LOCATION LELA OK+KSEstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, thermic Udic Haplusterts
TYPICAL PEDON: Lela silty clay--on a 0.5 percent slope in cropland. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 6 inches; dark reddish brown (5YR 3/2) crushed silty clay; dark reddish brown (5YR 2/2) crushed moist; moderate fine angular blocky structure parting to strong fine granular; very hard, firm; common fine roots; moderately acid (pH 6.0); abrupt smooth boundary. (0 to 10 inches thick)
A1--6 to 13 inches; dark reddish brown (5YR 3.2) crushed silty clay; dark reddish brown (5YR 2/2) crushed moist; strong very fine and fine angular blocky structure; very hard, very firm; few fine roots; few very fine and fine constricted tubular pores; neutral (pH 7.0); clear wavy boundary. (4 to 12 inches thick)
Bss1--13 to 34 inches; dark reddish brown (5YR 3/2) crushed silty clay; dark reddish brown (5YR 2/2) crushed moist; moderate medium angular blocky structure parting to strong very fine and fine angular blocky; very hard, very firm; few very fine roots; common very fine and fine constricted tubular pores; common intersecting slickensides tilted at an angle of 20 to 40 degrees; pressure faces on faces of peds; slightly alkaline (pH 7.5); gradual wavy boundary. (10 to 30 inches thick)
Bss2--34 to 42 inches; dark reddish brown (5YR 3/2) crushed; and 20 percent dark reddish gray (5YR 4/2) silty clay; dark reddish brown (5YR 2/2) crushed, and 20 percent dark reddish brown (5YR 3/2) moist; moderate coarse angujlar blocky structure parting to strong very fine and fine angular blocky; very hard, very firm; few very fine and fine roots; few very fine and fine constricted tubular pores; cracks 1cm to 2 cm wide filled with dark reddish brown (5YR 3/2) surface material; common pressure faces on faces of peds, and common intersecting slickensides tilted at an angle of about 45 degrees; moderately alkaline (pH 8.0); gradual wavy boundary. (0 to 15 inches thick)
Bss3--42 to 53 inches; dark reddish gray (5YR 4/2) crushed silty clay; dark reddish brown (5YR 3/2) crushed moist; moderate coarse angular blocky structure parting to strong very fine and fine angular blocky; very hard, very firm; few fine roots; few very fine and fine constricted tubular pores; cracks 0.5cm to 3cm wide filled with dark reddish brown (5YR 3/2) surface material; common pressure faces on faces of peds; and common dark reddish brown (5YR 3/2) intersecting slickensides tilted at an angle of about 45 degrees; moderately alkaline (ph 8.0); clear wavy boundary. (8 to 25 inches thick)
Bkss1--53 to 61 inches; reddish gray (5YR 5/2) silty clay; dark reddish gray (5YR 4/2) moist; moderate coarse angular blocky structure parting to strong very fine and fine angular blocky; very hard, very firm; few fine roots between peds; few very fine constricted tubular pores; cracks 0.5cm to 2cm wide filled with dark reddish brown (5YR 3/2) surface material; common pressure faces on faces of peds, and dark reddish brown (5YR 3/2) intersecting slickensides tilted at an angle of about 30 degrees; few fine rounded calcium carbonate concretions; strongly effervescent (HCL, unspecified) continuous; moderately alkaline (pH 8.0); gradual wavy boundary. (5 to 30 inches thick)
Bkss2--61 to 72 inches; reddish brown (5YR 4/4) silty clay; dark reddish brown (5YR 3/4) moist; moderate coarse angular blocky structure parting to strong very fine and fine angular blocky; very hard, very firm; few fine roots between peds; cracks 1 to 3cm wide filled with dark reddish brown (5YR 3/2) surface material; common pressure faces on faces of peds; reddish brown (5YR 5/3) intersecting slickensides tilted at an angle of about 30 degrees, and few black stains on horizontal faces of peds; common fine rounded calcium carbonate concretions, and common medium rounded calcium carbonate concretions; strongly effervescent (HCL, unspecified) continuous; moderately alkaline (pH 8.0); gradual wavy boundary. (0 to 5 inches thick)
BCss--72 to 87 inches; reddish brown (5YR 4/4) silty clay; dark reddish brown (5YR 3/4) moist; strong coarse angular blocky structure parting to moderate very fine angular blocky; very hard, very firm; few very fine roots between peds; cracks 1 to 3cm wide filled with dark reddish brown (5YR 3/2) surface material, some cracks tilted at about 30 degrees; common pressure faces on faces of peds, and dark reddish brown (5YR 3/2) intersecting slickensides tilted at an angle of about 45 degrees; few fine calcium carbonate concretions, and common medium calcium carbonate concretions; moderately alkaline (ph 8.0).
