LOCATION KLUMP TXEstablished Series
TAXONOMIC CLASS: Fine-loamy, siliceous, active, thermic Udic Argiustolls
TYPICAL PEDON: Klump loamy sand, on a sloping convex 6.0 percent slope in pasture. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 5 inches; dark grayish brown (10YR 4/2) loamy sand, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common wormcasts; common fine roots; few fine pores; slightly acid, clear smooth boundary. (3 to 7 inches thick)
A--5 to 13 inches; brown (7.5YR 4/2) loamy sand, dark brown (7.5YR 3/2) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; common wormcasts; common fine roots; common fine pores; slightly acid; clear smooth boundary. (4 to 15 inches thick)
Bt1--13 to 17 inches; brown (7.5YR 4/2) sandy clay loam, dark brown (7.5YR 3/2) moist; weak medium subangular blocky structure; hard, firm, slightly sticky and slightly plastic; common fine roots; common fine pores; common thick clay films on faces of peds; common wormcasts; vertical tubes of reddish material in wormcasts; slightly acid; clear smooth boundary. (3 to 22 inches thick)
Bt2--17 to 23 inches; dark red (2.5YR 3/6) sandy clay loam, dark red (2.5YR 3/6) moist, dark brown (7.5YR 3/2) ped coatings; moderate medium subangular blocky structure; hard, firm, slightly sticky and slightly plastic; common fine roots; few fine pores; common clay films on faces of peds; strongly acid; gradual smooth boundary. (5 to 22 inches thick)
Bt3--23 to 31 inches; yellowish red (5YR 5/6) sandy clay loam; yellowish red (5YR 4/6) moist; weak medium subangular blocky structure; hard, firm, slightly sticky and slightly plastic; few fine roots; few fine and medium pores; common thick clay films on faces of peds; few vertical tubes of dark brown wormcasts; medium acid; gradual smooth boundary. (0 to 12 inches thick)
BCt--31 to 56 inches; yellowish red (5YR 5/6) sandy clay loam; yellowish red (5YR 4/6) moist; weak coarse subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; few fine roots; few fine pores; thin patchy clay films on faces of peds; medium acid; gradual smooth boundary. (0 to 30 inches thick)
C--56 to 64 inches; yellowish red (5YR 5/8) sandy loam; yellowish red (5YR 4/8) moist; massive; slightly hard, friable, slightly sticky and nonplastic; slightly acid.
TYPE LOCATION: Washington County, Texas; 9 miles east of Brenham on Texas 105; 2.5 miles east on Farm Road 2193; 0.2 mile south on private road, 200 feet east in pasture.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 40 to 60 inches, which is also the depth to sandier material.
The combined A horizons are 10 to 18 inches thick. The A horizon has hue of 10YR or 7.5YR, values 3 to 5, and chromas of 2 or 3. Texture is sandy loam or loamy sand but includes fine sandy loam. Reaction ranges from medium acid to mildly alkaline.
The Bt horizon has hue of 2.5YR to 7.5YR, value of 4 to 6, and chroma of 4 to 8. Mottles of yellowish brown and dark red range from none to common. It contains common ped coatings of dark brown or brown. Texture is clay loam or sandy clay loam with clay content ranging from 20 to 35 percent. Reaction ranges from strongly acid to neutral.
The BCt horizon has hue of 5YR or 7.5YR, value of 5 or 6, and chroma of 6 to 8. Texture is sandy loam or sandy clay loam. Reaction ranges from medium acid to neutral.
The C horizon has hue of 10YR, 7.5YR, or 5YR, value of 5 or 6, and chroma of 6 to 8. Texture is sandy loam fine sandy loam or sandy clay loam. Some pedons range to loamy sand or sand texture. Reaction ranges from medium acid to moderately alkaline. Some pedons have a calcareous, matrix and some pedons have concentrations of calcium carbonate.
COMPETING SERIES: These are the Coyle and Groesbeck series in the same family and the similar Albion, Chickasha, Cuero, Frankirk, Knolle, Ravia, Teller, Willacy, and Zaneis series. Coyle soils have sola 20 to 40 inches thick. Groesbeck soils have a lithic contact between 20 and 40 inches. Albion soils have less than 18 percent clay in the Bt horizon. Chickasha, Ravia, Teller, and Zaneis soils have mixed mineralogy. In addition Chickasha soils have yellower hues. Ravia soils have sola 40 to 60 inches over materials weathered from granite. Zaneis soils have sola 40 to 60 inches thick over thinly bedded sandstone and shale. Cuero soils have mollic epipedons thicker than 20 inches and have mixed mineralogy. Frankirk soils have more than 35 percent clay in the control section. Knolle soils lack mollic epipedons. Willacy soils have mean annual soil temperature of more than 72 degrees F.
GEOGRAPHIC SETTING: Klump soils are on gently sloping to sloping convex uplands. They formed in materials weathered from sandstone of Miocene Age. Slopes are mainly 4 to 7 percent but range from 1 to 8 percent. Mean annual precipitation ranges from 35 to 45 inches and mean annual temperature ranges from 64 to 70 degrees F. Frost free days range from 260 to 280 days and elevation ranges from 200 to 550 feet. Thornthwaite annual P-E indices range from 48 to 64.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the similar Cuero and Knolle soils and the Brenham, Carbengle, and Frelsburg soils. Cuero soils are on footslopes and concave areas. Brenham and Carbengle are on nearly level landscapes, contain less sand and are calcareous throughout. Frelsburg soils have intersecting slickensides. Knolle soils are on similar landscapes.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is medium. Permeability is moderate.
USE AND VEGETATION: Used mainly for improved pasture. A small acreage is in corn and other crops. Native vegetation was little bluestem and other prairie grasses with a few elm, hackberry, honeylocust, and pecan trees.
DISTRIBUTION AND EXTENT: Southeast central Texas. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Washington County, Texas, 1978
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon -- 0 to 17 inches (Ap, A, and Bt1 horizons)
Argillic horizon -- 13 to 31 inches
Udic feature -- soil is in an ustic bordering udic soil moisture area.
ADDITIONAL DATA: National Soil Survey Laboratory: S76TX-477-2 (76PO740-76PO746).