LOCATION BARX UT+AZ COEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Ustic Calciargids
TYPICAL PEDON: Barx very fine sandy loam, on rangeland. (Colors are for dry soil unless otherwise noted.)
A--0 to 3 inches; reddish brown (5YR 5/4) very fine sandy loam, reddish brown (5YR 4/4) moist; weak medium platy structure; soft, friable; common very fine and fine roots; few very fine tubular pores; moderately alkaline (pH 8.0); clear smooth boundary. (2 to 4 inches thick)
AB--3 to 9 inches; reddish brown (5YR 5/4) fine sandy loam, reddish brown (5YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine, few medium roots; common very fine and fine tubular pores; moderately alkaline (pH 8.0); clear smooth boundary. (0 to 7 inches thick)
Bt1--9 to 15 inches; reddish brown (5YR 5/4) sandy clay loam, reddish brown (5YR 4/4) moist; moderate coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine and fine, and few medium roots; common very fine and fine, and few medium tubular pores; common distinct clay films on faces of peds; moderately alkaline (pH 8.0); clear smooth boundary. (6 to 16 inches thick)
Bt2--15 to 23 inches; reddish yellow (5YR 6/6) sandy clay loam, yellowish red (5YR 4/6) moist; moderate coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine and fine roots; few medium tubular pores; many distinct clay films on faces of peds; moderately alkaline (pH 8.0); clear smooth boundary. (6 to 12 inches thick)
Btk--23 to 36 inches; reddish yellow (5YR 6/6) sandy clay loam, yellowish red (5YR 4/6) moist; moderate medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine and fine roots; common very fine and fine tubular pores; few distinct clay films on faces of peds; strongly effervescent; carbonates segregated in filaments; moderately alkaline (pH 8.2); abrupt wavy boundary. (0 to 14 inches thick)
Bk1--36 to 47 inches; pink (5YR 7/4) sandy clay loam, yellowish red (5YR 5/6) moist; massive; hard, friable, moderately sticky and moderately plastic; few very fine and fine roots; common very fine and fine tubular pores; violently effervescent; carbonates in veins; strongly alkaline (pH 8.6); clear wavy boundary. (10 to 36 inches thick)
Bk2--47 to 55 inches; reddish yellow (5YR 6/6) sandy clay loam, yellowish red (5YR 4/6) moist; massive; hard, friable, slightly sticky and slightly plastic; few fine roots; common very fine and fine tubular pores; strongly effervescent; carbonates are disseminated throughout; moderately alkaline (pH 8.4); clear wavy boundary. (6 to 10 inches thick)
Bk3--55 to 60 inches; pink (5YR 7/4) sandy clay loam, yellowish red (5YR 5/6) moist; massive; hard, friable, slightly sticky and slightly plastic; common fine pores; violently effervescent; carbonates are in veins; strongly alkaline (pH 8.6).
TYPE LOCATION: San Juan County, Utah; about 2 miles southeast of the intersection of highway 95 and highway 261; located about 1,700 feet south and 1,600 feet west of the northeast corner of sec. 19, T. 37 S., R. 19 E.
