LOCATION HENDRICKS UT+IDEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Pachic Argixerolls
TYPICAL PEDON: Hendricks silt loam, cultivated. (Colors are for air dry soil unless otherwise noted.)
Ap--O to 5 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; moderate medium granular structure that parts to moderate fine granular structure; slightly hard, friable, slightly sticky, plastic; common fine roots; common fine pores; neutral (pH 6.8); abrupt smooth boundary. (5 to 7 inches thick)
A--5 to 15 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky, plastic; common fine roots; common fine and medium and few large pores; slightly acid (pH 6.4); clear smooth boundary. (3 to 12 inches thick)
Bt1--15 to 27 inches; brown (10YR 4/3) silty clay loam, dark brown (10YR 3/3) moist; weak medium prismatic structure that parts to moderate medium subangular blocky structure; hard, firm, sticky, plastic; common fine roots; many fine and few medium pores; thin continuous clay films; slightly acid (pH 6.2); clear wavy boundary. (8 to 20 inches thick)
Bt2--27 to 48 inches; yellowish brown (10YR 5/4) silty clay loam, brown (7.5YR 4/3) moist; weak medium prismatic structure that parts to moderate medium subangular blocky structure; hard, firm, sticky, plastic; few fine roots; many fine pores; thin continuous clay films; slightly acid (pH 6.4); clear smooth boundary. (6 to 19 inches thick)
Bt3--48 to 66 inches; brown (7.5YR 5/4) silty clay loam, brown (7.5YR 4/3) moist; weak fine and medium subangular blocky structure; hard, firm, sticky, plastic; few fine roots; common fine and few medium pores; common thin clay films, slightly acid (pH 6.3).
TYPE LOCATION: Cache County, Utah; one mile south and 1-3/4 miles east of Richmond, Utah; 900 feet east and 50 feet south of the northwest corner of the southeast quarter of sec. 1, T.13N., R.lE.
RANGE IN CHARACTERISTICS: The mollic epipedon is 20 to 40 inches thick. The combined thickness of the A and Bt horizons is 48 to 65 inches or more. Calcareous lake sediments occur at depths below 48 inches in some pedons. The mean annual soil temperature is 47 to 52 degrees F., and the mean summer temperature at about 20 inches depth is 65 to 68 degrees F. The cation exchange capacity/clay ratio is about 0.6 to 0.8. The soils are dry for 45 to 60 consecutive days in the moisture control section following the summer solstice.
The A horizon has value of 3 through 5 dry, 2 or 3 moist and chroma of 1.5 or 2 moist. It has 3 to 5 percent organic matter. It has weak to moderate, fine to medium granular with some medium to coarse subangular blocky structure in the lower part in some pedons. It is neutral to slightly acid.
The Bt horizon has hue of 10YR or 7.5YR, value of 4 through 6 dry, 3 or 4 moist and chroma of 2 through 4 moist and dry. It is silty clay loam or clay loam, with less than 15 percent coarser than very fine sand and with 5 to 10 percent more clay than the A horizon. It has weak to moderate, medium to coarse prismatic breaking to weak to moderate fine to medium subangular blocky structure. It is neutral to slightly acid. It has common to continuous, thin to moderately thick clay films. A few scattered gravel or stones may occur in the lower part of the Bt horizon and C horizon.
The C horizon has hue of 10YR or 7.5YR, value of 5 or 6 dry, 3 or 4 moist and chroma of 2 through 4. It is silty clay loam, clay loam or silt loam.
COMPETING SERIES:
Hanning (WA): particle size control section averages 18 to 27 percent clay
Mohler (ID): formed in loess and the Bt contains lamellae
Van Nostern (WA): has basalt bedrock at 20 to 40 inches
GEOGRAPHIC SETTING: Hendricks soils are at elevations of 4,800 to 5,400 feet above sea level on gently sloping to moderately steep old alluvial fans and lake terraces slightly below to slightly above the highest level of ancient Lake Bonneville. Slopes are 1 to 20 percent. Parent materials are mixed alluvium and lake sediments, dominantly from sandstone and quartzite rocks. The climate is moist subhumid, mean annual temperature is 44 to 48 degrees F., and the mean summer temperature is 65 to 70 degrees F. The average annual precipitation is 16 to 20 inches. The frost-free period is 120 to 140.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Nebeker, and Crowshaw soils and the Hiibner soils. Hiibner soils have very cobbly clay argillic horizons with more than 35 percent coarse fragments and have mollic epipedons less than 20 inches thick.
DRAINAGE AND PERMEABILITY: Well-drained; medium or rapid runoff; moderately slow or moderate permeability.
USE AND VEGETATION: These soils are used primarily as dry cropland for alfalfa and small grains and some areas of rangeland. The native vegetation is big sagebrush, slender wheatgrass, cheatgrass, prairie junegrass, mutton grass, balsamroot and yarrow.
DISTRIBUTION AND EXTENT: Northern Utah and southern Idaho. These soils are inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Cache County (Cache Area), Utah 1969.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface to 27 inches (Ap, A, and Bt1 horizons).
Argillic horizon - the zone from 15 to 66 inches (Bt1, Bt2, and Bt3 horizons).
The classification is based on "Keys to Soil Taxonomy, Eighth Edition, 1998". The Cation Exchange Activity Class is estimated based on the soil interpretive record.