TYPE LOCATION: Noble County, Oklahoma; about 2 miles north and 6 miles west of Marland, OK. 2,500 feeto south and 50 feet west of the northeast corner of sec. 1, T. 24 N., R. 1 W.
RANGE IN CHARACTERISTICS: Thickness of the solum ranges from 20 to 80 inches. In undisturbed areas, the soil has gilgai microrelief. The cycles of microlows and microhighs are repeated at linear intervals of 6 to 12 feet. The amplitude of the boundary between the A and B horizons grang from about 10 to 40 inches within the limits of the pedon. These soils have cracks at least 0.5cm wide that extend from below 20 inches to the surface during the summer in at least 6 out of 10 years. Intersecting slickensides occur between 10 and 40 inches.
The A horizons haves hue of 5YR to 10YR, value of 2 to 4, and chroma of 1 to 3. Where the A horizons are less than 12 inches thick, the moist value is less than 3.5 to depths of more than 12 inches. Where chromas of 1 occur between depths of 15 inches and 20 inches, the 1 chroma material will make up less than half of the pedon. Texture is silty clay loam, silty clay, or clay. Reaction is slightly acid to slightly alkaline.
The Bw horizons have hue of 5YR to 10YR, value of 3 to 5, and chroma of 2 to 4. Texture is silty clay or clay. Reaction ranges from slightly alkaline to moderately alkaline. Intersecting slickensides range from few to many. Some pedons have distinct or prominent mottles in shades of gray, red, or brown. Calcium carbonate concretions range from 1 to 15 percent by volume. Some pedons are calcareous.
The Bk horizons have hue of 5YR to 10YR, value of 3 to 5, and chroma of 2 to 4. Texture is silty clay or clay. Reaction ranges from slightly alkaline to moderately alkaline. Intersecting slickensides range from few to many. Calclium carbonate in the form of concretions or masses and films range from few to common.
The BC horizon, and the C horizon, where present, has color, texture, and reaction similar to the Bk horizon.
COMPETING SERIES: These are no other known series in the same family.
GEOGRAPHIC SETTING: Lela soils are nearly level to slightly concave flood plain soils in the Central Rolling Red Prairies (MLRA-80A). Slopes are 0 to 1 percent. The soil formed in calcareous clayey alluvium of Pleistocene age.
Mean Annual Precipitation: 26 to 40 inches.
Mean Annual Temperature: 58 to 64 degrees F.
Thornthwaite Annual P-E indices: 44 to 64.
GEOGRAPHICALLY ASSOCIATED SOILS: These are Asher, Braman (proposed), Brewer, Dale, Gaddy, Keokuk, McLain, Miller, Port, Reinach, and Yahola soils. Asher, Braman (proposed), Brewer, Dale, Keokuk, McLain, and Reinach soils occur on similar flood plains. In addition, Asher and Braman (proposed) soils have a fine-silty control section. Brewer Braman (proposed), and McLain soils have an argillic horizon. Dale and Port soils have a fine-silty control section. Gaddy, Miller, Port, and Yahola soils occur on lower flood plains closer to the stream channel. In addition, Gaddy soils have a sandy control section. Keokuk and Reinach soils have a coarse-silty control section. Miller soils lack wedge-shaped structureal aggregates or intersecting slickensides at some depth between 10 and 40 inches, and lack gilgai relief. Yahola soils have a coarse-loamy control section.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow runoff; very slow permeability. These soils are rarely or occasionally flooded for very brief periods during April to October.
USE AND VEGETATION: Mainly cultivated to small grains, grain sorghums, and alfalfa. Minor areas are used for tame pasture or rangeland. Native vegetation consists of tall and mid grasses with a small percentage of hardwood trees. The main trees are pecan, American elm, and eastern cottonwood.
DISTRIBUTION AND EXTENT: Central Rolling Red Prairies of Oklahoma and Kansas. The soil is of moderate extent.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Pawnee County, Oklahoma; 1954.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic Epipedon - the zone from the surface on the soil to 53 inches (A horizon and Bw horizons)
Cambic Horizon - the zone from 13 inches to 72 inches (Bw and Bk horizons)
Slickensides - present in the zone from 13 to 87 inches.
ADDITIONAL DATA: NSSL lab. sample S90OK-103-007, complete characterization.