LOCATION HARDISTER ID

Established Series
Rev. FRK-GHL
01/2019

HARDISTER SERIES

The Hardister series consists of very deep, well-drained soils that have moderately rapid permeability. They formed in ashy alluvium on valley floors and stream terraces and have slopes of 0 to 8 percent. The average annual temperature is about 7.8 degrees C., and the average annual precipitation is about 360 mm.

TAXONOMIC CLASS: Ashy, glassy, mesic Vitrandic Haploxerolls

TYPICAL PEDON: Hardister ashy fine sandy loam - range. On a 4 percent smooth slope, east aspect, 1,570 meter elevation. (Colors are for air dry soil unless otherwise stated. This profile was described on November 8, 1979.)

A1--0 to 10 cm; grayish brown (10YR 5/2) ashy fine sandy loam, very dark grayish brown (10YR 3/2) moist; moderate medium platy structure parting to moderate fine and medium subangular blocky; slightly hard, very friable, nonsticky and nonplastic; many very fine roots; many very fine irregular pores; slightly alkaline (pH 7.4 with phenol red, pH 6.9 with sodium fluoride); abrupt smooth boundary. (5 to 23 cm thick)

A2--10 to 28 cm; grayish brown(10YR 5/2) ashy sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; many very fine roots; many very fine tubular pores; slightly alkaline (pH 7.4 with phenol red, pH 6.8 with sodium fluoride); clear smooth boundary. (10 to 30 cm thick)

AC1--28 to 58 cm; brown (10YR 5/3) ashy sandy loam, very dark grayish brown (10YR 3/2) moist; massive; slightly hard, very friable, nonsticky and nonplastic; common very fine and few fine roots; common very fine and few fine tubular pores; slightly alkaline (pH 7.4 with phenol red, pH 6.8 with sodium fluoride); clear smooth boundary. (23 to 30 cm thick)

AC2--58 to 84 cm; grayish brown (10YR 5/2) ashy sandy loam, very dark grayish brown (10YR 3/2) moist; massive; slightly hard, very friable, nonsticky and nonplastic; few very fine and fine roots; few very fine tubular pores; slightly alkaline (pH 7.6 with phenol red, pH 6.8 with sodium fluoride); clear smooth boundary. (23 to 71 cm thick)

C1--84 to 114 cm; light brownish gray (10YR 6/2) sandy loam, very dark grayish brown (10YR 3/2) moist; massive; slightly hard, very friable, nonsticky and nonplastic; few very fine and common medium roots; few very fine tubular pores; slightly alkaline (pH 7.6 with phenol red, pH 6.8 with sodium fluoride); clear smooth boundary. (18 to 48 cm thick)

C2--114 to 165 cm; light brownish gray (10YR 6/2) sandy loam, very dark grayish brown (10YR 3/2) moist; massive; slightly hard, very friable; few very fine roots; few very fine tubular pores; few fine carbonate filaments; slightly alkaline (pH 7.8 with phenol red).

TYPE LOCATION: Cassia County, Idaho; about 12 miles southwest of Oakley, Idaho, about 1,000 feet east and 2,000 feet north of the southwest corner, sec. 10, T. 16 S., R. 21 E.; USGS Blue Hill 7.5 minute topographic quadrangle; latitude 42 degrees 02 minutes 48 seconds N and longitude 113 degrees 59 minutes 16 seconds W; WGS84 Decimal Degrees 42.0466667 latitude, -113.9877778 longitude.

RANGE IN CHARACTERISTICS:

Average Annual soil temperature - 8.3 to 10.0 degrees C.
Typic xeric moisture regime.
Thickness of the mollic epipedon - 25 to 46 cm (dark colored below 46 cm, but organic carbon is too low for mollic)
Reaction - with sodium fluoride - less than 9.5

A horizons
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3
Bulk density - 1.10 to 1.25 grams per cubic centimeter
Reaction - mildly to moderately alkaline

AC horizons
Value - 5 or 6 dry, 2 or 3 moist
Chroma - 2 or 3
Texture - Ashy fine sandy loam, ashy very fine sandy loam or ashy loam.
Bulk density - 1.15 to 1.20 grams per cubic centimeter
Reaction - mildly to moderately alkaline

C horizons
Hue - 10YR or 2.5Y
Value - 6 or 7 dry, 3 or 4 moist
Chroma - 2 or 3
Texture - Ashy fine sandy loam, ashy very fine sandy loam or ashy loam.
Pebble content - 0 to 10 percent
Carbonate content - 0 to 10 percent
Reaction - mildly to moderately alkaline

COMPETING SERIES: This is the Hardesty series. These soils have stratifications containing silt loam and very fine sandy loam, loamy very fine sand and fine sandy loams, have mottles below 50 cm, and have bulk densities between 0.80 and 0.85.

GEOGRAPHIC SETTING: Hardister soils are on valley floors and stream terraces. Slopes range from 0 to 8 percent. Elevation ranges from 1,495 to 1,710 meters. The soil formed in alluvium from volcanic ash. The average annual precipitation is about 300 to 410 cm, the average annual air temperature is about 7.2 to 8.3 degrees C., and the frost-free season is 95 to 115 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bluehill, Coalbank, Cottonthomas, Stines, Tomsherry, and Wilsongulch series. Bluehill soils are moderately deep to a paralithic contact. Coalbank, Cottonthomas and Tomsherry soils are frigid. Stines and Wilsongulch soils are skeletal. Tomsherry soils have a duripan at a depth of 50 to 100 cm. Coalbank and Stines soils are on steep northerly slopes, Bluehill and Wilsongulch soils are on steep southerly slopes. Tomsherry soils are on fan terraces.

DRAINAGE AND PERMEABILITY: Well drained. Slow runoff. Moderate or moderately rapid permeability.

USE AND VEGETATION: Hardister soils are used for range. The natural vegetation is basin big sagebrush, Wyoming big sagebrush, Sandberg bluegrass, Nevada bluegrass, and needleandthread.

DISTRIBUTION AND EXTENT: Hardister soils are found in southern Idaho. They are not extensive. MLRA 25

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Cassia County, Idaho, 1986.

REMARKS: Name is after a stream. A nearby pedon was sampled by the NSSL, NSSL Sample S81 ID-031-001.

Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from the surface to 28 cm (A1 and A2 horizons).
Andic feature - greater than 60 percent vitric material.
Sodium fluoride pH - less than 9.5.

Control section - the zone from 25 to 100 cm (part of the A2 horizon, the AC1 and AC2 horizons, and part of the C1 horizon).
Volcanic ash - Greater than 60 percent.

National Cooperative Soil Survey
U.S.A.