LOCATION LUBBOCK KSEstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, mesic Pachic Argiustolls
TYPICAL PEDON: Lubbock silty clay loam - cultivated. (Colors are for dry soil unless otherwise stated.)
A--0 to 9 inches; dark grayish brown (10YR 4/2) silty clay loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium granular structure; slightly hard, friable; many fine roots; neutral; clear smooth boundary. (8 to 12 inches thick)
Bt1--9 to 18 inches; dark grayish brown (10YR 4/2) silty clay loam, very dark grayish brown (10YR 3/2) moist; moderate fine and medium subangular blocky structure; hard, firm; many fine roots; faint patchy clay films, moderately alkaline; gradual smooth boundary. (6 to 12 inches thick)
Bt2--18 to 24 inches; dark grayish brown (10YR 4/2) silty clay loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure; hard, firm; common fine roots; faint patchy clay films; moderately alkaline; clear smooth boundary. (6 to 12 inches thick)
Bk--24 to 42 inches; grayish brown (10YR 5/2) silty clay loam, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure; hard, friable; few fine roots; common accumulations of lime in fine soft rounded masses; slight effervescence; moderately alkaline; gradual smooth boundary. (12 to 24 inches thick)
C--42 to 51 inches; light brownish gray (10YR 6/2) silty clay loam, dark grayish brown (10YR 4/2) moist; weak medium granular structure to massive; hard, friable; common accumulations of lime in fine soft rounded masses; slight effervescence; moderately alkaline; clear smooth boundary. (6 to 16 inches thick)
Ab--51 to 68 inches; gray (10YR 5/1) silt loam, very dark gray (10YR 3/1) moist; weak medium granular structure to massive; hard, friable; few soft masses of lime; strong effervescence; moderately alkaline.
TYPE LOCATION: Haskell County, Kansas; about 17 miles northeast of Sublette; 500 feet north and 100 feet east of the southwest corner of sec. 13, T. 27 S., R. 31 W.
RANGE IN CHARACTERISTICS: Sola are typically 40 to 45 inches thick and range from 32 to 60 inches in thickness. Depth to free carbonates ranges from 18 to 32 inches. Thickness of the mollic epipedon ranges from 20 to 36 inches and typically includes all of the Bt horizon.
The A horizon has hue of 10YR, value of 3 to 5 and 2 or 3 moist, and chroma of 1 or 2. It typically is silt loam or silty clay loam and less commonly loam or clay loam. This horizon is neutral or mildly alkaline.
The Bt horizon has hue of 10YR, value of 3 to 5 and 2 or 3 moist, and chroma of 1 or 2. It is silty clay loam, clay loam, silty clay or clay averaging between 35 and 45 percent clay. It ranges from neutral to moderately alkaline.
The Bk horizon has hue of 10YR, value of 4 to 6 and 3 or 4 moist, and chroma of 1 or 2. It has the same texture and reaction as the Bt horizon.
The C horizon has hue of 10YR or 2.5Y, value of 5 to 7 and 4 or 5 moist, and chroma of 1 or 2. It is silt loam, silty clay loam, or clay loam and is moderately alkaline with soft accumulations and films of secondary carbonates. The Ab horizon is lacking in some pedons.
COMPETING SERIES: These are the Irwin, Ruidoso, and Tully soils in the same family and the Abilene, Blanket, Brewer, Crete, Detroit, Englewood, Ladysmith, Lofton, McLain, Rago, and Smolan soils. Englewood, LaBrier, Rago, and Ruidoso soils are dry more than half of the time. Crete, Irwin, Smolan, and Tully soils have chroma of 3 or more in their lower sola, have carbonates at greater depths, and more clayey Bt horizons. Abilene, Blanket, Brewer, Lofton, and McLain soils are thermic. Detroit and Ladysmith soils have carbonates at greater depths. In addition, the Ladysmith soils have more clayey Bt horizons.
GEOGRAPHIC SETTING: Lubbock soils are on nearly level to slightly depressional areas of the upland. Slope gradients typically range from 0 to 1 percent. The Lubbock soils formed in old alluvium that has been reworked by wind. Average annual precipitation ranges from about 19 to 26 inches, and the mean annaul temperature ranges from 50 to 57 degrees F. Thornthwaite Annual P-E Index ranges from 28 to 44.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Farnum, Harney, Ness, Richfield, and Ulysses. Farnum soils are fine-loamy. Harney, Richfield and Ulysses soils have mollic epipedons less than 20 inches thick. Ness soils lack argillic horizons and are more clayey.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is slow. Permeability is moderately slow.
USE AND BEGETATION: Lubbock soils are cropped to wheat and sorghum. Native vegetation is mid and short grasses.
DISTRIBUTION AND EXTENT: Western and south central Kansas. The soil is moderately extensive.
MLRA OFFICE RESPONSIBLE: Salina, Kansas
SERIES ESTABLISHED: Hockley County, Texas, 1941.
REMARKS: Diagnostic horizons and features recognized in this pedon are: mollic epipedon - 0 to 24 inches (A, Bt1, Bt2 horizons); argillic horizon - 9 to 24 inches (Bt1, Bt2 horizons); the classification of mixed mineralogy is presumed from the morphology of the series.