LOCATION WOCKLEY                 TX

Established Series
FFW-LCB-KBH
09/2016

WOCKLEY SERIES

The Wockley series consists of very deep, somewhat poorly drained, moderately slow permeable soils. These nearly level soils formed in loamy sediments from the Willis Formation of late Pliocene age. Slope ranges from 0 to 3 percent but is dominantly from 0.1 to 0.5 percent. Mean annual temperature is about 20 degrees C (68 degrees F), and mean annual precipitation is about 1143 mm (45 in).

TAXONOMIC CLASS: Fine-loamy, siliceous, semiactive, hyperthermic Plinthaquic Paleudalfs

TYPICAL PEDON: Wockley fine sandy loam--pasture. (Colors are for moist soil unless otherwise stated.)

Ap--0 to 18 cm (0 to 7 in); dark grayish brown (10YR 4/2) fine sandy loam, grayish brown (10YR 5/2) dry; weak fine granular structure; slightly hard, friable; common fine roots; common fine pores; 1 percent crayfish krotovinas; 1 percent fine faint strong brown (7.5YR 4/6) iron concentrations with sharp boundaries lining roots and pores; strongly acid; clear wavy boundary. (Thickness is 10 to 56 cm [4 to 22 in].)

E--18 to 56 cm (7 to 22 in); brown (10YR 5/3) fine sandy loam, pale brown (10YR 6/3) dry; weak fine subangular blocky structure parting to weak fine granular; slightly hard, friable; few fine roots; common fine pores; 1 percent crayfish krotovinas; 2 percent fine distinct strong brown (7.5YR 4/6) iron concentrations with clear boundaries lining roots and pores; 1 percent fine faint light brownish gray (10YR 6/2) iron depletions with sharp boundaries adjacent to iron concentrations in matrix; 2 percent ironstone nodules generally less than 5 mm in diameter; moderately acid; gradual wavy boundary. (Thickness is 19 to 65 cm [8 to 26 in].)

Btc--56 to 84 cm (22 to 33 in); brown (10YR 5/3) sandy clay loam, very pale brown (10YR 7/3) dry; weak coarse prismatic structure parting to weak fine and medium subangular blocky; hard, firm; few very fine roots; few very fine pores; few faint clay films; 1 percent crayfish krotovinas; 5 percent fine and medium distinct yellowish brown (10YR 5/6) iron concentrations with diffuse boundaries on surfaces of peds; 3 percent fine and medium prominent red (2.5YR 4/8) iron concentrations with sharp boundaries in matrix; 4 percent fine and medium faint light brownish gray (10YR 6/2) iron depletions with sharp boundaries adjacent to iron concentrations in matrix; 5 ironstone nodules generally less than 1 cm in diameter; 6 percent medium red (2.5YR 4/8) plinthite in centers of red (2.5YR 4/8) iron concentrations; strongly acid; gradual wavy boundary. (Thickness is 20 to 117 cm [8 to 46 in].)

Btcv1--84 to 147 cm (33 to 58 in); light brownish gray (10YR 6/2) sandy clay loam, light gray (10YR 7/2) dry; weak coarse prismatic structure parting to moderate medium subangular blocky; very hard, firm; few very fine pores in yellowish brown (10YR 5/6) iron concentrations; common distinct clay films on surfaces of peds; 1 percent crayfish krotovinas; 25 percent medium and coarse distinct yellowish brown (10YR 5/6) iron concentrations with clear boundaries on surfaces in matrix; 12 percent medium and coarse red (2.5YR 4/8) iron concentrations with sharp boundaries in matrix; 8 percent ironstone nodules generally less than 1 cm in diameter; 8 percent medium red (2.5YR 4/8) plinthite nodules in centers of red (2.5YR 4/8) iron concentrations; moderately acid; gradual wavy boundary.

