LOCATION BUKREEK TX+OK

Established Series
Rev. CLN-ERB-JCW
11/2013

BUKREEK SERIES

The Bukreek series consists of very deep, well drained, moderately permeable soils that formed in loamy alluvium of Quaternary age. These soils occur on very gently sloping terraces on dissected plains. Slope ranges from 0 to 3 percent. Mean annual precipitation is about 610mm (24 in) and mean annual temperature is about 17.2 degrees C (63 degrees F).

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Typic Paleustolls

TYPICAL PEDON: Bukreek loam - cultivated. (Colors are for dry soil unless otherwise stated.)

Ap--0 to 23 cm (0 to 9 in); reddish brown (5YR 4/3) loam, dark reddish brown (5YR 3/3) moist; weak fine granular structure; soft, very friable; contains few quartz gravel; slightly alkaline; abrupt smooth boundary. Thickness is 13 to 36 cm (5 to 14 in).

Bt1--23 to 41 cm (9 to 16 in); reddish brown (5YR 4/3) sandy clay loam, dark reddish brown (5YR 3/3) moist; moderate medium subangular blocky structure; slightly hard, friable; common worm casts and pores; few quartz gravel; slightly alkaline; gradual smooth boundary. Thickness is 15 to 38 cm (6 to 15 in).

Bt2--41 to 81 cm (16 to 32 in); reddish brown (5YR 4/4) sandy clay loam; reddish brown (5YR 4/4) moist; moderate medium subangular blocky structure; hard, firm; common worm casts and pores; thin patchy clay films on ped faces; few quartz gravel; few films and threads of calcium carbonate in lower part; slightly alkaline; gradual smooth boundary. Thickness is 20 to 43 cm (8 to 17 in).

Bt3--81 to 122 cm (32 to 48 in); yellowish red (5YR 5/6) sandy clay loam; yellowish red (5YR 4/6) moist; moderate medium subangular blocky structure; hard, friable; patchy clay films; few quartz gravel; films and threads of calcium carbonate on ped faces; calcareous; moderately alkaline; gradual wavy boundary. Thickness is 20 to 51 cm (8 to 20 in).

Btk1--122 to 168 cm (48 to 66 in); red (2.5YR 5/6) sandy clay loam, red (2.5YR 4/6) moist; moderate coarse subangular blocky structure; hard, friable, contains about 20 percent by volume of soft masses and concretions of calcium carbonate ; calcareous; moderately alkaline; diffuse irregular boundary. Thickness is 25 to 51 cm (10 to 20 in).

Btk2--168 to 226 cm (66 to 89 in); red (2.5YR 5/6) loam; red (2.5YR 4/6) moist; weak coarse subangular blocky structure; hard, friable; contains about 2 percent by volume of soft masses and concretions of calcium carbonate; calcareous; moderately alkaline; diffuse smooth boundary. Thickness is 38 to 64 cm (15 to 25 in).

Btk3--226 to 259 cm (89 to 102 in); red (2.5YR 5/6) loam, red (2.5YR 4/6) moist; weak coarse subangular blocky structure; hard, friable; contains less than 1 percent calcium carbonate as films and threads; calcareous; moderately alkaline.

TYPE LOCATION: Cottle County, Texas. 1.8 miles south and 1.75 miles east via Farm Road 1038 from its intersection with U. S. Highway 83 in the south edge of Paducah, then 100 feet west into a cultivated field.. USGS topographic quadrangle: Paducah, TX; Latitude: 33 degrees, 58 minutes, 50.39 seconds N; Longitude: 100 degrees, 16 minutes, 26.48 seconds W; NAD 83.

RANGE IN CHARACTERISTICS:
Soil Moisture: Typic-ustic soil moisture regime.
Mollic epipedon thickness: 25 to 51 cm (10 to 20 in)
Depth to calcic horizon: 102 to 152 cm (40 to 60 in)
Depth to secondary calcium carbonate: 36 to 89 cm (14 to 35 in)

Particle-size control section (weighted average)
Total clay content: 25 to 35 percent

A horizon
Hue: 5YR, 7.5YR
Value: 3 to 5
Chroma: 2 or 3
Texture: loam or sandy clay loam
Reaction: neutral to moderately alkaline (6.6 - 7.8)

AB Horizon (where present)
Hue: 5YR, 7.5YR
Value: 3 to 5
Chroma: 2 or 3
Texture: heavy loam to sandy clay loam
Reaction: neutral to slightly alkaline (6.6 - 7.8)

