LOCATION WOODSBORO TXEstablished Series
TAXONOMIC CLASS: Fine, smectitic, hyperthermic Vertic Natraqualfs
TYPICAL PEDON: Woodsboro loam, -- on a southeast facing, concave, 0.2 percent slope in rangeland at an elevation of 23 m (90 ft). (Colors are for moist soil unless otherwise stated.)
A--0 to 15 cm (0 to 6 in); dark grayish brown (10YR 4/2) loam, grayish brown (10YR 5/2), dry; moderate fine and medium subangular blocky structure parting to weak fine granular; firm, hard, slightly sticky, slightly plastic; many very fine and common fine roots; common fine tubular pores; 1 percent faint light gray (10YR 7/2) sand coats on all faces of peds; 5 percent fine distinct dark yellowish brown (10YR 4/6) masses of oxidized iron with clear boundaries lining pores; EC is 1.2; SAR is 13; neutral; clear smooth boundary. [8 to 23 cm (3 to 9 in) thick]
Btng1--15 to 51 cm (6 to 20 in); dark grayish brown (10YR 4/2) clay, grayish brown (10YR 5/2), dry; moderate medium and coarse angular blocky structure parting to moderate fine and medium angular blocky; very firm, very hard, very sticky, very plastic; common fine roots and many very fine roots; common fine tubular pores; 1 percent distinct light gray (10YR 7/2) sand coats on vertical faces of peds; 10 percent distinct very dark gray (10YR 3/1) organic stains on all faces of peds; 10 percent distinct pressure faces; 20 percent distinct clay films on vertical faces of peds; 2 percent fine distinct yellowish brown (10YR 5/6) masses of oxidized iron with clear boundaries in matrix; EC is 2.8; SAR is 23; very slightly effervescent; moderately alkaline; gradual wavy boundary.
Btng2--51 to 66 cm (20 to 26 in); gray (10YR 5/1) clay, gray (10YR 6/1), dry; strong medium and coarse angular blocky structure parting to moderate fine and medium angular blocky; very firm, very hard, very sticky, very plastic; common fine roots and many very fine roots; common fine tubular pores; 3 percent distinct light gray (10YR 7/2) sand coats on vertical faces of peds; 3 percent distinct very dark brown (10YR 2/2) organic stains on all faces of peds; 5 percent prominent pressure faces on vertical faces of peds; 20 percent distinct clay films on vertical faces of peds; 1 percent fine prominent dark yellowish brown (10YR 4/6) masses of oxidized iron with diffuse boundaries lining pores; 2 percent fine distinct light yellowish brown (10YR 6/4) masses of oxidized iron with clear boundaries in matrix; 5 percent fine and medium prominent yellowish brown (10YR 5/6) masses of oxidized iron with clear boundaries in matrix; EC is 5.0; SAR is 36; very slightly effervescent; moderately alkaline; gradual wavy boundary.
Btng3--66 to 81 cm (26 to 32 in); gray (10YR 6/1) sandy clay, light gray (10YR 7/1), dry; strong medium and coarse angular blocky structure parting to moderate fine and medium angular blocky; very firm, very hard, very sticky, very plastic; many very fine roots; common fine tubular pores; 2 percent prominent light gray (10YR 7/2) sand coats on vertical faces of peds; 10 percent prominent pressure faces on vertical faces of peds; 15 percent distinct clay films on vertical faces of peds; 1 percent fine distinct spherical black (10YR 2/1) masses of manganese with sharp boundaries in matrix; 2 percent fine and medium prominent strong brown (7.5YR 5/6) masses of oxidized iron with clear boundaries in matrix; 2 percent fine prominent dark yellowish brown (10YR 4/6) masses of oxidized iron with sharp boundaries lining pores; 5 percent fine and medium distinct light yellowish brown (10YR 6/4) masses of oxidized iron with clear boundaries in matrix; 10 percent fine and medium prominent yellowish brown (10YR 5/6) masses of oxidized iron with clear boundaries in matrix; EC is 8.0; SAR is 53; very slightly effervescent; moderately alkaline; gradual wavy boundary. [combined thickness of the Btn horizons is 43 to 155 cm (17 to 61 in)]
Btkn1--81 to 97 cm (32 to 38 in); grayish brown (2.5Y 5/2) clay loam, light brownish gray (2.5Y 6/2), dry; moderate medium and coarse angular blocky structure; very firm, very hard, very sticky, very plastic; many very fine roots; common fine tubular pores; 5 percent distinct clay films on vertical faces of peds; 5 percent distinct grayish brown (10YR 5/2) organic stains on all faces of peds; 5 percent fine and medium nodules of calcium carbonate; 7 percent fine to coarse masses of calcium carbonate; 3 percent fine distinct spherical black (10YR 2/1) masses of manganese with sharp boundaries in matrix; 2 percent fine and medium distinct dark yellowish brown (10YR 4/4) masses of oxidized iron with clear boundaries lining pores; EC is 4.5; SAR is 18; slightly effervescent; strongly alkaline; gradual smooth boundary.
