LOCATION REAGAN                  TX

Established Series
Rev. EHT-HO-JRC-ERB
09/2016

REAGAN SERIES

The Reagan series consists of very deep, well drained, moderately or moderately slowly permeable calcareous soils that formed in alluvium and/or eolian deposits derived from limestone. These nearly level to gently sloping soils occur on broad flats, filled valleys and fans. Slopes range from 0 to 3 percent. Mean annual precipitation is about 381 mm (15 in), and mean annual air temperature is about 17.2 degrees C (63 degrees F).

TAXONOMIC CLASS: Fine-silty, mixed, superactive, thermic Ustic Haplocalcids

TYPICAL PEDON: Reagan loam--rangeland.
(Colors are for dry soil unless otherwise stated.)

A1--0 to 8 cm (0 to 3 in); brown (10YR 5/3) loam, dark brown (10YR 3/3) moist; weak fine and medium granular structure; slightly hard, friable; moderately sticky; moderately plastic; common fine roots; 10YR 6/2 (4/2 moist) surface crust about 3 mm thick, strongly effervescent; moderately alkaline; clear smooth boundary.

A2--8 to 20 cm (3 to 8 in); brown (7.5YR 5/3) loam, dark brown (7.5YR 3/3) moist; moderate fine and very fine subangular blocky structure; slightly hard, friable; moderately sticky; moderately plastic; few fine roots; many fine tubular pores (old root channels); common fine wormcasts and insect casts; strongly effervescent; moderately alkaline; diffuse smooth boundary. Combined thickness of A horizons is 10 to 30 cm (4 to 12 in)

Bw1--20 to 43 cm (8 to 17 in); brown (7.5YR 5/3) clay loam, brown (7.5YR 4/3) moist; weak coarse prismatic structure parting to moderate fine and medium subangular blocky; hard, friable; moderately sticky; moderately plastic; few fine roots; common fine wormcasts and insect casts partially filled with material of same color as A2 horizon; few fine threads of calcium carbonate; strongly effervescent; moderately alkaline; diffuse smooth boundary. Thickness is 15 to 71 cm (6 to 28 in)

Bw2--43 to 76 cm (17 to 30 in); light brown (7.5YR 6/4) clay loam; brown (7.5YR 5/4) moist; weak coarse prismatic structure parting to moderate fine and medium subangular blocky; hard, friable; moderately sticky; moderately plastic; few fine roots; common fine wormcasts and partially filled insect casts; few fine threads of calcium carbonate; strongly effervescent; moderately alkaline; clear wavy boundary. Combined thickness of Bw horizons is 20 to 81 cm (8 to 32 in)

Bk1--76 to 94 cm (30 to 37 in); pink (7.5YR 7/3) clay loam; brown (7.5YR 5/3) moist; weak coarse prismatic structure parting to weak medium subangular blocky; hard, friable; moderately sticky; moderately plastic; 20 percent pinkish white (7.5YR 8/2) fine masses and 5 percent fine very weakly cemented concretions of calcium carbonate; 3 percent krotovinas; violently effervescent; moderately alkaline; diffuse wavy boundary. Thickness is 25 to 76 cm (10 to 30 in)

Bk2--94 to 127 cm (37 to 50 in); light yellowish brown (10YR 6/4) clay loam, yellowish brown (10YR 5/4), moist; weak coarse prismatic structure parts to weak medium subangular blocky; hard, friable, moderately sticky, moderately plastic; 30 percent fine and medium masses and 5 percent fine very weakly cemented concretions of calcium carbonate; violently effervescent; moderately alkaline; diffuse wavy boundary. Combined Thickness of Bk horizons is 51 to more than 152 cm (20 to 60 in)

Bk3--127 to 203 (50 to 80 in); light yellowish brown (10YR 6/4) clay loam; yellowish brown (10YR 5/4) moist; weak coarse prismatic structure parting to weak medium subangular blocky; hard, friable; moderately sticky; moderately plastic; 3 percent fine masses and 2 percent fine very weakly cemented concretions of calcium carbonate; strongly effervescent; moderately alkaline.

TYPE LOCATION: Upton County, Texas; from the intersection of US Highway 67 and Texas Highway 349 in Rankin, about 21.5 miles north on Texas Highway 349 to intersection with FM 2401, 4.2 miles east on FM 2401 to fence; 500 feet south-southeast along fence, then 150 feet east of fence in rangeland (about 9.0 miles south and west of Midkiff along Farm Road 2401).
USGS topographic quad: Midkiff SW, Texas;
Latitude: 31 degrees, 32 minutes, 45.6 seconds N;
Longitude: 101 degrees, 52 minutes, 55.2 seconds W.
Datum: WGS84.
UTM Easting 226394.3 m, UTM Northing 3493717 m, UTM Zone 14N.

