LOCATION WOCKLEY            TX

WOCKLEY SERIES

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 7 inches; 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. (4 to 12 inches thick)

E--7 to 22 inches; 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. (8 to 20 inches thick)

Btc--22 to 33 inches; 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. (8 to 22 inches thick)

Btcv1--33 to 58 inches; 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--58 to 80 inches; 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.

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 feet west in cropland. Latitude: 30 degrees, 01 minutes, 04 seconds North; Longitude: 95 degrees, 46 minutes, 55 seconds West. Hockley, Texas USGS topographic quadrangle.

RANGE IN CHARACTERISTICS: Solum thickness is more than 80 inches.

Soil Moisture: An udic soil moisture regime. The soil moisture control section, 4 to 12 inches, 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: 69 to 72 degrees F.
Depth to albic materials: 48 to 60 inches
Depth to argillic horizon: 18 to 28 inches
Depth to glossic materials: 52 to 64 inches
Depth to iron depletions: 13 to 30 inches
Depth to plinthite: 30 to 65 inches

Particle-size control section (weighted average)
Clay content: 20 to 30 percent
Ironstone nodules: 2 to 10 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 10 inches 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 30 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, sandy clay
Clay content: 22 to 38 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: 5 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 Prairieview series.
Bernaldo,Gallime, Latex series: Thermic temperature regime; Glossic Paleudalfs
Cheetham series: Active CEC/Clay class; ls surface layer more than 20 inches thick
Hockley series: Plinthic Paleudalfs
Katy series: Aquic Paleudalfs; active CEC/Clay class
Prairieview series: Oxyaquic Paleudalfs

GEOGRAPHIC SETTING:
Parent material: Loamy sediments derived from the Willis Formation of late Pliocene age
Landform: Coastal Plain; Wockley soils occupy broad nearly level, slightly concave areas in the coastal prairie.
Slope: 0 to 1 percent
Mean annual temperature: 67 to 69 degrees F.
Mean annual precipitation: 40 to 48 inches
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 270 days
Elevation: 195 to 275 feet
Thornthwaite annual P-E indices: 52 to 72

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

DRAINAGE AND PERMEABILITY: Somewhat poorly drained. Moderately slow permeability. Runoff is low. The soil is saturated from a depth of 7 to 33 inches 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 OFFICE RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Harris County, Texas, 1973.

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle size control section: 22 to 42 inches. (Btc and Btcv1 horizons)
Ochric epipedon: 0 to 22 inches. (Ap and E horizons)
Argillic horizon: 22 to 80 inches. (Btc, Btcv1 and Btcv2 horizons)
Redoximorphic depletions: 7 to 80 inches. (E, Btc, Btcv1, and Btcv2 horizons)
Endosaturation: The zone of saturation at 58 to 80 inches. (Btcv2 horizon)
Episaturation: The zone of saturation at 7 to 22 inches. (E horizon)
Other features:
Pale feature: Many coarse iron concentrations with hue of 2.5YR at 58 to 80 inches. (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, Second Edition, 1999