LOCATION WESPUR                  OK+KS TX

Tentative Series
SLM-JTB-CPH
03/2017

WESPUR SERIES

The Wespur series consists of very deep, well drained, moderately permeable soils that formed in loamy calcareous alluvium of Holocene age. These soils are on nearly level to very gently sloping floodplains in the Southern High Plains, Breaks (MLRA 77E). The slope ranges from 0 to 3 percent. Mean annual precipitation is about 530 mm (21 in), and mean annual air temperature is about 15 degrees C (59 degrees F).

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

TYPICAL PEDON: Wespur loam - on a 1 percent linear slope, on tread of flood plain step, in native rangeland at an elevation of 725 m (2379 ft).
(Colors are for dry soil unless otherwise stated.)

A--0 to 33 cm (0 to 13 in); brown (7.5YR 4/3) clay loam, dark brown (7.5YR 3/3), moist; moderate medium subangular blocky structure; slightly hard, friable; common very fine, common fine, and few medium roots throughout; slightly effervescent (1 percent calcium carbonate equivalent); slightly alkaline, pH 7.6; clear smooth boundary. (18 to 46 cm thick [7 to 18 in])

Bk1--33 to 61 cm (13 to 24 in); brown (7.5YR 5/3) clay loam, brown (7.5YR 4/3), moist; moderate medium subangular blocky structure; hard, friable; common very fine, common fine, and few medium roots throughout; few percent fine faint threadlike carbonate masses throughout; strongly effervescent (6 percent calcium carbonate); moderately alkaline, pH 8.4; gradual smooth boundary.

Bk2--61 to 97 cm (24 to 38 in); brown (7.5YR 5/2) clay loam, brown (7.5YR 4/2), moist; moderate medium subangular blocky structure; hard, friable; few fine and few medium roots throughout; common fine distinct threadlike carbonate masses throughout; strongly effervescent (4 percent calcium carbonate equivalent); moderately alkaline, pH 8.4; gradual smooth boundary.

Bk3--97 to 152 cm (38 to 60 in); brown (7.5YR 5/3) clay loam, brown (7.5YR 4/3), moist; weak medium subangular blocky structure; hard, friable; few fine and few medium roots throughout; few fine faint threadlike carbonate masses throughout; slightly effervescent (3 percent calcium carbonate equivalent); moderately alkaline, pH 8.4; clear smooth boundary. (Combined thickness of the Bk (and associated Bkb) horizons: 40 to 165 cm [16 to 65 in])

C--152 to 203 cm (60 to 80 in); brown (7.5YR 5/4) sandy loam, brown (7.5YR 4/4), moist; structureless massive; slightly hard, friable; slightly effervescent (1 percent calcium carbonate equivalent); moderately alkaline, pH 8.2.

TYPE LOCATION: Beaver County, Oklahoma; from the intersection of highway 270 and the Harper County line, 2 miles west and 4 miles south; then 1096 ft (334 m) south and 417 ft (127 m) east of the northwest corner of Section 15, Township 1N, Range 28E (Cimarron meridian).

USGS topographic quadrangle: Slapout, Oklahoma
Latitude: 36 degrees 33 minutes 17.36 seconds N
Longitude: 100 degrees 2 minutes 21.13 seconds W
Datum WGS84

Decimal Degrees
Latitude: 36.5548210
Longitude: -100.0391998

UTM Northing: 4045993
UTM Easting: 406998
UTM zone 14S

RANGE IN CHARACTERISTICS:
Solum thickness: greater than 200 cm (greater than 80 in)
Thickness of mollic epipedon: 18 to 46 cm (7 to 18 in)
Depth to secondary carbonates: 20 to 64 cm (8 to 25 in)
Thickness of cambic horizon: 40 to 165 cm (16 to 65 in)

Particle-size control section (weighted average):
Section range: 25 to 100 cm (10 to 40 in)
Silicate clay: 18 to 26 percent
Clay-sized carbonate: 1 to 4 percent
Coarse-fragments: amount-0 to 3 percent; size-fine to coarse gravels; kind-indurated well-rounded quartzite, feldspar, ironstone, and sandstone, strongly cemented angular caliche and petrocalcic fragments

Surface Fragments: amount-0 to 5 percent; size-fine to coarse gravels; kind-indurated well-rounded quartzite, feldspar, ironstone, and sandstone, and or strongly cemented caliche fragments

A and Ap horizons:
Hue: 7.5YR or 10YR
Value: 3 to 5, 2 to 3 moist
Chroma: 1 to 3 moist or dry
Texture: sandy loam, fine sandy loam, very fine sandy loam, loam, clay loam
Coarse fragments: amount-0 to 3 percent; size-fine to coarse gravel; kind-indurated well-rounded quartzite, feldspar, ironstone, and sandstone, or strongly cemented caliche fragments
Identifiable calcium carbonate: none
Calcium carbonate equivalent: 0 to 1 percent
Effervescence: none to slight
Reaction (pH): neutral to slightly alkaline (6.6-7.3)

Bw horizons (where present):
Hue: 7.5YR or 10YR
Value: 4 or 5, 2 to 4 moist
Chroma: 1 to 6 most or dry
Texture: sandy clay loam, loam, and clay loam
Coarse fragments: amount-0 to 3 percent; size-fine to coarse gravel; kind-indurated well-rounded quartzite, feldspar, ironstone, and sandstone or strongly cemented caliche fragments
Identifiable calcium carbonate: none
Calcium carbonate equivalent: 0 percent
Effervescence: none to very slight
Reaction (pH): neutral to slightly alkaline (6.6-7.3)