RANGE IN CHARACTERISTICS:
Soil Moisture: Ustic Aridic
Depth to cambic horizon: 10 to 30 cm (4 to 12 in)
Depth to calcic horizon: 38 to 102 cm (15 to 40 in)

Particle-size control section (weighted average)
Silicate clay content: 18 to 35 percent
Total clay content: 20 to 45 percent
Sand content coarser than very fine sand: less than 15 percent
Calcium carbonate equivalent: 15 to 40 percent
CEC/clay ratio: more than 0.6

A Horizon
Hue: 7.5YR or 10YR
Value: 4 to 6
Chroma: 2 to 4
Texture: loam, clay loam, silt loam, silty clay loam
Total clay content: 15 to 27 percent
Carbonate clay content: 0 to 5 percent
Calcium carbonate equivalent: 5 to 25 percent
Electrical conductivity (mmhos/cm): 0 to 2
Sodium Adsorption Ratio: 0
Effervescence: very slight to slight
Reaction (pH): moderately alkaline (7.9 to 8.4)

Bw Horizon
Hue: 7.5YR to 10YR
Value: 5 to 7
Chroma: 2 to 4
Texture: clay loam, silt loam, silty clay loam, clay, silty clay
Total clay content: 20 to 45 percent
Carbonate clay content: 5 to 15 percent
Identifiable secondary carbonate: 0 to 5 percent fine films, threads, and concentrations
Calcium carbonate equivalent: 15 to 40 percent
Electrical conductivity (mmhos/cm): 0 to 2
Sodium Adsorption Ratio: 0 to 1
Effervescence: slight to strong
Reaction (pH): slightly alkaline to moderately alkaline (7.4 to 8.4)

Bk Horizon
Hue: 5YR to 10YR
Value: 6 to 8
Chroma: 2 to 6
Texture: clay loam, silt loam, silty clay loam, silty clay
Total clay content: 25 to 45 percent
Carbonate clay content: 15 to 25 percent
Identifiable secondary carbonate: 15 to 50 percent fine masses and concretions
Calcium carbonate equivalent: 20 to 50 percent
Electrical conductivity (mmhos/cm): 0 to 4
Sodium Adsorption Ratio: 2 to 15
Effervescence: strong to violent
Reaction (pH): slightly alkaline to moderately alkaline (7.4 to 8.4)
Note: Where this horizon is at or near the minimum depth of 51 cm, the upperpart is intermittently, weakly to strongly cemented.

COMPETING SERIES:
These are the Conchas, Hoban, Poquita, and Stovall series in the same family. Similar soils are the Angelo, Hodgins, Midessa, Ratliff, Reakor, and Seferino series.
Conchas soils: have a lithic contact between 51 and 102 cm
Hoban soils: have accumulations of gypsum in the lower part of the calcic horizon
Poquita soils: have hue of 2.5YR or 5YR in the particle-size control section and solum thickness less than 152 cm
Stovall soils: have calcic horizons within 15 to 38 cm of the surface
Angelo soils: have an ustic soil moisture regime and have a mollic epipedon
Hodgins soils: do not have a calcic horizon within 102 cm of the surface
Midessa and Ratliff soils: have a fine-loamy particle-size control section
Reakor soils: are dry in the soil moisture control section for longer periods
Seferino soils: have carbonatic mineralogy

GEOGRAPHIC SETTING:
Parent material: calcareous loamy alluvium and/or eolian deposits derived from limestone
Landscape: dissected plateaus
Landform: toeslopes of ridges, alluvial flats, and alluvial fans
Slope: mostly 0 to 1 percent, but ranges up to 3 percent
Mean annual precipitation: 330 to 483 mm (13 to 19 in)
Thornthwaite P-E Index: 14 to 26
Mean annual air temperature: 16.7 to 20.0 degrees C (62 to 68 degrees F)
Frost-free period: 210 to 240 days
Elevation: 457.2 to 1219.2 m (1,500 to 4,000 ft)

GEOGRAPHICALLY ASSOCIATED SOILS:
These are the Tobosa, Iraan, and Lozier series.
Tobosa soils: have vertic features and occur higher on ridges
Iraan soils: are very deep mollisols and occur lower on floodplains
Lozier soils: are loamy-skeletal and occur higher on hillslopes

DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderate. Runoff is negligible on slopes less than 1 percent, and low on 1 to 3 percent slopes.

USE AND VEGETATION: Mainly used for rangeland. Some areas are irrigated and used for growing cotton and sorghum. Native vegetation was short and midgrasses. Range now consists dominantly of burrograss and an overstory of tarbush and scrub mesquite trees.

DISTRIBUTION AND EXTENT: Western and southwestern Texas (MLRA 81A). The series is of large extent.

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

SERIES ESTABLISHED: Reagan County, Texas (Reconnaissance Soil Survey of West Central Texas); 1922.

REMARKS:
Edited 09/2016 (RFG-THW): 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:
Ochric epipedon - 0 to 20 cm(0 to 8 in). (A1 and A2 horizons)
Cambic horizon - 20 to 76 cm (8 to 30 in). (Bw1 and Bw2 horizons)
Calcic horizon -76 to 203 cm (30 to 80 in). (Bk1, Bk2, and Bk3 horizons)
Ustic feature -The soil has an aridic moisture regime that borders on the ustic regime.

ADDITIONAL DATA: Beltsville Laboratory Data available for 3 pedons; samples No. 16492-16500.

Taxonomic Version: Keys to Soil Taxonomy, 12th Edition, 2014.

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National Cooperative Soil Survey
U.S.A.