LOCATION CHATBURN ID

Established Series
FRK/GHL
01/2019

CHATBURN SERIES

The Chatburn series consists of very deep, well drained soils that are formed in silty alluvium with some loess influence. They are on coalesced fan terraces and valley floors. Permeability is moderately slow. Slopes are 1 to 4 percent. The average annual precipitation is about 360 mm and the average annual temperature is about 6.7 degrees C.

TAXONOMIC CLASS: Fine-silty, mixed, superactive, frigid Calcic Argixerolls

TYPICAL PEDON: Chatburn silt loam, cultivated; on a one percent smooth
slope at 1,435 meters elevation. When described on August 24, 1982 the soil was dry from the surface to 5 cm and moist below. (Colors are for air dry soil unless otherwise noted.)

Ap1--0 to 13 cm; brown (10YR 5/3) silt loam, dark brown (10YR 3/3) moist; weak very coarse subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine roots; many very fine and common fine tubular pores; slightly alkaline (pH 7.7); clear smooth boundary. (13 to 28 cm thick)

Ap2--13 to 28 cm; brown (10YR 5/3) silt loam, dark brown (10YR 3/3) moist; weak coarse subangular blocky structure; hard, very friable, moderately sticky and moderately plastic; common very fine roots; many very fine and common fine tubular pores; moderately alkaline (pH 8.2); abrupt smooth boundary. (0 to 15 cm thick)

Bt--28 to 36 cm; pale brown (10YR 6/3) silty clay loam, dark brown (10YR 3/3) moist; moderate fine and medium angular blocky structure; hard, very friable, moderately sticky and moderately plastic; common very fine roots; many very fine and common fine tubular pores; common faint clay films on faces of peds and line pores; moderately alkaline (pH 8.4); abrupt smooth boundary. (8 to 13 cm thick)

Btz--36 to 48 cm; very pale brown (10YR 7/3) silt loam, brown (10YR 4/3) moist; moderate coarse and medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine roots; common very fine tubular pores; few faint clay films lining pores; electrical conductivity 3 mmhos; SAR 18; strongly alkaline (pH 8.6); abrupt smooth boundary. (13 to 23 cm thick)

Bkz1--48 to 56 cm; light gray (10YR 7/2) silt loam, brown (10YR 5/3) moist; about 50 percent of plate surfaces have dark brown (7.5YR 4/4 moist) staining; moderate very thick and thick platy structure; very hard, friable, slightly sticky and slightly plastic; common very fine roots; few very fine and fine tubular pores; violently effervescent (24 percent calcium carbonate), carbonate disseminated; electrical conductivity 8 mmhos; SAR 25; strongly alkaline (pH 8.7); abrupt smooth boundary. (8 to 15 cm thick)

Bkz2--56 to 79 cm; light gray (10YR 7/2) silt loam, brown (10YR 5/3) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; few very fine roots; many very fine and few fine tubular pores; about 10 percent hard, friable nodules; violently effervescent (24 percent calcium carbonate), carbonate is segregated into many fine irregularly shaped seams and filaments; electrical conductivity 11 dS/m; SAR 22; moderately alkaline (pH 8.4). (23 to 36 cm thick)

Bkz3--79 to 127 cm; very pale brown (10YR 7/3) silt loam, brown (10YR 4/3) moist; massive; hard and friable; few very fine roots; many very fine and few fine tubular pores; about 5 percent hard, friable nodules; strongly effervescent (21 percent calcium carbonate), carbonate is segragated into common fine irregularly shaped seams and filaments; electrical conductivity 9 mmhos; SAR 21; moderately alkaline (pH 8.3); clear smooth boundary. (36 to 50 cm thick)

Cz--127 to 162 cm; very pale brown (10YR 7/3) silt loam, brown (10YR 4/3) moist; massive; hard, friable, nonsticky and nonplastic; few very fine roots; many very fine and few fine tubular pores; strongly effervescent (19 percent calcium carbonate), carbonate is disseminated; electrical conductivity 8 mmhos; SAR 16; moderately alkaline (pH 8.2)

TYPE LOCATION: Cassia County, Idaho; about 1 mile east of Albion, Idaho, 100 feet east and 200 feet north of the southwest corner of section 33, T. 11 S., R. 25 E.; USGS Albion 7.5 minute topographic quadrangle; latitude 42 degrees 25 minutes 6 seconds N and longitude 113 degrees 32 minutes 42 seconds W; WGS84 Decimal Degrees 42.4183333 latitude, -113.5450000 longitude.