Bk horizons:
Hue: 7.5YR or 10YR
Value: 4 to 6, 3 to 5 moist
Chroma: 2 to 4 moist or dry
Texture: : sandy clay loam, loam, and clay loam
Coarse fragments: amount-0 to 5 percent; size-fine to coarse gravel; kind-indurated well-rounded quartzite, feldspar, ironstone, and sandstone, or strongly cemented caliche fragments
Identifiable calcium carbonate: amount-1 to 10 percent; size-fine to medium; kind- carbonate films, masses, and nodules
Calcium carbonate equivalent: 1 to 10 percent
Effervescence: slight to violent
Reaction (pH): slightly alkaline to moderately alkaline (7.4-8.4)

C, Ck, or BCk horizons (where present):
Hue: 7.5 or 10YR
Value: 4 to 7, 3 to 6 moist
Chroma: 2 to 8 moist or dry
Texture: sand, fine sand, loamy sand, sandy loam, fine sandy loam, loam, and clay loam (stratified textures possible)
Coarse fragments: amount-0 to 10 percent; size-fine to coarse gravel; kind-indurated well-rounded quartzite, feldspar, ironstone, and sandstone, or strongly cemented caliche fragments
Identifiable calcium carbonate: amount-0 to 5 percent; size-fine to medium; kind- carbonate films, masses, and nodules
Calcium carbonate equivalent: 0 to 8 percent
Effervescence: none to violent
Reaction (pH): slightly alkaline to strongly alkaline (7.4-9.0)

COMPETING SERIES: These are the Sprone (TX) and Toyah (TX) soils. Similar series are the Easpur (OK), Pursley (TX), and Spur (TX) soils.
Sprone soils: formed in alluvial sediments of the Blackwater Draw formation, and do not have coarse-fragments in the profile
Toyah soils: are drier in the control section for longer periods of time
Easpur, Pursley, and Spur soils: are moist in the control section for longer periods of time

GEOGRAPHIC SETTING:
Parent Material: Loamy alluvium of Holocene age.
Landscape: alluvial plain remnants; river valleys
Landform: floodplains
Slope: 0 to 3 percent
Soil moisture: An ustic moisture regime bordering on aridic. The soil moisture control section is dry in some or all parts for more than 180 but less than 220 days, cumulative, in normal years. July through August and December through February are the driest months. These soils are intermittently moist in September through November and March through June.
Mean annual air temperature: 14 to 16 degrees C (57 to 61 degrees F)
Mean annual precipitation: 381 to 660 mm (15 to 26 in)
Frost-free period: 180 to 210 days
Elevation: 600 to 1500 m (1968 to 4921 ft)
Thornthwaite annual P-E Index: 25 to 36

GEOGRAPHICALLY ASSOCIATED SOILS:
These are the Duckpond(T), Gilhula(T), Guadalupe, Persimmon(T), Sweetwater, and Touzalin(T) series on similar landscape positions.
Duckpond soils: have a mollic epipedon greater than 50 cm (20 in) thick, and a fine-silty particle-size class
Gilhula soils: have a coarse-loamy particle-size class
Guadalupe soils: have an ochric epipedon, and a coarse-loamy particle-size class
Persimmon soils: have an ochric epipedon, a coarse-loamy particle-size class, and seasonal endosaturation within 100 cm (40 in) of the soil surface
Sweetwater soils: have a fine-loamy over sandy strongly contrasting particle-size class; and endosaturation within 100 cm (40 in) of the soil surface
Touzalin soils: have an ochric epipedon, a sandy particle-size class, and seasonal endosaturation within 100 cm (40 in) of soil surface

DRAINAGE AND PERMEABILITY:
Drainage: well drained
Permeability: moderate
Runoff: negligible on slopes less than 1 percent and low on 1 to 3 percent slopes
Flooding: frequency-frequent to rare; duration-extremely brief to very brief during the spring and summer months

USE AND VEGETATION: These soils are used for both cropland and livestock grazing. Principal crops are wheat, grain sorghum, alfalfa, and sorghum/sudan grass. Native vegetation is predominantly purple threeawn, little bluestem, silver bluestem, side oats grama, sand bluestem, blue grama, and broom snakeweed. Yucca is the major woody species along with small amounts of sand sagebrush.

DISTRIBUTION AND EXTENT: Southern High Plains, Breaks (MLRA-77E in LRR H) of northwestern Oklahoma, the Texas and Oklahoma Panhandles, and adjacent areas of Southwestern Kansas. This soil is moderately extensive.

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

SERIES PROPOSED: Beaver County, OK 2008. The name of the series comes from a contraction of the words "West" and "Spur".

REMARKS:
These soils were formerly included in the Spur series.

Diagnostic horizons and features in this pedon:
Mollic epipedon: 0 to 33 cm (0 to 13 in) (A horizon)
Secondary carbonates: 33 to 152 cm (13 to 60 in) (Bk1, Bk2, and Bk3 horizons)
Cambic horizon: 33 to 152 cm (13 to 60 in) (Bk1, Bk2, and Bk3 horizons)

ADDITIONAL DATA: None

TAXONOMIC VERSION: Keys to Soil Taxonomy, Twelfth Edition, 2014.

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National Cooperative Soil Survey
U.S.A.