RANGE IN CHARACTERISTICS:
Soil moisture regime: aridic bordering on ustic
Soil temperature regime: mesic
Mean annual soil temperature: 47 to 54 degrees F
Depth to calcic horizon: 12 to 39 inches
Depth to secondary calcium carbonate: 6 to 30 inches
Particle-size control section:
Clay content: 18 to 35 percent
A horizon:
Hue: 2.5YR to 10YR
Value: 4 to 6 (3 to 5 moist)
Chroma: 2 to 6
Texture: very fine sandy loam, fine sandy loam, or loam
Rock fragments: 0 to 25 percent gravel
Reaction: neutral to moderately alkaline
Bt and Btk horizon:
Hue: 2.5YR to 7.5YR
Value: 4 to 7 (3 to 7 moist)
Chroma: 3 to 6
Texture: sandy clay loam, clay loam, or loam
Rock fragments: 0 to 15 percent
Calcium carbonate equivalent: 0 to 15 percent
Reaction: neutral to moderately alkaline
Bk horizon:
Hue: 2.5YR to 7.5YR
Value: 5 to 8 dry (4 to 8 moist)
Chroma: 2 to 6
Texture: very fine sandy loam, fine sandy loam, sandy clay loam, loam, sandy loam, clay loam, or silt loam
Rock fragments: 0 to 35 percent gravel and cobbles
Calcium carbonate equivalent: 15 to 45 percent
Reaction: moderately to very strongly alkaline
COMPETING SERIES: These are the Alvey, Cerrillos, Clovis, Fernando, Flaco, Horchata, Los Alamos, Maysdorf, Millett, Palabria, Progresso, Sanostee, Scholle, Selpats, Solirec, Spenlo, Threetop, Tuweep, and Wineg series.
Alvey soils contain some shale, and have a soil color of 10YR or 2.5Y. Cerrillos soils are driest from October to May. Clovis soils receive more than half of their precipitation between the months of July and October. Fernando soils contain 50 to 80 percent silt in the solum and are in MLRA 51. Flaco, Horchata, Progresso, Sanostee, and Threetop soils are moderately deep. Hiland and Maysdorf soils have less than 15 percent carbonates in the calcic horizon. Los Alamos soils have pumice throughout the profile. Millett soils contain 25 to 75 percent gravel and cobbles in the lower part of the solum. Palabria soils are deep to sandstone. Selpats soils have a skeletal lithologic discontinuity at depths ranging from 15 to 39 inches. Scholle soils contain 15 to 35 percent gravel in the control section. Solirec soils are in MLRA 34 and receive maximum precipitation in spring and fall. Tapia soils contain caliche fragments in the Bt and Bk horizons. Spenlo soils have a MAST between 54 to 58 degrees F. Tuweep soils are yellower than 5YR and formed in alluvium from pyroclastics and basalt. Wineg soils have a MAST of 56 degrees F, and have mixed gravely alluvium or lacustrine parent material.
GEOGRAPHIC SETTING:
Parent material: reworked eolian material and alluvium derived from sandstone
Landform: alluvial fans, terraces, hills, mesas and structural benches
Slopes: 0 to 15 percent
Elevation: 4,400 to 7,800 feet
Mean annual temperature: 45 to 55 degrees F
Mean annual precipitation: 8 to 14 inches
Precipitation is fairly evenly distributed throughout the year with July and August being slightly wetter and June being slightly dryer.
Frost-free period: 100 to 175 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Abra, Begay, Mivida, Rizno, Sazi, Strych, and Windwhistle soils. Abra soils lack an horizon of clay accumulation. Begay and Mivida soils have coarse-loamy particle size control sections. Sazi and Windwhistle soils have bedrock at a depth of 20 to 40 inches deep. Strych soils have more than 35 percent rock fragments in the particle size control section.
DRAINAGE AND PERMEABILITY: well drained, negligible to high runoff, moderate or moderately slow permeability
USE AND VEGETATION: These soils are used mainly for rangeland. The potential vegetation is Indian ricegrass, galleta, Wyoming big sagebrush, and winterfat.
DISTRIBUTION AND EXTENT: Southeast Utah and southwest Colorado. LRR D, MLRA 34, 35, 36. This series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Lakewood, Colorado
SERIES ESTABLISHED: Utah-Central Part, Grand County, Utah 1985. The name comes from the Bar X wash.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
ochric epipedon: The zone from 0 to 3 inches. (A)
argillic horizon: The zone from 9 to 36 inches. (Bt1, Bt2, and Btk)
calcic horizon: The zone from 36 to 60 inches. (Bk1, Bk2, Bk3)
Particle size control section: The zone from 9 to 29 inches. (Bt1, Bt2, Btk)
Soil Taxonomy Second Edition, 1999
ADDITIONAL DATA: Lab sampled S93CO083003.