LOCATION DEJARNET UT+IDEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Calcic Pachic Haploxerolls
TYPICAL PEDON: DeJarnet gravelly silt loam, nonirrigated cropland. (Colors are for dry soil unless otherwise noted.)
Ap1--0 to 4 inches; dark grayish brown (10YR 4/2) gravelly silt loam, very dark brown (10YR 2/2) moist; weak medium and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; common fine roots; about 22 percent gravel; neutral (pH 7.3)l; clear smooth boundary. (4 to 6 inches thick)
Ap2--4 to 10 inches; dark grayish brown (10YR 4/2) gravelly silt loam, very dark brown (10YR 2/2) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine roots; few very fine discontinuous pores; about 25 percent gravel; neutral (pH 6.8); gradual smooth boundary. (3 to 6 inches thick)
Bw--10 to 20 inches; dark grayish brown (10YR 4/2) very gravelly silt loam, very dark brown (10YR 2/2) moist; weak medium subangular blocky structure; slightly hard, firm, slightly sticky and plastic; few fine roots; very fine discontinuous pores; about 50 percent gravel; neutral (pH 7.9) gradual wavy boundary. (5 to 10 inches thick)
Bt1--20 to 28 inches; brown (10YR 4/3) very gravelly loam, dark brown (10YR 3/3) moist; moderate fine subangular blocky structure; hard, firm, slightly sticky and plastic; few fine roots; many fine discontinuous pores; common thin clay films on faces of peds; about 55 percent gravel; mildly alkaline (pH 7.5); gradual wavy boundary. (6 to 8 inches thick)
Bt2--28 to 34 inches; brown (10YR 5/3) very gravelly loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; few thin clay films on faces of peds; about 70 percent gravel and cobble; mildly alkaline (pH 7.6); gradual wavy boundary. (2 to 6 inches thick)
Bk--34 to 60 inches; pale brown (10YR 6/3) extremely gravelly loam, brown (10YR 4/3) moist; massive; hard, very friable, nonsticky and nonplastic; few fine roots; common very fine discontinuous tubular pores; 80 percent gravel and cobble; strongly calcareous, lime is laminar and massive, weakly cemented in places; mildly alkaline (pH 7.8).
TYPE LOCATION: Box Elder County, Utah; about 8 miles north and 2 miles west from the Valley turn-off interstate highway I-80 on Bear River Stake Farm; 1,050 feet west, 250 feet south from east 1/4 corner of section 11, T.14N., R.6W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 48 to 52 degrees F., and the mean summer temperature at 20 inches ranges from 68 to 70 degrees F. The soils are usually moist but are dry for 60 to 90 consecutive days in all parts of the moisture control section. They are moist more than 50 percent of the time the soil temperature is above 41 degrees F. in some part of the moisture control section. The soil moisture regime is xeric bordering on aridic.
The mollic epipedon is 20 to 36 inches thick. The depth to very gravelly or cobbly material ranges from 14 to 20 inches. Coarse fragments are mainly gravel with some cobble size subrounded quartzite, sandstone and limestone fragments, and generally increase in volume with depth ranging from 20 to 35 percent in the A horizons, 30 to 75 percent in the B horizons, and 50 to 90 percent in the C horizons. The control section averages very gravelly loam. The depth to a layer of carbonate accumulation ranges from 20 to 36 inches.
The A horizon has value of 4 or 5 dry, 2 or 3 moist, and chroma of 2 or 3. It is noncalcareous and is neutral to moderately alkaline.
The B horizon is noncalcareous. Hue, value, and chroma range is the same as the A horizon.
The Bk horizon has hue of 10YR or 7.5YR, value of 6 through 8 dry, 3 through 6 moist, and chroma of 2 through 4. It is very gravelly, extremely gravelly, or very cobbly loam, silt loam or sandy loam with 60 to 90 percent coarse fragments. It ranges from mildly to strongly alkaline and is moderately to strongly calcareous and weakly cemented in some pedons.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: DeJarnet soils occur on gently sloping to strongly sloping offshore bars and medium and high lake terraces, at elevations of 4,600 to 5,200 feet. Slopes range from 0 to 10 percent but mainly are 3 to 6 percent. These soils formed in very gravelly and cobbly alluvium, deltaic materials and reworked lacustrine deposits dominantly from quartzite, sandstone, and limestone rocks. The climate is dry subhumid, with an average annual precipitation ranging from 12 to 18 inches. The mean annual temperature is 47 to 50 degrees F., and the mean summer temperature is 65 to 70 degrees F. The frost free season ranges from 110 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bingham, Hupp, Middle, Parleys, Timpanogos, and Sterling soils. Bingham soils have an argillic horizon. Hupp soils are calcareous in the A horizon and the mollic epipedon is less than 20 inches thick. Middle soils have a mollic epipedon less than 20 inches thick. Parleys and Timanogos soils have argillic horizons and lack coarse fragments in the control sections. Sterling soils are calcareous in the A1 horizons and have calcic horizons immediately below the mollic epipedon and lack cambic horizons.
DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.
USE AND VEGETATION: Principally used for nonirrigated cropland to produce small grains, alfalfa and crested wheatgrass. Some areas used for rangeland. The native vegetation is big sagebrush, bluebunch wheatgrass, Sandberg bluegrass, yellowbrush, junegrass, and annual weeds.
DISTRIBUTION AND EXTENT: Northern Utah and southeastern Idaho. DeJarnet soils are inextensive. MLRA 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 in this pedon include:
Mollic epipedon - from the surface to a depth of 30 inches (Ap1, Ap2, Bw, Bt1, Bt2 horizons).
Calcic horizon - the zone from 39 to 60 inches (Bk horizon).
In Utah this series is correlated with Upland range sites.
The superactive cation exchange activity class was added in 03/2003 to the taxonomic classification by the National Soil Survey Center on request of the Reno MLRA office, without review of the soil series property data. The remainder of this document has not been updated.