LOCATION HODAD IDTentative Series
TAXONOMIC CLASS: Coarse-silty, mixed, superactive, mesic Calcidic Haploxerolls
TYPICAL PEDON: Hodad silt loam - cultivated. (Color is for dry soil unless otherwise noted.)
Ap--0 to 7 inches; grayish brown (10YR 5/2) silt loam, very dark grayish brown (10YR 3/2) moist; moderate medium granular structure; soft, friable, slightly sticky and slightly plastic; common fine and medium roots; many fine and very fine irregular pores; slightly alkaline (pH 7.8); gradual smooth boundary. (7 to 12 inches thick)
Bk1--7 to 17 inches; light brownish gray (10YR 6/2) silt loam, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium roots; many very fine and fine tubular pores; slightly calcareous with few faint calcium carbonate filaments; slightly alkaline (pH 7.8); gradual smooth boundary. ( 0 to 10 inches thick)
Bk2--17 to 36 inches; light gray (10YR 7/2) silt loam, grayish brown (10YR 5/2) moist; moderate medium subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; common fine and medium roots; common very fine and fine tubular pores; strongly calcareous (about 30 percent calcium carbonate); slightly alkaline (pH 7.8); abrupt wavy boundary. (10 to 20 inches thick)
2R--36 inches; basalt bedrock, lime coated on upper boundary.
TYPE LOCATION: Power County, Idaho; about 10 miles west of American Falls; SW1/4 NE1/4 section. 27, T.7S., R.29E. Pillar Butte SE USGS Quadrangle; latitude -42 degrees, 47 minutes, 19 seconds N., longitude -113 degrees, 02 minutes, 59 seconds W.; NAD27 zone12.
RANGE IN CHARACTERISTICS:
Thickness of the mollic epipedon - 7 to 12 inches
Depth to calcic horizon - 7 to 20 inches
Average annual soil temperature - 47 to 54 degrees F.
Particle-size control section - 6 to 18 percent clay and less than 15 percent coarser
than very fine sand
Ap horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Reaction - neutral through moderately alkaline
Bk1 horizon
Value 5 or 6 dry, 3 or 4 moist
Chroma 2 or 3 dry or moist
Reaction slightly alkaline to moderately alkaline
Effervescent very slightly to slightly
Bk2 horizons
Hue - 10YR or 2.5Y
Value - 5 through 8 dry, 3 through 7 moist
Chroma - 1 through 3 dry or moist
Clay content - 6 to 18 percent
Reaction - slightly alkaline to very strongly alkaline
Effervescent - strongly to violently
Calcium carbonate equivalent - 15 to 30 percent
COMPETING SERIES: These are the Ellisforde, Mikkalo, Neeley and Ritzville series. Ellisforde, Neeley and Ritzville soils are 40 to over 60 inches deep to a root restrictive layer. Mikkalo soils lack a calcic horizon and have secondary carbonate4s at 16 to 30 inches.
GEOGRAPHIC SETTING: Hodad soils are on loess covered basalt plains at
elevations of 4,300 to 5,000 feet. They formed in loess. Slopes are 2 to 12 percent. The mean annual precipitation is 11 to 13 inches. The mean annual air temperature is 46 to 52 degrees F. The frost free period is 100 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Neeley soils on similar geomorphic positions.
DRAINAGE AND PERMEABILITY: Well drained. Slow to rapid runoff. Moderate
permeability.
USE AND VEGETATION: Hodad soils are used mostly for nonirrigated small grains and alfalfa. Some areas are irrigated for potatoes, sugar beets, and alfalfa, and some are used for rangeland. The native vegetation is bluebunch wheatgrass, Sandberg bluegrass, and big sagebrush.
DISTRIBUTION AND EXTENT: Southern Idaho. MLRA 11. These soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Power County, Idaho, 2005
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone between 0 and 7 inches. (Ap horizon)
Calcic horizon - The zone between 7 and 36 inches. (Bk2 horizon)
Lithic contact - at 36 inches (2R)
Soil moisture regime - aridic bordering on xeric
The Hodad series was originally correlated as Neeley Variant in the Power County Soil Survey, Idaho.