LOCATION ROGERSON                ID

Established Series
Rev. DFA-CLM-JVC
10/2019

ROGERSON SERIES

The Rogerson series consists of shallow to a duripan, well drained soils that formed in alluvium derived from mixed sources. Rogerson soils are on terraces. Slopes are 2 to 6 percent. The mean annual precipitation is about 280 mm and the mean annual temperature is about 8.3 degrees C.

TAXONOMIC CLASS: Clayey, smectitic, mesic, shallow Abruptic Xeric Argidurids

TYPICAL PEDON: Rogerson silt loam--on a slope of 2 percent in a seeding of crested wheatgrass at 1,525 meter elevation--rangeland. (Colors are for dry soil unless otherwise noted. When described on September 30, 1977, the soil profile was slightly moist to 10 cm and dry below.)

AE--0 to 10 cm; pale brown (10YR 6/3) silt loam, dark brown (10YR 3/3) moist; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine tubular pores; neutral (pH 7.0); abrupt smooth boundary. (8 to 15 cm thick)

Bt1--10 to 25 cm; brown (10YR 5/3) silty clay, dark brown (10YR 4/3) moist; moderate medium angular blocky structure; very hard, very firm, very sticky and very plastic; many very fine and fine roots; common very fine tubular pores; many distinct clay films on faces of peds and lining pores; neutral (pH 7.2); abrupt smooth boundary. (10 to 25 cm thick)

Bt2--25 to 38 cm; pale brown (10YR 6/3) silty clay, brown (10YR 4/3) moist; moderate medium angular blocky structure; hard, firm, very sticky and very plastic; common very fine and fine roots; common very fine tubular pores; few faint clay films on faces of peds and lining pores; 5 percent gravel; neutral (pH 7.2); clear wavy boundary. (8 to 25 cm thick)

Bkqm--38 to 53 cm; very pale brown (10YR 7/3) duripan, brown (10YR 5/3) moist; massive; very hard, very firm; cemented by secondary silica and carbonates; many very hard weakly to moderately cemented durinodes 6 to 12.5 mm in diameter; very thin indurated laminar cap at top of horizon; strongly effervescent (21 percent calcium carbonate equivalent); moderately alkaline (pH 8.4); gradual wavy boundary. (8 to 18 cm thick)

Bk1--53 to 112 cm; very pale brown (10YR 7/3) silt loam, brown (10YR 5/3) moist; massive; hard, firm, slightly sticky and slightly plastic; few very fine irregular pores; secondary carbonates segregated as common fine to medium filaments; strongly effervescent (23 percent calcium carbonate equivalent); moderately alkaline (pH 8.4); gradual wavy boundary. (41 to 61 cm thick)

Bk2--112 to 157 cm; very pale brown (10YR 7/3) gravelly sandy loam, brown (10YR 5/3) moist; massive; hard, firm, slightly sticky and slightly plastic; few very fine irregular pores; 15 percent gravel; strongly effervescent (53 percent calcium carbonate equivalent); strongly alkaline (pH 8.6).

TYPE LOCATION: Twin Falls County, Idaho; about 14 miles east of Hollister; about 1,100 feet north and 560 feet east of the southwest corner section 25, T. 12 S., R. 17 E.; USGS McMullen Basin 7.5 minute topographic quadrangle; latitude 42 degrees 20 minutes 55 seconds N and longitude 114 degrees 25 minutes 06 seconds W; WGS84 Decimal Degrees XX.XXXXXX latitude, XXX.XXXXXX longitude.

RANGE IN CHARACTERISTICS:

Soil moisture - Moist in winter and spring, dry in summer and fall; aridic moisture regime that borders on xeric.
Mean annual soil temperature - 8.3 to 10.0 degrees F.
Ochric epipedon thickness - 8 to 15 cm.
Depth to base of argillic horizon - 10 to 20 inches.

Depth to duripan - 25 to 50 cm.
Depth to bedrock - more than 152 cm.

Particle-size control section - Clay content: 38 to 55 percent.

Abrupt textural change - An abrupt horizon boundary is normally present between the AE horizon and the Bt1 horizon accompanied by an increase in clay content of more than 20 percent.


AE horizon
Value: 5 or 6 dry, 3 or 4 moist.
Chroma: 2 or 3, dry or moist
Clay content: 15 to 20 percent.
Structure: Granular or platy.


Bt horizons
Value: 4 through 6 dry, 3 or 4 moist.
Chroma: 3 or 4, dry or moist
Texture: Silty clay, clay, or silty clay loam.
Clay content: 38 to 55 percent.
Rock fragments: 0 to 10 percent gravel.
Structure: Prismatic or angular blocky.


Bkqm horizon - Cementation class: The matrix is weakly to strongly cemented silty material with a 3 to 6 millimeter thick indurated laminar cap.
Other features: This horizon is also a petrocalcic horizon.

COMPETING SERIES: These are the Antholop, Esmod, Fulstone, Grassycan, Kunaton, Puls, and Ridenbaugh series.

Antholop soils are moist for more than 10 days between July and October, have thick indurated duripans, and have moderately alkaline or strongly alkaline argillic horizons. Esmod soils have duripans that are more than 100 cm thick. Fulstone soils have duripans that are 18 to 66 cm thick and have skeletal material under the duripan. Grassycan soils have lithic contacts at depths of 18 to 36 cm. Kunaton soils have horizons with identifiable secondary carbonates above the duripan and have lithic contacts under the duripan at depths of 50 to 100 cm. Puls soils do not have AE horizons, have hue of 5YR or 7.5YR in the argillic horizon, and have lithic contacts at depths of 28 to 152 cm. Ridenbaugh soils have horizons with identifiable secondary carbonates above the duripan and have mean annual soil temperature of 10.6 to 12.2 degrees C.

GEOGRAPHIC SETTING: Rogerson soils are on terraces. These soils formed in alluvium derived from mixed sources. Slopes are 2 to 6 percent. Elevations range from 1,375 to 1,680 meters. The mean annual precipitation is 250 to 360 mm, mean annual temperature is 7.2 to 8.9 degrees C., and the frost-free period is 100 to 120 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Minveno, Nawt, Schnipper, and Stricker soils. Minveno soils occur on lower terraces and lack argillic horizons. Nawt and Stricker soils occur on breaks, and do not have duripans. Schnipper soils are fine-loamy, moderately deep to duripans, and occur on the same landform.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; high surface runoff; slow saturated hydraulic conductivity.

USE AND VEGETATION: Rogerson soils are used for rangeland. The native vegetation is bluebunch wheatgrass, Sandberg's bluegrass, black sagebrush, and Wyoming big sagebrush.

DISTRIBUTION AND EXTENT: South-central Idaho. These soils are not extensive with about 1,800 acres of the series mapped to date. MLRA 25.

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

SERIES ESTABLISHED: Twin Falls County, Idaho, 1992.

REMARKS: This revision of March 2001 updates the taxonomic class from Clayey, smectitic, mesic, shallow Abruptic Xerollic Durargids.


Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from the soil surface to 10 cm(AE horizon).
Argillic horizon - The zone from 10 to 38 cm (Bt1 and Bt2 horizons).

Abrupt textural change - The abrupt clay increase of more than 20 percent at 10 cm (between AE and Bt1 horizon).
Duripan - The zone from 38 to 53 cm (Bkqm horizon).

Particle-size control section - The zone from 10 to 38 cm (Bt1 and Bt2 horizons).

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National Cooperative Soil Survey
U.S.A.