LOCATION BUKREEK TXEstablished Series
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 9 inches; reddish brown (5YR 4/3) loam, dark reddish brown (5YR 3/3) moist; weak fine granular structure; soft, very friable; contains few quartz pebbles; slightly alkaline; abrupt smooth boundary. (10 to 14 inches thick)
Bt1--9 to 16 inches; 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 pebbles; slightly alkaline; gradual smooth boundary. (6 to 15 inches thick)
Bt2--16 to 32 inches; 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 pebbles; few films and threads of calcium carbonate in lower part; slightly alkaline; gradual smooth boundary. (8 to 17 inches thick)
Bt3--32 to 48 inches; 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 pebbles; films and threads of calcium carbonate on ped faces; calcareous; moderately alkaline; gradual wavy boundary. (8 to 20 inches thick)
Btk--48 to 66 inches; 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. (10 to 20 inches thick)
B't1--66 to 89 inches; 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. (15 to 25 inches thick)
B't2--89 to 102 inches; 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.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 60 to over 80 inches. Depth to secondary lime is 24 to 33 inches and to a calcic horizon is 40 to 60 inches.
The A horizon is dark reddish brown (5YR 3/2, 2/2) to brown (7.5YR 5/2) inclusive. Texture of the A horizon is loam or sandy clay loam. Reaction is neutral or slightly alkaline.
Some pedons have AB horizons up to 15 inches thick that have the same color range as the A horizon and textures of sandy clay loam to heavy loam.
The Bt horizons above the calcic horizon have hue of 2.5YR or 5YR, value of 4 or 5, and chroma of 3 through 6. They are sandy clay loam, loam, or clay loam, with clay contents of 25 to 35 percent. Reaction is slightly alkaline or moderately alkaline.
The Btk horizon has hue of 2.5YR through 7.5YR, value of 5 through 7, and chroma of 4 through 6. Textures are the same as the upper Bt horizon. The estimated calcium carbonate content ranges from 15 to 60 percent by volume. The B't horizons below the calcic horizon have hue of 2.5YR or 5YR, value of 4 through 6, and a chroma that is dominantly 6. Texture is sandy clay loam, loam or fine sandy loam.
COMPETING SERIES: These are the Abilene, Acuff, Altus, Amarillo, Dumas, Miles, Motley, Olton, Sagerton, Tipton, and Wichita series. Abilene, Altus, and Tipton soils have mollic epipedons thicker than 20 inches. Acuff, Amarillo, Dumas, and Olton soils occur in regions that have mean annual precipitation of less than 21 inches and a Thornthwaite annual P-E index of 24 to 32, these soils are dry for longer periods during the year than are the Bukreek soils. Miles and Wichita soils lack a mollic epipedon. Motley soils lack carbonates within 36 inches and a calcic horizon within 60 inches. Sagerton soils have more than 35 percent clay in the upper 20 inches of the Bt horizon.
GEOGRAPHIC SETTING: Bukreek soils occur on gentle slopes with gradients less than 3 percent. They are formed in loamy sediments of outwash or old alluvium in the Rolling Plains. The climate is dry subhumid, mean annual precipitation is 21 to 25 inches, Thornthwaite annual P-E index is 32 to 38 and mean annual air temperature is about 57 to 64 degrees F. Frost free days range from 200 to 240. Elevation ranges from 1000 to 3000 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the competing Miles and Wichita soils and the Woodward and Weymouth soils. Woodward and Weymouth soils lack mollic epipedons and argillic horizons.
DRAINAGE AND PERMEABILITY: Well drained; surface runoff is negligible on 0 to 1 percent slopes and low on 1 to 3 percent slopes; permeability is moderate.
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: Western Rolling Plains of Texas and Oklahoma. The series is moderately extensive.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Cottle County, Texas; 1970.
REMARKS: The series was formerly included in the Amarillo, Miles, and Acuff series.
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from 0 to 16 inches.
Argillic horizon - the Bt horizon.
Ustic feature - secondary carbonates occur beginning at 16 inches.
Calcic horizon - the Btk horizon, from 48 to 66 inches.
Pale feature - clay content does not decrease by less than 20 percent and has chroma of 6 at 60 inches depth.