Btkn2--97 to 137 cm (38 to 54 in); light yellowish brown (2.5Y 6/3) sandy clay loam, pale yellow (2.5Y 7/3), dry; moderate fine and medium subangular blocky structure; firm, hard, moderately sticky, moderately plastic; common very fine roots; common fine tubular pores; 5 percent faint clay films on vertical faces of peds; 2 percent faint grayish brown (10YR 5/2) organic stains on all faces of peds; 4 percent fine and medium nodules of calcium carbonate; 3 percent fine to coarse masses of calcium carbonate; 1 percent fine distinct spherical black (10YR 2/1) masses of manganese with sharp boundaries in matrix; 2 percent fine and medium prominent yellowish brown (10YR 5/6) masses of oxidized iron with clear boundaries in matrix; EC is 4.8; SAR is 20; slightly effervescent; strongly alkaline; gradual smooth boundary. [combined thickness of the Btkn horizons is 38 to 114 cm (15 to 45 in)]
Btkn3--137 to 168 cm (54 to 66 in); light gray (2.5Y 7/2) sandy clay loam, pale yellow (2.5Y 8/2), dry; weak fine and medium subangular blocky structure; friable, slightly hard, slightly sticky, slightly plastic; common very fine roots; 5 percent faint clay films on vertical faces of peds 4 percent faint distinct grayish brown (10YR 5/2) organic stains on all faces of peds; 5 percent fine and medium nodules of calcium carbonate; 4 percent fine to coarse masses of calcium carbonate; 2 percent fine and medium prominent spherical very dark brown (10YR 2/2) masses of manganese with sharp boundaries in matrix; 3 percent fine and medium prominent light olive brown (2.5Y 5/6) masses of oxidized iron with clear boundaries in matrix; EC is 4.2; SAR is 23; very slightly effervescent; strongly alkaline; gradual smooth boundary.
Btkn4--168 to 203 cm (66 to 80 in); light gray (2.5Y 7/2) sandy clay loam, pale yellow (2.5Y 8/2), dry; weak fine and medium subangular blocky structure; firm, slightly hard, moderately sticky, moderately plastic; common very fine roots; 5 percent faint clay films on vertical faces of peds; 3 percent fine and medium carbonate masses; 1 percent medium nodules of calcium carbonate;1 percent fine distinct olive brown (2.5Y 4/4) masses of oxidized iron with clear boundaries lining pores; 3 percent fine and medium distinct light olive brown (2.5Y 5/4) masses of oxidized iron with clear boundaries in matrix; EC is 4.2; SAR is 22; slightly effervescent; strongly alkaline.
TYPE LOCATION: Refugio County, TX; from the intersection of U.S. Highway 77 and U.S. Highway 183 in Refugio, 11.3 miles north on U.S. Highway 77, 6.4 miles northwest on ranch road to Welder West Headquarters, 0.7 mile west on ranch road, 0.2 mile north on ranch road and about 300 feet west in rangeland. Latitude: 28 degrees, 29 minutes, 4 seconds N; Longitude: 97 degrees, 13 minutes, 12.2 seconds W. USGS Vidauri topographic quadrangle; NAD 83.
RANGE IN CHARACTERISTICS:
Soil Moisture: An aquic soil moisture regime.
