LOCATION SPUR TX+OK

Established Series
Rev. EHT-ERB-CRC
01/2017

SPUR SERIES

The Spur series consists of very deep, well drained, moderately permeable soils that formed in calcareous, loamy alluvium. These nearly level to very gently sloping soils occur on floodplains or draws on dissected plains. Slope ranges from 0 to 2 percent. Mean annual precipitation is about 610 mm (24 in) and the mean annual air temperature is about 16.7 degrees C (62 degrees F).

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Fluventic Haplustolls

TYPICAL PEDON: Spur clay loam--pasture.
(Colors are for dry soil unless otherwise stated.)

A--0 to 38 cm (0 to 15 in); brown (7.5YR 4/2) clay loam, dark brown (7.5YR 3/2) moist; moderate medium granular structure; hard, friable; many fine roots; many fine and medium pores; many wormcasts; strongly effervescent; moderately alkaline; gradual smooth boundary. Thickness is 28 to 51 cm (11 to 20 in)

Bk1--38 to 97 cm (15 to 38 in); brown (7.5YR 5/4) clay loam, brown (7.5YR 4/4) moist; moderate fine subangular blocky and moderate fine granular structure; hard, friable; numerous strata of slightly darker material 1/2 to 1 inch thick; many fine roots and pores; many wormcasts; few films, threads, and fine concretions of calcium carbonate; strongly effervescent; moderately alkaline; gradual smooth boundary. Thickness is 25 to 76 cm (10 to 30 in)

Bk2--97 to 127 cm (38 to 50 in); brown (7.5YR 5/4) clay loam, brown (7.5YR 4/4) moist; moderate fine subangular blocky structure; hard, friable; few threads, films, and fine concretions of calcium carbonate; strongly effervescent; moderately alkaline; clear smooth boundary. Combined thickness of the Bk horizons is 51 to 152 cm (20 to 60 in)

Bk3--127 to 152 cm (50 to 60 in); light reddish brown (5YR 6/4) clay loam, reddish brown (5YR 5/4) moist; weak fine subangular blocky structure; hard, friable; few fine concretions of calcium carbonate; strongly effervescent; moderately alkaline.

TYPE LOCATION: Fisher County, Texas; from the intersection of U.S. Highway 180 and Texas Highway 70 in Roby; about 3.5 miles west on U. S. Highway 180, 0.8 mile south on county road, 0.4 mile west on county road, and 100 feet north in pasture.
USGS topographic quadrangle: Roby, Texas;
Latitude: 32 degrees, 43 minutes, 50.39 seconds N;
Longitude: 100 degrees, 26 minutes, 29.52 seconds W;
Datum: WGS84.
UTM Easting 364924.34 m, UTM Northing 3622347.90 m, UTM Zone 14.

RANGE IN CHARACTERISTICS:
Soil moisture: a typic ustic soil moisture regime
Mollic epipedon thickness: 25 to 51 cm (10 to 20 in)
Depth to identifiable secondary carbonate: 28 to 127 cm (11 to 50 in)

Particle-size control section (weighted average):
Clay content: 20 to 35 percent
Sand content: 20 to 60 percent with more than 15 percent fine sand or coarser

A horizon
Hue: 5YR to 10YR
Value: 4 or 5
Chroma: 2 to 4
Texture: clay loam, loam, fine sandy loam
Clay content: 10 to 35 percent
Calcium carbonate equivalent: 0 to 2 percent
Reaction (pH): neutral to moderately alkaline (6.6 to 8.4)

Upper Bk or Bw horizons
Hue: 5YR to 10YR
Value: 3 to 5
Chroma: 2 to 6
Texture: loam, sandy clay loam, clay loam
Clay content: 20 to 35 percent
Identifiable secondary carbonate: 0 to 5 percent, concretions, films, masses, and/or threads
Calcium carbonate equivalent: 0 to 10 percent
Reaction (pH): slightly alkaline to moderately alkaline (7.4 to 8.4)

Lower Bk horizons
Hue: 5YR to 10YR
Value: 5 to 7
Chroma: 3 to 6
Texture: clay loam, loam, sandy clay loam, fine sandy loam;
Other feature: Darker and/or lighter colored strata and sandier layers are common
Clay content: 15 to 35 percent
Identifiable secondary carbonate: 0 to 5 percent, concretions, films, masses, and/or threads
Calcium carbonate equivalent: 2 to 15 percent
Reaction (pH): moderately alkaline (7.9 to 8.4)

COMPETING SERIES: These are the Easpur and Pursley series in the same family. Similar soils include the Bippus, Colorado, Clairemont, Gageby, Port, Rups, and Sprone series.
Easpur and Pursely soils: are moist in the moisture control section for longer periods.
Bippus, Gageby, and Port soils: have a mollic epipedon more than 51 cm (20 in) thick.
Clairemont soils: have a fine-silty particle-size control section and do not have a mollic epipedon.
Colorado soils: do not have a cambic horizon or a mollic epipedon.
Rups soils: have a fine-silty particle-size control section, are saline and somewhat poorly drained.
Sprone soils: are dry in the moisture control section for longer periods.

GEOGRAPHIC SETTING:
Parent material: calcareous, loamy alluvium
Landscape: dissected plains
Landform: flood plains or draws
Slope: 0 to 2 percent
Mean annual precipitation: 508 to 711 mm (20 to 28 in)
Thornthwaite annual P-E index: 32 to 44
Mean annual air temperature: 13.9 to 18.3 degrees C (57 to 65 degrees F)
Frost-free period: 185 to 235 days
Elevation: 304.8 to 792.5 m (1,000 to 2,600 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Clairemont, Colorado, Gageby, and Rups series. These soils all occur on similar landscape positions.

DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderate. Runoff is negligible to low. Spur soils are rarely to frequently flooded for brief to very brief duration.

USE AND VEGETATION: These soils are used for both cropland and rangeland. Principal crops are grain sorghums, cotton, wheat, and alfalfa. Native grasses are blue grama, buffalograss, western wheatgrass, and switchgrass.

DISTRIBUTION AND EXTENT: Northwestern Texas and western Oklahoma; LRR H - Central Great Plains Winter Wheat and Range Region; MLRA 78B & 78C - Central Rolling Red Plains. The series is extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Dickens County, Texas; 1922.

REMARKS: This pedon was originally described in rangeland; however, the land use has changed to farmland.

Edited 01/2017 (RFG-ROG): Changed to tabular format. Added metric measurements. Updated competing series, geographic setting, and associated soils sections.

Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: 25 to 100 cm (10 to 40 in
Mollic epipedon: 0 to 38 cm (0 to 15 in) (A horizon)
Cambic horizon: 38 to 152 cm (15 to 60 in) (Bk1, Bk2, Bk3 horizons)
Identifiable secondary carbonates: 38 to 152 cm (15 to 60 in). (Bk1, Bk2, Bk3 horizons)
Fluventic feature: strata of darker material indicates irregular decrease of organic carbon.

ADDITIONAL DATA: KSSL Data from Greer County, OK User Pedon ID# 02OK055001

Taxonomic Version: Keys to Soil Taxonomy, Twelfth Edition, 2014

National Cooperative Soil Survey
U.S.A.