Bt Horizon
Hue: 2.5YR, 5YR
Value: 3 to 5
Chroma: 3 to 5
Texture: sandy clay loam, clay loam, loam
Total Clay content: 25 to 35 percent
CaCO3 clay content: 0 to 2 percent
Calcium Carbonate equivalent: 0 to 5 percent
Reaction: slightly alkaline to moderately alkaline (7.4 - 8.4)

Upper Btk Horizon
Hue: 2.5YR to 7.5YR
Value: 5 to 7
Chroma: 4 to 6
Texture: sandy clay loam, clay loam, loam
Total clay content: 25 to 35 percent
CaCO3 clay content: 2 to 15 percent
Calcium carbonate equivalent: 15 to 60 percent
Reaction: moderately alkaline (7.9 - 8.4)

Lower Btk Horizon
Hue: 2.5YR or 5YR
Value: 4 to 6
Chroma: dominantly 6
Texture: clay loam, loam, sandy clay loam, fine sandy loam
Total clay content: 15 to 35 percent
CaCO3 clay content: 1 to 5 percent
Calcium carbonate equivalent: 5 to 15 percent
Reaction: moderately alkaline (7.9 - 8.4)

COMPETING SERIES: This is the Motley series in the same family. Similar soils include the Acuff, Altus, Estacado, Farry, Madge, Miles, Texroy, and Tipton series.
Motley soils lack carbonates within 91 cm (36 in) and a calcic horizon within 152cm (60 in).
Acuff soils meet aridic-ustic soil moisture regimes and may contain a kk horizon with 50 percent or more calcium carbonate from 97 to 147 cm (38 to 58 in).
Altus, Texroy and Tipton soils decrease 20 percent or more (relative) from the maximum clay content (noncarbonate clay) within 150 cm (59 in) of the mineral soil surface not meeting the pale feature. These soils also have a mollic epipedon more than 51 cm (20 in) thick.
Estacado soils meet aridic-ustic soil moisture regimes.
Farry and Madge soils decrease 20 percent or more (relative) from the maximum clay content (noncarbonate clay) within 150 cm (59 in) of the mineral soil surface not meeting the pale feature.
Miles soils do not have a mollic epipedon.

GEOGRAPHIC SETTING:
Parent material: loamy alluvium of Quaternary age
Landscape: dissected plains
Landform: nearly level to very gently sloping terraces
Slope: 0 to 3
Mean annual precipitation: 533 to 711 mm (21 to 28 in)
Thornthwaite annual P-E Index: 30 to 38
Mean annual air temperature 13.9 to 18.3 degrees C (57 to 65 degrees F)
Frost-free period: 200 to 240 days
Elevation: 304.8 to 883.9 m (1000 to 2900 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Frankirk, Miles, Sagerton, and Woodward series.
Frankirk and Sagerton soils: these soils have a fine particle-size control section and occur on similar landscape positions.
Miles soils: these soils do not have a mollic epipedon and occur on slightly higher positions on uplands.
Woodward soils: these soils do not have an argillic horizon or mollic epipedon and occur on shoulders and backslopes.

DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderate. Runoff is negligible on 0 to 1 percent slopes and low on 1 to 3 percent slopes.

USE AND VEGETATION: Most of these soils are cultivated. Cotton, grain sorghum, and wheat are the principal crops. Native vegetation consists mainly of midgrass and short grasses such as blue grama, sideoats grama, vine mesquite, and buffalograss with a light to moderate overstory of mesquite.

DISTRIBUTION AND EXTENT: Central Rolling Red Plains, Western and Eastern parts (MLRA-78B & 78C) of Texas and Oklahoma. The series is of moderate extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Cottle County, Texas; 1970.

REMARKS: The series was formerly included in the Amarillo, Miles, and Acuff series.

Edited 11/2013 (RFG-ROG): converted to tabular format and added metrics, updated competing series, geographic setting and associated soils sections.

Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - 0 to 41 cm (0 to 16 in). (A, Bt1 horizons)
Argillic horizon - 23 to 168 (9 to 66 in). (Bt,Btk horizons)
Calcic horizon - 122 to 203 cm (48 to 80 in). (Btk horizons)
Pale feature - clay content decreases by less than 20 percent and has chroma of 6 at 152 cm (60 in) depth.

Taxonomic version: Keys to Soil Taxonomy, Eleventh Edition, 2010

National Cooperative Soil Survey
U.S.A.