RANGE IN CHARACTERISTICS:
Thickness of the Mollic epipedon - 28 to 43 cm.
Depth to secondary carbonates - 33 to 48 cm.
Depth to platy layer - 41 to 48 cm.
Percent calcium carbonate equivalent in calcic horizon - 20 to 35
Average annual soil temperature - 7.2 to 8.3 degrees C.

A horizons
Chroma - 2 or 3
Clay content - 10 to 18 percent
Reaction - mildly to moderately alkaline

Bt horizons
Color value - 5 through 7 dry
Chroma - 2 through 4
Texture - SIL or SICL
Clay content - 22 to 32 percent
Reaction - moderately to strongly alkaline

Bkz horizons
Color value - 6 through 8 dry, 4 through 6 moist
Chroma - 2 or 3
Clay content - 5 to 15 percent
Calcium carbonate equivalent - 20 to 35 percent
Electrical conductivity - 8 to 16 mmhos
SAR - 15 to 25
Reaction - moderately or strongly alkaline

Cz horizon
Color value - 6 or 7 dry, 4 or 5 moist
Calcium carbonate equivalent - 10 to 20 percent
Electrical conductivity - 8 to 16 mmhos
Reaction - moderately or strongly alkaline

COMPETING SERIES: These are the Bancroft and Thatcher series. All of
these soils lack Bkz horizons and platy structure in the subsoil.
Bancroft soils have secondary carbonate at 48 to 100 cm. Thatcher soils have greater than 25 percent clay in horizons immediately below the Bt and have electrical conductivity of less than 2 mmhos below the Bt.

GEOGRAPHIC SETTING: Chatburn soils are on nearly level to gently
sloping coalesced fan terraces and valley floors. Slopes range from 1
to 4 percent. Elevation ranges from 1,405 to 1,495 meters. The soil formed in silty alluvium with some loess influence. The average annual precipitation ranges from 30 to 41 cm, the average annual air temperature is 6.1 to 7.2 degrees C., the frost free season is 85 to 100 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Downata, Heglar, and
Rexburg series. Downata soils have a Pachic mollic epipedon, lack an argillic horizon and have a water table at 0 to 61 cm. Heglar soils lack a mollic epipedon and an argillic horizon and are mesic. Rexburg soils lack an argillic horizon and platy structure in the
subsoil. Downata soils are on floodplains and low stream terraces.
Heglar soils are on gently to strongly sloping south facing
hillsides. Rexburg soils are on gently to strongly sloping east and
north facing slopes.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained. Slow runoff. Moderately slow saturated hydraulic conductivity.

USE AND VEGETATION: Chatburn soils are used for irrigated crops, range
and wildlife habitat. The native vegetation is Basin big sagebrush,
bluebunch wheatgrass, Sandberg bluegrass, and rabbitbrush.

DISTRIBUTION AND EXTENT: South central Idaho. The soils of this series
is of small extent. MLRA 25.

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

SERIES ESTABLISHED: Cassia County, Idaho, 1986.

REMARKS: This pedon was sampled by the NSSL, Lincoln, NB. Sample
#S82ID-031: The SAR exceeds 13 in the lower part of the argillic, but
does not qualify for a natric because it lacks prismatic structure or
tongues of E material.

Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 28 cm (Ap1 and Ap2 horizons).
Argillic horizon - The zone from 28 to 48 cm (Bt1 and Btz2
horizons).
Calcic horizon - The zone from 48 to 127 cm (Bkz1, Bkz2, and Bkz3
horizons).

Particle-size control section - The zone from 28 to 48 cm (Bt1 and
Btz2).

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.

National Cooperative Soil Survey
U.S.A.