Btcv2--147 to 203 cm (58 to 80 in); light brownish gray (10YR 6/2) sandy clay loam, light gray (10YR 7/2) dry; weak coarse prismatic structure parting to moderate medium subangular blocky; very hard, firm; common distinct clay films on surfaces of peds; 2 percent crayfish krotovinas; 15 percent medium and coarse distinct yellowish brown (10YR 5/6) iron concentrations with clear boundaries on surfaces in matrix; 25 percent medium and coarse red (2.5YR 4/8) iron concentrations with sharp boundaries in matrix; 8 percent iron oxide concretions generally less than 1 cm in diameter; 5 percent medium red (2.5YR 4/8) plinthite nodules in centers of red (2.5YR 4/8) iron concentrations; 10 percent gray (10YR 6/1) albic material increasing with depth; slightly acid. (Combined thickness of Btcv horizons is 15 to 96 cm [6 to 38 in].)

TYPE LOCATION: Harris County, Texas; from the intersection of U.S. Highway 290 and Hegar Road in Hockley; 2.2 miles southeast on U.S. Highway 290 to Bauer Road; 1.0 mile north on Bauer Road; 30 ft west in cropland. Latitude: 30 degrees, 01 minutes, 04 seconds North; Longitude: 95 degrees, 46 minutes, 55 seconds West. USGS topographic quadrangle: Hockley, Texas; NAD83; UTM 15.

RANGE IN CHARACTERISTICS: Solum thickness is more than 203 cm (80 in.)

Soil Moisture: udic soil moisture regime. The soil moisture control section, 10 to 30 cm (4 to 12 in), is typically moist from September to July in normal years. The cumulative total number of days the soil moisture control section is dry is less than 90 days.

Mean annual soil temperature: 21.7 to 22.2 (71 to 72 degrees F)
Depth to albic materials: 122 to 152 cm (48 to 60 in)
Depth to argillic horizon: 45 to 75 cm (18 to 30 in)
Depth to glossic materials: 132 to 163 cm (52 to 64 in)
Depth to iron depletions: 10 to 76 cm (4 to 30 in)
Depth to plinthite: 51 to 165 cm (20 to 65 in)

Particle-size control section (weighted average)
Clay content: 20 to 32 percent
Ironstone nodules: 2 to 20 percent
CEC/clay ratio: 0.25 to 0.40

Ap or A Horizon
Hue: 10YR
Value: 3 to 5
Chroma: 2 or 3; Pedons with value of 3 and chroma of 2 or 3 are less than 25 cm (10 in) thick.
Texture: fine sandy loam or loam
Iron concentrations: amount-0 to 2, size-fine, contrast-faint, boundary-clear or sharp, location-lining roots and pores, shades-brown
Reaction: strongly acid to slightly acid

E Horizon
Hue: 10YR
Value: 5 or 6
Chroma: 3 or 4
Texture: fine sandy loam or loam
Iron concentrations: amount-2 to 5 percent, size-fine and medium, contrast-faint or distinct, boundary-diffuse to sharp, location-lining roots and pores and in matrix
Iron depletions: amount-1 to 3 percent, size-fine and medium, contrast-faint, boundary-sharp or clear, location-in matrix adjacent to iron concentrations
Ironstone nodules: 0 to 5 percent
Reaction: strongly acid to slightly acid

Btc Horizon
Hue: 7.5YR or 10YR
Value: 4 to 6
Chroma: 3 or 4
Texture: loam, sandy clay loam, clay loam
Clay content: 20 to 38 percent
Clay films: location-surfaces of peds, contrast-faint or distinct
Iron concentrations: amount-5 to 25 percent, size-fine to coarse, contrast-faint to prominent, boundary-diffuse to sharp, location-lining roots and pores, in matrix, on surfaces of peds
Iron depletions: amount-2 to 15 percent, size-fine and medium, contrast-faint or distinct, boundary-sharp or clear, location-in matrix adjacent to iron concentrations
Ironstone nodules: 3 to 15 percent
Reaction: very strongly acid to slightly acid

Btcv Horizons
Hue: 7.5YR
Value: 4 to 7
Chroma: 2 or 3
Texture: sandy clay loam, clay loam, clay
Clay content: 22 to 46 percent
Clay films: location-on surfaces of peds, contrast-faint to prominent
Iron concentrations: amount-15 to 50 percent, size-fine to coarse, contrast-faint to prominent, boundary-diffuse to sharp, location-lining roots and pores, in matrix, on surfaces of peds
Iron depletions: amount-2 to 15 percent, size-fine and medium, contrast-faint or distinct, boundary-sharp or clear, location-in matrix adjacent to iron concentrations
Ironstone nodules: 3 to 15 percent
Plinthite nodules: 2 to 12 percent
Reaction: very strongly acid to slightly acid

