LOCATION HEBBRONVILLE TXEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, hyperthermic Aridic Haplustalfs
TYPICAL PEDON: Hebbronville loamy fine sand, on a south facing, convex, 1 percent slope in rangeland; elevation is 206 m (675 ft). (Colors are for dry soil unless otherwise stated.)
A1--0 to 8 cm (0 to 3 in); pale brown (10YR 6/3) loamy fine sand, brown (10YR 4/3) moist; weak very fine subangular blocky structure; soft, very friable; many roots; many fine pores; neutral, clear smooth boundary.
A2--8 to 38 cm (3 to 15 in); brown (10YR 5/3) loamy fine sand, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; soft, very friable; many roots; many fine pores; neutral; gradual wavy boundary. (combined thickness of the A horizon is 25 to 38 cm [10 to 15 in] thick)
Bt--38 to 97 cm (15 to 38 in); brown (10YR 5/3) fine sandy loam, brown (10YR 4/3) moist; weak fine subangular blocky structure; soft, very friable; patchy clay films on faces of peds and in pores; few roots; many fine pores; 1 percent threads and films of calcium carbonate in lower part; slightly alkaline; diffuse wavy boundary. (46 to 69 cm [18 to 27 in] thick)
Btk--97 to 152 cm (38 to 60 in); light yellowish brown (10YR 6/4) fine sandy loam, dark yellowish brown (10YR 4/4) moist; structureless; soft, friable; 2 percent masses of calcium carbonate; calcareous; moderately alkaline; gradual wavy boundary. (36 to 76 cm [4 to 30 in] thick)
Bk--152 to 203 cm (60 to 80 in); very pale brown (10YR 7/4) fine sandy loam, yellowish brown (10YR 5/4) moist; structureless; slightly hard, friable; 2 percent masses of calcium carbonate; calcareous; moderately alkaline.
TYPE LOCATION: Jim Hogg County, Texas; from the intersection of Texas Highway 16 and Farm Road 649 in Randado; 4.3 miles south on Farm Road 649; 50 feet west in a rangeland. Randado, Texas USGS topographic quadrangle; Latitude: 27 degrees, 1 minute, 0 second N.; Longitude: 98 degrees, 53 minutes, 51 seconds W.; NAD 83.
RANGE IN CHARACTERISTICS:
Soil Moisture: An ustic moisture regime bordering on aridic. The soil moisture control section remains moist in some or all parts for less than 90 consecutive days in normal years. The soil is driest during the months of June through August and December through February. These soils are intermittently moist in September through November and March through May.
Mean annual soil temperature: 22 to 24 degrees C (72 to 76 degrees F)
The solum thickness is more than 203 cm (80 in).
Secondary carbonates occur at a depth of 36 to 152 cm (14 to 60 in).
A Horizon
Hue: 10YR or 7.5YR
Value: 4 to 6
Chroma: 2 or 3
Texture: loamy fine sand or fine sandy loam
Reaction: neutral or slightly alkaline
Bt Horizon and Btk Horizon
Hue: 10YR or 7.5YR
Value: 5 or 6
Chroma: 2 to 4
Texture: fine sandy loam or loam
Identifiable secondary carbonates: 1 to 3 percent masses.
Clay content: 12 to 18 percent
Reaction: neutral or slightly alkaline
Bk Horizon
Hue: 10YR
Value: 6 or 7
Chroma: 3 to 6
Texture: fine sandy loam, sandy clay loam, or loam
Identifiable secondary carbonates: 1 to 14 percent masses.
Reaction: slightly to strongly alkaline
COMPETING SERIES: There are no competing series in the same family. Similar soils are the
Brennan (TX),
Comitas (TX),
Eva (KS),
Fragua (NM),
McAllen (TX),
Spantara (NM),
Vona (CO), and
Willacy (TX) series.
Brennan and Willacy soils: have a fine-loamy particle-size control section.
Comitas soils: have sandy epipedons thicker than 51 cm (20 in).
Eva, Fragua, and Vona soils: are in a mesic soil temperature regime.
McAllen soils: do not have an argillic horizon, have a fine-loamy particle-size control section, and are calcareous throughout.
Spantara soils: are in a thermic soil temperature regime.
GEOGRAPHIC SETTING:
Parent material: eolian sands over calcareous loamy alluvium.
Landform: vegetated sand sheet
Slope: 0 to 5 percent.
Mean annual temperature: 22 to 23 degrees C (72 to 74 degrees F).
Mean annual precipitation: 508 to 711 cm (20 to 28 in.)
Frost-free period: 270 to 320 days.
Elevation: 91 to 243 m (300 to 800 ft).
Thornthwaite P-E index: 19 to 31.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the
Brennan,
Comitas,
Escobas,
McAllen,
Willacy, and
Ramadero series.
Brennan and McAllen soils: occur on similar positions.
Comitas soils: have sandy surfaces more than 51 cm (20 in) and are on higher positions.
Escobas soils: have a mollic epipedon and are on slightly lower positions.
Ramadero soils: occur in weakly expressed drainageways and have mollic epipedons thicker than 51 cm (20 in).
Willacy soils: have mollic surfaces and are on slightly lower positions.
DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderately rapid. Runoff is negligible on slopes less than one percent and very low on slopes 1 to 5 percent.
USE AND VEGETATION: Used mainly for livestock grazing and wildlife habitat, but a few areas are used for crop production. Native vegetation consists of four-flower trichloris, Arizona cottontop, Plains bristlegrass, hooded windmillgrass, pink pappusgrass and woody shrubs such as mesquite, pricklypear, Texas ebony, tasajillo, and granjeno. The ecological site is Sandy Loam, 25-35 PZ (R083EY702TX).
DISTRIBUTION AND EXTENT: Sandsheet Prairie, Texas; MLRA 83 E; LRR I. The series is of large extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas.
SERIES ESTABLISHED: Jim Hogg County, Texas; 1970.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle size control section: 38 to 89 cm (15 to 35 in) (Bt and Btk horizons).
Ochric epipedon: 0 to 38 cm (0 to 15 in) (A horizon).
Argillic horizon: 38 to 152 cm (15 to 60 in) (Bt and Btk horizons).
ADDITIONAL DATA: NSSL data from Zapata County location S01TX-505-003. Particle-size analysis was performed at the local project office for 1 pedon from Duval County. Cation Exchange activity class assigned based on data from Zapata County.
TAXONOMY VERSION: Keys to Soil Taxonomy, Tenth Edition, 2006.