LOCATION FADDIN             TX

FADDIN SERIES

TAXONOMIC CLASS: Fine, smectitic, hyperthermic Oxyaquic Vertic Argiudolls

TYPICAL PEDON: Faddin fine sandy loam, on a southeast facing, convex, 0.5 percent slope in rangeland at an elevation of 20.7 m (68 ft). (Colors are for moist soil unless stated.)

A--0 to 41 cm (0 to 16 in); very dark grayish brown (10YR 3/2) fine sandy loam, grayish brown (10YR 5/2) dry; moderate fine and very fine subangular blocky structure; slightly hard, very friable; many fine and very fine and few medium roots; common very fine pores; slightly acid; abrupt wavy boundary. (20 to 51 cm [8 to 20 in] thick)

Bt1--41 to 61 cm (16 to 24 in); very dark gray (10YR 3/1) clay, gray (10YR 5/1) dry; moderate fine angular blocky structure; extremely hard, very firm; common fine and very fine and few medium roots; few very fine pores; few faint slickensides and pressure faces; few faint clay films on faces of peds; common medium and coarse prominent red (2.5YR 4/6) and few fine and medium distinct strong brown (7.5YR 5/8) masses of oxidized iron with sharp boundaries in matrix ;slightly acid; abrupt wavy boundary. (15 to 30 cm [6 to 12 in] thick)

Bt2--61 to 89 cm (24 to 35 in); gray (10YR 6/1) clay, light gray (10YR 7/1) dry; moderate fine angular blocky structure; extremely hard, very firm; common fine and very fine roots; few faint slickensides and pressure faces; common faint clay films on faces of peds; common medium and coarse distinct yellowish brown (10YR 5/6) masses of oxidized iron with sharp boundaries in matrix; neutral; clear wavy boundary. (23 to 64 cm [9 to 25 in] thick)

Bt3--89 to 117 cm (35 to 46 in); grayish brown (10YR 5/2) sandy clay, light brownish gray (10YR 6/2) dry; moderate medium prismatic structure parting to moderate medium and coarse angular blocky; extremely hard, very firm; few fine roots; common distinct clay films along faces of prisms and patchy clay films on faces of some peds; few pitted concretions of calcium carbonate 2 to 5 mm in diameter; few fine black (10YR 2/1) iron-manganese nodules; slight effervescence; moderately alkaline; gradual wavy boundary. (20 to 51 cm [8 to 20 in] thick)

Btk--117 to 203 cm (46 to 80 in); light yellowish brown (2.5Y 6/4) clay loam, pale yellow (2.5Y 7/4) dry; weak medium and coarse angular blocky structure parting to weak fine and very fine subangular blocky; extremely hard, firm; few fine roots; common faint clay films on faces of some peds; about 30 percent by volume soft powdery masses of calcium carbonate 0.4 to 1 cm across; few pitted concretions of calcium carbonate 0.5 to 8 cm in diameter; few fine black (10YR 2/1) iron-manganese nodules; slight effervescence; moderately alkaline.

TYPE LOCATION: Victoria County, Texas; from the intersection of Loop 175 and U. S. Highway 77 southwest of Victoria, 11.3 miles south on U.S. Highway 77 to Farm Road 445, 1.9 miles east on Farm Road 445, 1.0 mile northeast and north, 0.45 mile east, and 50 feet north in rangeland. McFaddin USGS Quad; Latitude is 28 degrees, 34 minutes, 1 second N; Longitude is 96 degrees, 59 minutes, 59 seconds W. NAD 83.

RANGE IN CHARACTERISTICS: Most pedons have a few dark concretions with amounts increasing with depth.

Soil Moisture: An udic soil moisture regime. The soil moisture control section is moist in some or all parts for more than 275 days in normal years.

Mean annual soil temperature: 22 to 23.5 cm (72 to 74 degrees F).
Depth to argillic horizon: 20 to 51 cm (8 to 20 in)
Depth to secondary calcium carbonate: 71 to 102 cm (28 to 40 in)
Mollic epipedon: 41 to 76 cm (16 to 30 in) (includes the upper part of the argillic horizon in most pedons)

Particle-size control section (weighted average)
Clay content: 40 to 50 percent

A Horizon
The contact between the A and Bt horizon is abrupt and wavy causing crests and troughs; Typically, the horizon is about 41 cm (16 in) thick. It ranges from 20 to 36 cm (8 to 14 in) thick on subsoil crests and 36 to 51 cm (14 to 20 in) thick in subsoil troughs. There is a discontinuous E horizon, 1 to 3 inches thick in subsoil troughs of some pedons.
Hue: 10YR
Value: 2 or 3
Chroma: 1 or 2
Texture: fine sandy loam, very fine sandy loam or loam
Reaction: slightly acid or neutral