COMPETING SERIES: There are no series in the same family. Similar soils are the Bernaldo, Cheetham, Gallime, Hockley, Katy, Latex, and Segno series.
Bernaldo, Gallime, Latex series: Thermic temperature regime; Glossic Paleudalfs
Cheetham series: Active CEC/Clay class; loamy sand surface layer more than 50 cm (20 in) thick
Hockley series: well drained; do not have aquic conditions within 75 cm (30 in) of the surfaces
Katy series: do not have aquic conditions within 75 cm (30 in) of the surface; active CEC/Clay class
Segno series: Thermic temperature regime; do not have aquic conditions within 75 cm (30 in) of the surface

GEOGRAPHIC SETTING:
Parent material: Loamy sediments derived from the Willis Formation of late Pliocene age
Landscape: Coastal Plain Landform: Flat
Slope: 0 to 3 percent but is dominantly from 0.1 to 0.5 percent
Mean annual temperature: 19.5 to 21.1 degrees C (67 to 70 degrees F)
Mean annual precipitation: 1041 to 1245 mm (41 to 49 in)
Precipitation Pattern: Precipitation is fairly uniform throughout the year with slight peaks in the spring and fall. Summertime rainfall is controlled by the influx of tropical moisture.
Frost-free period: 240 to 300 days
Elevation: 61 to 91 m (200 to 300 ft)
Thornthwaite annual P-E indices: 52 to 72

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Gessner, Hockley, and Snakecreekseries.
Gessner series: poorly drained and in depressions
Hockley series: well drained and on a higher landscape position
Snakecreek series: poorly drained and on a lower landscape position

DRAINAGE AND PERMEABILITY: Somewhat poorly drained. Moderately slow permeability. Runoff is high on slope up to 1 percent and very high on 1 to 3 percent slope. The soil is saturated from a depth of 10 to 84 cm (4 to 33 in) for periods of 3 to 6 weeks during the winter and spring months and after heavy rainfall events in the summer and fall months. In normal years, these soils will reduce for periods of 1 or 2 weeks during the wettest period.

USE AND VEGETATION: Used mainly as cropland and pastureland. Urban encroachment is in the eastern portion of this series' extent. The dominant pasture grass is improved bermudagrass or bahiagrass. The dominant crop is corn.

DISTRIBUTION AND EXTENT: Southeast Texas; LRR T; MLRA 150A; Large extent.

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

SERIES ESTABLISHED: Harris County, Texas, 1973.

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle size control section: 56 to 107 cm (22 to 42 in) (Btc and Btcv1 horizons)
Ochric epipedon: 0 to 56 cm (0 to 22 in) (Ap and E horizons)
Argillic horizon: 56 to 203 cm (22 to 80 in) (Btc, Btcv1 and Btcv2 horizons)
Redoximorphic depletions: 18 to 203 cm (7 to 80 in) (E, Btc, Btcv1, and Btcv2 horizons)
Episaturation: The zone of saturation at 18 to 56 cm (7 to 22 in) (E horizon)
Other features:
Pale feature: Many coarse iron concentrations with hue of 2.5YR at 23 to 203 cm (58 to 80 in) (Btcv2)

Additional Comments: This series was established during the initial survey of Harris County to reflect those soils included in the Hockley series but phased on drainage class. The series was revised in January 2001 as part of the MLRA 150A update.

The assignment of the cation-exchange activity class is supported by laboratory data number S88TX-201-001 from Harris County, Texas.

ADDITIONAL DATA: Laboratory data available from the National Soil Survey Laboratory at Lincoln, Nebraska on sample (S88TX-201-001) from a representative pedon in Harris County, Texas.

Taxonomic Version: Soil Taxonomy, Twelfth Edition, 2014.

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National Cooperative Soil Survey
U.S.A.