivoli and Waynoka soils. Carman and Lovedale soils have mollic surfaces and have fine-loamy control sections. The wetter, fine textured Carwile soils are in nearby depressions. The Devol soils have coarse-loamy control sections and are on slightly less undulating topography. Meno soils have redoximorphic features in the soil profile. Tivoli soils are on steeper slopes and have less developed profiles. Waynoka soils have a lithologic discontinuity within the soil profile.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained. Runoff is negligible on 0 to 5 percent slopes, and very low on 5 to 15 percent slopes. Permeability is rapid.
USE AND VEGETATION: Less sloping areas are usually cultivated; wheat is the principal crop with lesser acreage of grain sorghum and alfalfa. Steeper slopes are mostly in native range. Native vegetation is dominated by sand bluestem, Indiangrass, and little bluestem.
DISTRIBUTION AND EXTENT: Central Rolling Red Plains (MLRA-78C) and Central Rolling Red Prairies (MLRA-80A) North-central and western Oklahoma, southern Kansas and adjacent parts of the Texas Panhandle. The series is of large extent.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Woods County, Oklahoma, 1995.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 0 to 16 inches.
Cambic horizon - the zone between 16 and 43 inches and containing lamellae.
Typic-ustic and udic-ustic moisture regimes.
Soil Interpretation Record: Series OK0431
ADDITIONAL DATA: National Soil Survey Laboratory Sample Number: S89OK-151-002.