LOCATION TOBLER                  UT+AZ NM NV

Established Series
Rev. VLM/JAC/AJE/WWJ
12/2015

TOBLER SERIES

The Tobler soils formed in alluvium from sandstone and shale. The Tobler soils are on alluvial fans and flood plains. The average annual precipitation is 9 inches and average temperature is 62 degrees F.

TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, calcareous, thermic Typic Torrifluvents

TYPICAL PEDON: Tobler fine sandy loam - rangeland (Colors are for air dry soils unless otherwise noted.)

Al--0 to 4 inches; red (2.5YR 4/6) light fine sandy loam; dark red (2.5YR 3/6) moist; weak thin platy structure; soft, very friable, nonsticky, nonplastic; common fine and very fine roots; many very fine and fine vesicular pores; slightly calcareous; moderately alkaline (pH 8.0); clear smooth boundary. (1 to 10 inches thick)

C1--4 to 13 inches; red (2.5YR 4/6) fine sandy loam; dark red (2.5YR 3/6) moist; massive; slightly hard, very friable, slightly sticky, slightly plastic; common fine and medium roots; common fine and medium tubular pores; slightly calcareous; moderately alkaline (pH 7.9); clear smooth boundary. (5 to 33 inches thick)

C2--13 to 38 inches; red (2.5YR 4/6) fine sandy loam; dark red (2.5YR 3/6) moist; weak medium subangular blocky structure; slightly hard, very friable, slightly sticky, slightly plastic; common fine and medium roots; common fine and very fine tubular pores; slightly calcareous; moderately alkaline (pH 7.9); clear smooth boundary. (6 to 35 inches thick)

C3--38 to 60 inches; red (2.5YR 4/6) fine sandy loam; dark red (2.5YR 3/6) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky, slightly plastic; few fine and medium roots; common very fine and fine tubular pores; slightly calcareous; moderately alkaline (pH 7.9).

TYPE LOCATION: Washington County, Utah; Warner Valley; 400 feet north of the west 1/4 corner of sec. 8, T.43S., R.14W.

RANGE IN CHARACTERISTICS:

Soil moisture - Intermittently moist in the soil moisture control section during July-August and December-January. Driest during May and June. Typic aridic soil moisture regime.

Mean annual soil temperature: 59 to 67 degrees F.

Mean summer soil temperature: 77 to 82 degrees F.

These soils contain less than 1 percent organic matter

Texture PSCS: fine sandy loam, but thin strata range from loamy fine sand to loam

Gravel content: 10 percent gravel occurs in some pedons.

Al horizon
Hue: 2.5YR or 5YR
Value: 4 through 6 dry, 3 or 4 moist
Chroma: 4 through 6
Reaction: mildly or moderately alkaline

C horizon
Hue: 2.5YR or 5YR
Value: 4 through 6 dry, 3 or 4 moist
Chroma: 4 through 8

COMPETING SERIES: These are the Anthony, Excelsior, Gila, Grabe, , Junction, and Rucker series. Potential competitors that do not yet have CEA class assigned are the Ireteba, Popson, and Victorville series. Anthony, Gila, Grabe, Ireteba, and Rucker soils have dominant hue of 10YR or 7.5YR. Junction soils contain moderate amounts of gypsum in the profile. Excelsior, Popson and Victorville soils receive their precipitation in the winter and are dry in the soil moisture control section from April to December.

GEOGRAPHIC SETTING: The Tobler soils are on alluvial fans and flood plains at elevations of 2,500 to 3,800 feet. Slopes range from 0 to 10 percent. These soils formed in alluvium from sandstone and shale. The average annual precipitation is 8 to 11 inches, occurring mostly as thunderstorms in July and August and gentle rains in November through March. The mean annual temperature is 57 to 65 degrees F. and the mean summer temperature is 80 to 84 degrees F. The average frost-free season is 10 to 195 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Harrisburg, Leeds, Pintura, and St. George soils and the competing Junction soils. Harrisburg soils have a petrocalcic horizon at depths of less than 40 inches. Leeds soils are in a fine-loamy family. Pintura soils have fine sand or loamy fine sand control sections. St. George soils are in a coarse-silty family and are high in gypsum content.

DRAINAGE AND PERMEABILITY: Well-drained; slow runoff; moderately rapid or moderate permeability.

USE AND VEGETATION: Rangeland and irrigated cropland of alfalfa, sugar beets for seed, and small grains. Native vegetation is creosotebush, galleta, filaree, cheatgrass, and annual weeds.

DISTRIBUTION AND EXTENT: Southwestern Utah and southwestern Nevada and possibly adjacent areas in Arizona. This soil occurs in LRR-D, MLRAs 30 and 42. This soil also occurs in LRR-G, MLRA 70. This series is moderately extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: PHOENIX, ARIZONA

SERIES ESTABLISHED: Virgin River Area, Washington County, Utah, 1937.

REMARKS: Diagnostic horizons and features recognized in this pedon are:

Ochric epipedon - The zone from 0 to 4 inches (A1 horizon)

Entisol feature - The absence of diagnostic subsurface horizons

Fluvial feature - Irregular decrease in organic carbon in the zone from 4 to 60 inches (C1, C2, C3 horizons)

The Tobler soils were formerly classified as Alluvial soils.

OSED scanned by NSSQA. Last revised by state 3/72.

Classified according to Soil Taxonomy Second Edition, 1999.

Responsibility for this series was transferred from Davis to Phoenix 12/2015. ET

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National Cooperative Soil Survey
U.S.A.