Bt Horizon
(upper part)
Hue: 10YR
Value: 3 to 7
Chroma: 1 or 2
Texture: sandy clay, clay loam, or clay
Clay content: 35 to 57 percent
Redox concentrations: amount-2 to 20 percent, shades-red, yellow, or brown
Identifiable secondary carbonate: amount-0 to 3 percent, kind-concretions, masses or threads
Reaction: slightly acid to neutral

Bt Horizon
(lower part)
Hue: 10YR
Value: 3 to 5
Chroma: 1 or 2
Texture: sandy clay, clay loam, or clay
Clay content: 35 to 57 percent
Redox concentrations: amount-0 to 10 percent, shades-red, yellow, or brown
Identifiable secondary carbonate: amount-0 to 3 percent, kind-concretions, masses or threads
Reaction: slightly alkaline or moderately alkaline

Btk Horizon
Hue: 7.5YR to 2.5Y
Value: 4 to 7
Chroma: 1 or 2
Texture: sandy clay loam, clay loam, or sandy clay
Clay content: 30 to 40 percent
Redox concentrations: amount-0 to 10 percent, shades-red, yellow, or brown
Redox depletions: amount-0 to 2, shades-gray
Identifiable secondary carbonate: amount-5 to 35 percent, kind-concretions, masses or threads
Reaction: slightly alkaline or moderately alkaline

COMPETING SERIES: This is the Labelle (TX) series in the same family. Similar soils are the Anahuac (TX), Dacosta (TX), Spindletop (TX), and the Texana (TX) series.
Anahuac soils: have an umbric epipedon
Dacosta soils: are not saturated for 20 or more consecutive days or 30 normal days in normal years within 100 cm (40 in) of the surface
Labelle soils: have a silt loam surface texture
Spindletop soils: have a silt loam surface texture; have a glossic horizon
Texana soils: have an albic horizon

GEOGRAPHIC SETTING:
Parent material: loamy fluviomarine deposits derived from the Beaumont Formation of Pleistocene age
Landscape: flat coastal plain
Landform: ancient meander ridges
Slope: 0 to 3 percent, but along narrow drainageways ranges to 5 percent.
Mean annual air temperature range: 22 to 24 cm (72 to 75 degrees F)
Mean annual precipitation range: 762 to 1067 mm (30 to 42 in)
Precipitation Pattern: Precipitation is uniform throughout the year with slight peaks from May to June and from September to October.
Frost-free period: 275 to 300 days
Elevation: 7.6 to 46 m (25 to 150 ft)
Thornthwaite annual P-E indices: 40 to 52

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dacosta (TX), Edna (TX), Fordtran (TX), and Laewest (TX) series.
Dacosta soils: have a sandy clay loam surface; and are on coastal plain flats
Edna and Fordtran soils: do not have a mollic epipedon; and are coastal plain dips.
Laewest soils: are clayey throughout: are on coastal plain flats

DRAINAGE AND PERMEABILITY: Moderately well drained; low runoff; very slow permeability. Water perched on top of the argillic horizon for periods of a few hours to 3 days following extended heavy rain. During wet years planting may be delayed for short periods.

USE AND VEGETATION: Used mainly for rangeland and a few areas are used for growing grain sorghum. Native vegetation included grasses such as little bluestem, indiangrass, brownseed paspalum and balsamscale. Ecological site name: Loamy Prairie 28-40" Pz; Ecological site number: R150AY535TX

DISTRIBUTION AND EXTENT: Coastal Prairie of Texas; MLRA 150A; LRR T. The series is inextensive.

MLRA OFFICE RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Victoria County, Texas; l980

REMARKS: The classification is changed from Abruptic Argiaquolls to Aquic Argiudolls based on the "Soil Moisture Study Conducted in Texas and Louisiana (ICOMAQ) 1990." This soil does not have an aquic moisture regime. These soils were formerly mapped in the Bernard or Telferner series. Data from NSSL, Sample Nos., 79PO183-187. The series was reclassified in December 2008 during the correlation of Goliad County from Aquic Argiudolls to Oxyaquic Argiudolls.

Diagnostic horizons and features recognized in this pedon are:

Mollic epipedon - the zone from the surface of the soil to a depth of approximately 61 cm (24 in). (A, Bt1 horizons)

Argillic horizons - the zone from approximately 41 to 203 cm (16 to 80 in) (Bt1, Bt2, Bt3, Btk)

ADDITIONAL DATA: NSSL data on pedon 79P0036.

TAXONOMIC VERSION: Keys to Soil Taxonomy, Tenth Edition, 2006