LOCATION HUPP UT+IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Calcic Haploxerolls
TYPICAL PEDON: Hupp gravelly silt loam--rangeland. (Colors are for air-dry soil unless otherwise noted.)
Al--0 to 6 inches; grayish brown (10YR 5/2) gravelly silt loam, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure parting to weak fine granular; soft, friable, slightly sticky; common fine and few medium roots; few fine discontinuous pores; 25 percent pebbles; slightly alkaline (pH 7.6); clear smooth boundary. (4 to 8 inches thick)
A2--6 to 13 inches; grayish brown (10YR 5/2) gravelly silt loam, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure parting to weak fine granular; soft, friable, slightly sticky and slightly plastic; few fine and very fine roots; few fine discontinuous pores; 30 percent pebbles; slightly alkaline (pH 7.6); clear smooth boundary. (4 to 8 inches thick)
A3--13 to 18 inches; brown (10YR 5/3) gravelly silt loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure parting to weak medium granular; slightly hard, friable, slightly sticky and slightly plastic; few fine and very fine roots; few very fine discontinuous pores; 30 percent pebbles; slightly calcareous; slightly alkaline (pH 7.8); clear smooth boundary. (3 to 7 inches thick)
Btk--18 to 35 inches; pale brown (10YR 6/3) very gravelly silt loam, brown (10YR 4/3) moist; moderate medium subangular blocky structure; hard, firm, slightly sticky and plastic; few very fine roots; common very fine tubular pores; 60 percent pebbles and cobbles; few thin clay films on faces of peds; moderately calcareous; carbonates are in laminar veins; moderately alkaline (pH 8.0); gradual wavy boundary. (6 to 16 inches thick)
Bk--35 to 60 inches; pale brown (10YR 6/3) extremely gravelly silt loam, brown (10YR 5/3) moist; weak fine and medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; many very fine discontinuous pores; 75 percent pebbles and cobbles; moderately calcareous; carbonates are in veins; moderately alkaline (pH 8.4).
TYPE LOCATION: Box Elder County, Utah; about 1 mile east and 3 miles south from Hupp range headquarters in Hansel Valley; 2,100 feet east and about 1,300 feet north from the southeast corner of sec. 32, T. 13 N., R. 6 W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 47 to 54 degrees F. The soils are usually moist; it is moist in some part of the moisture control section for 60 to 90 consecutive days during the summer months.
The mollic epipedon is 10 to 20 inches thick. The solum is 12 to 32 inches thick. The depth to the calcic horizon is 10 to 24 inches. Rock fragments are mainly pebble and cobble size angular limestone ad sandstone fragments, and generally increases in volume with depth, ranging from 5 to 35 percent in the A horizon, and 35 to 65 percent in the Bw or Btk horizon, and 50 to 90 percent in the Bk horizon.
The A horizon has value of 4 or 5 dry, 2 or 3 moist, and chroma of 2 or 3. It is neutral to moderately alkaline and is noncalcareous to depths of 8 to 16 inches.
The Btk or Bw horizon (when present) has value of 5 or 6 dry and 3 or 4 moist and chroma of 2 through 4. It is very gravelly silt loam, very cobbly silt loam, very gravelly loam or extremely cobbly loam with about 18 to 24 percent clay. The B horizon has 15 to 20 percent pebbles and 25 to 50 percent cobbles. It is moderately alkaline or strongly alkaline, and noncalcareous to moderately calcareous.
The Bk horizon has value of 5 through 7 dry, 3 through 5 moist, and chroma of 2 through 4. It is very gravelly loam, very cobbly loam, extremely cobbly loam, extremely cobbly silt loam or extremely cobbly sandy loam. It is moderately alkaline to very strongly alkaline and moderately calcareous to strongly calcareous.
COMPETING SERIES: These are the Alpowa (WA), Bonnet (CA), Copperton (UT), Hondee (T ID), Lakewin (UT), Middle (UT), Stricker (T ID), and Tammany (T ID) series. Alpowa, Bonnet and Lakewin soils have less than 18 percent clay in the particle-size control section. Also, Bonnet soils have soil temperatures of 54 to 59 degrees F. Copperton soils have calcic horizons that are partially cemented below 20 inches. Hondee soils average 40 to 50 percent rock fragments in the control section. Middle soils have bedrock at depths of 20 to 40 inches. Stricker soils have 24 to 30 percent clay in the particle size control section. Tammany soils have a sand or gravel substratum within 40 inches.
GEOGRAPHIC SETTING: Hupp soils are on hills, alluvial fans, fan remnants and terrace breaks. Slopes range from 0 to 75 percent. Elevation is 4,300 to 6,000 feet. These soils formed in alluvium, dominantly from limestone, quartzite, and sandstone. The climate is dry subhumid. The mean annual temperature is 45 to 53 degrees F., the mean summer temperature is 68 to 70 degrees F., and the freeze-free period is 100 to 140 days. The average annual precipitation is 12 to 16 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Abela, Bingham, DeJarnet, Munk, Sterling, Kearns and Sandall soils. Abela, Munk and Sterling soils are noncalcareous throughout. Bingham soils have an argillic horizon. DeJarnet soils have mollic epipedons more than 20 inches thick. Kearns soils have less than 15 percent sand coarser than very fine sand. Sandall soils have ochric epipedons.
DRAINAGE AND PERMEABILITY: Well-drained; medium runoff; moderately rapid permeability.
USE AND VEGETATION: These soils are used primarily for rangeland, but some areas are used for nonirrigated cropland to produce small grains, alfalfa and crested wheatgrass. The potential vegetation is mainly big sagebrush, bluebunch wheatgrass and Sandberg bluegrass.
DISTRIBUTION AND EXTENT: Northern Utah and southern Idaho. Hupp soils are moderately extensive. MLRA 25 and 28A.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Box Elder County (East Box Elder Area), Utah, 1969.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface of the soil to 18 inches. (A1, A2 and A3 horizons)
Calcic horizon - the zone of calcium carbonate accumulation from 18 to 60 inches. (Btk and Bk horizons)
Classification: Keys to Soil Taxonomy, Eighth Edition, 1998.