Mean annual soil temperature: 22.2 to 23.4 degrees C (72 to 74 degrees F)
Depth to secondary calcium carbonate: 71 to 130 cm (28 to 51 in)
Depth to natric horizon and gleyed matrix: 8 to 23 cm (3 to 9 in)
Particle-size control section (weighted average)
Clay content: 38 to 45 percent
A horizon
Hue: 10YR
Value: 4 or 5
Chroma: 1 or 2
Texture: fine sandy loam or loam
Clay content: 15 to 22 percent
Masses of oxidized iron: amount- 2 to 4 percent, color- shades of brown
EC (dS/m): 1 to 4
SAR: 6 to 20
Reaction: neutral or slightly alkaline
Btng horizon
Hue: 10YR or 2.5Y
Value: 2 to 6
Chroma: 1 or 2
Texture: clay loam, sandy clay, or clay
Clay content: 35 to 45 percent
Masses of oxidized iron: amount- 2 to 15 percent, colors-shades of brown or yellow
Calcium carbonate equivalent: 0 to 1 percent
EC (dS/m): 2 to 10
SAR: 13 to 30
Effervescent: none or very slightly
Reaction: moderately alkaline
Btkn horizon
Hue: 10YR or 2.5Y
Value: 5 to 7
Chroma: 1 to 3
Texture: sandy clay loam or clay loam
Clay content: 25 to 35 percent
Masses of oxidized iron: amount- 2 to 25 percent, colors-shades of brown or yellow
Calcium carbonate equivalent: 2 to 15 percent
Identifiable secondary carbonate: amount-1 to 15, size-fine to coarse, kind-nodules and masses
EC (dS/m): 4 to 12
SAR: 13 to 25
Effervescent: very slightly to strongly
Reaction: moderately alkaline
COMPETING SERIES: There are no other series in the same family. Similar soils are the Livia (TX), Narta (TX), and Palacios (TX) series.
Livia and
Narta soils: do not have vertic properties.
Palacios soils: have a mollic epipedon.
GEOGRAPHIC SETTING:
Parent material: loamy fluviomarine deposits of the Pleistocene age.
Landform: drainageways on the coastal plain
Slope: 0 to 1 percent
Mean annual precipitation: 762 to 914 mm (30 to 36 in)
Mean annual air temperature: 21 to 21.5 degrees C (70 to 71 degrees F)
Precipitation pattern: The majority of rainfall occurs from May to October. The driest period is from November to April.
Frost-free period: 280 to 305 days
Elevation: 6.1 to 30.5 m (20 to 100 feet)
Thornwaite annual P-E indices: 40 to 46
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Greta,
Inari,
Vidauri, and
Wyick series.
Greta soils: have less clay in the upper subsoil layer, are somewhat poorly drained, and are on flats on the coastal plain
Inari soils: are moderately well drained, have lower salinity values, and are on old meander ridges on the coastal plain
Vidauri soils: have lower salinity values and are on flats on the coastal plain
Wyick soils: are moderately well drained, have lower salinity values, and are on flats on the coastal plain
DRAINAGE AND PERMEABILITY: Poorly drained. Permeability is very slow. Runoff is negligible. These soils are rarely flooded for very brief periods after high rainfall events and are saturated with reducing conditions from the soil surface to 81 cm (0 to 32 in) during the months of September through and from April to June.
USE AND VEGETATION: Used mostly livestock grazing and wildlife habitat; typical vegetation include salt tolerant species. Salty Prairie PE 31-44 (R150AY540TX)
DISTRIBUTION AND EXTENT: Gulf Coast Prairies (MLRA 150A on LRR T) on the coastal plain of Texas from the tributaries of the San Antonio River to the Mission River; small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Refugio County, Texas, 2009. The name is from a community in Refugio County
REMARKS: These soils were originally included in the Narta series. The Narta soils are located at elevations less than 6 m (20 ft) above sea level along the Texas Gulf Coast in MLRA 150B and are subject to flooding due to storm surge during tropical disturbances.
Diagnostic horizons and features recognized in this pedon are:
Particle size control section: 15 to 65 cm (6 to 26 in). (Btn1 and Btn2 horizons)
Ochric epipedon: 0 to 15 cm (0 to 6 in). (A horizons)
Natric horizon: 15 to 203 cm (6 to 80 in. (Btng1, Btng2, Btng3, Btkn1, Btkn2, Btkn3, Btkn4 horizons)
Vertic features: Linear extensibility is greater than 6 from 15 to 81 cm (6 to 32 in). (Btn1, Btn2, and Btn3 horizons)
Episaturation: The zone of saturation from 0 to 81 cms (0 to 32 in. (A, Btn1, Btn2, Btn3 horizons)
Aquic conditions: 0 to 81 cm (0 to 32 in) during the spring and fall months of the year.
Gleyed feature: 15 to 81 cm (6 to 32 in) (Btng1, Btng2, Btng3
ADDITIONAL DATA: Laboratory data exists from the series type location by the MLRA 150 Soil Survey Office.
TAXONOMIC VERSION: Keys to Soil Taxonomy, Tenth Edition, 2006