LOCATION ADDICKS                 TX

Established Series
FFW-KBH-AKS
07/2019

ADDICKS SERIES

The Addicks series consists of deep, moderately well drained, moderately permeable soils that formed in thick loamy sediments. These nearly level to very gently sloping soils are on flats on coastal plains. Mean annual air temperature is about 21 degrees C (69 degrees F) and mean annual precipitation is about 1169 mm (46 in). Slopes range from 0 to 1 percent.

TAXONOMIC CLASS: Coarse-loamy, siliceous, superactive, hyperthermic Oxyaquic Argiudolls

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

Ap--0 to 28 cm (0 to 11 in); black (10YR 2/1) loam, very dark gray (10YR 3/1) dry; weak fine subangular blocky structure; hard, friable; many fine roots; many fine pores; common worm casts; neutral; gradual wavy boundary. (25 to 46 cm [10 to 18 in] thick)

Bt--28 to 58 cm (11 to 23 in); dark gray (10YR 4/1) loam, gray (10YR 5/1) dry; weak fine and medium subangular blocky structure; hard, friable; common fine roots; common fine pores; common worm casts of very dark gray (10YR 3/1) material; few iron-manganese concretions up to 5 mm. in diameter; few patchy clay films slightly darker than matrix; 1 percent fine prominent dark yellowish brown (10YR 4/6) masses of oxidized iron; few very fine calcium carbonate concretions in lower part of horizon; neutral; gradual wavy boundary. (15 to 48 cm [6 to 19 in] thick)

Btk1--58 to 125 cm (23 to 49 in); light gray (10YR 7/1) loam, white (10YR 8/1) dry; 30 to 40 percent of matrix is light brownish gray (10YR 6/2); weak coarse subangular blocky parting to weak fine subangular blocky structure; very hard, friable; few fine roots; common fine pores; few patchy clay films; 10 percent fine faint pale yellow (2.5Y 7/4) and 1 percent fine distinct yellow (2.5Y 7/6) masses of oxidized iron; 1 percent black (10YR 2/1) concretions; few worm casts; few crayfish krotovinas filled with dark gray (10YR 4/1) material; 20 percent by volume visible calcium carbonate in the form of soft masses and concretions less than 1 cm. in diameter; moderately alkaline; calcareous; clear wavy boundary. (38 to 76 cm [15 to 30 in] thick)

Btk2--125 to 203 cm (49 to 80 in); light gray (10YR 7/2) loam, very pale brown (10YR 8/2) dry; many fine and medium distinct mottles of yellow (2.5Y 7/6); weak very coarse prismatic parting to weak medium and coarse subangular blocky structure; very hard, firm; few clay films; 10 percent medium and coarse distinct yellowish brown (10YR 5/8) masses of oxidized iron; few black (10YR 2/1) concretions; few crayfish krotovinas filled with very dark gray (10YR 3/1) and dark gray (10YR 4/1) loamy material; prism faces coated with light brownish gray loam 2 to 15 mm. in thickness; 5 percent irregular shaped, pitted calcium carbonate concretions 1 to 6 cm. in diameter; moderately alkaline; noncalcareous.

TYPE LOCATION:
Harris County, Texas; from Interstate Highway 10 in Addicks, 3.5 miles north on Texas Highway 6, 1.85 miles east on Clay Road, 75 feet south in pasture.

USGS topographic quadrangle: Addicks, TX
Latitude: 29 degrees, 50 minutes, 10 seconds N;
Longitude: 95 degrees, 36 minutes, 40 seconds W;

Decimal Degrees
Latitude: 29.8363495
Longitude: -95.6113586
Datum: WGS84

UTM Easting: 247683.86 m
UTM Northing: 3303513.81 m
UTM Zone: 15

RANGE IN CHARACTERISTICS:
Soil Moisture: A 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: 21.7 to 22.8 degrees C (71 to 73 degrees F)
The mollic epipedon ranges from 25 to 50 cm (10 to 20 in) thick. The soil matrix becomes calcareous at a depth of 40 to 74 cm (16 to 29 in).

Particle-size control section (weighted average)
Clay content: 8 to 18 percent

A horizon
Hue: 10YR
Value: 2 or 3
Chroma: 1 or 2
Texture: loam, very fine sandy loam, or silt loam
Clay content: 8 to 15 percent
Reaction (pH): slightly acid to moderately alkaline (pH 6.1 to 8.4)

Bt horizon
Hue: 10YR or 2.5 Y
Value: 4 to 7
Chroma: 1 or 2
Texture loam, or silt loam
Clay content: 8 to 18 percent
Reaction (pH): neutral to moderately alkaline (pH 6.6 to 8.4)
Iron accumulations: amount- 0 to 15 percent, color-shades of brown

Btk horizon
Hue: 10YR or 2.5 Y
Value: 4 to 7
Chroma: 1 or 2
Texture loam, silt loam, silty clay loam, or clay loam
Clay content: 8 to 27 percent
Reaction (pH): neutral to moderately alkaline (pH 6.6 to 8.4
Iron accumulations: amount- 0 to 15 percent, color-shades of brown
Calcium carbonate equivalent: amount- 15 to 40 percent that occurs in the form of soft masses and few to common concretions with pitted surfaces.

COMPETING SERIES:
There are no competing series in the same family. Similar soils are the Algoa, Bernard, Clodine, Jeanerette, Morey, and Stono series.
Algoa soils: have more than 18 percent clay in the particle size control section and lack argillic horizons Bernard soils: contain more than 35 percent clay in the particle size control section
Clodine soils: lack mollic epipedons
Jeanerette and Morey soils: have fine-silty particle size control sections and have less than 15 percent calcium carbonate equivalent in the Bt horizon
Stono soils: lack carbonates in the Bt horizon and have more than 18 percent clay in the particle size control section

GEOGRAPHIC SETTING:
Parent material: loamy fluviomarine deposits derived from igneous, metatmorphic and sedimentary rock
Landscape: coastal plains
Landform: flats
Slope: 0 to 1 percent
Mean annual precipitation 1016 to 1321 mm (40 to 52 in)
Thornthwaite annual P-E indices: 62 to 82
Mean annual air temperature range: 20 to 21.1 degrees C (68 to 70 degrees F)
Frost-free period: 270 to 305 days
Elevation: 3.7 to 46 m (12 to 150 ft)

GEOGRAPHICALLY ASSOCIATED SOILS:
These are the Bernard, Clodine , Aris, Gessner, and Midland soils.
Aris soils: contain more than 35 percent clay in the particle size control section
Gessner soils: contain Ochric epipedons, 18 to 35 percent clay in particle size control section, and lack calcic horizons
Midland soils: contain more than 35 percent clay in the particle size control section and lack a Mollic epipedon

DRAINAGE AND PERMEABILITY:
Drainage class: Moderately well drained
Permeability class: moderate
Runoff: negligible
Water table is at 30.5 to 76 cm (12 to 30 in) below the surface for 1 to 2 months during most years.

USE AND VEGETATION:
Used mainly for pasture and growing rice. Native grasses are species of Andropogons, Paspalums, and Panicums. A few pine and hardwood trees have encroached on some areas.

DISTRIBUTION AND EXTENT:
General area: Gulf Coast Prairies of southeast Texas
Land Resource Region: T (Atlantic and Gulf Coast Lowland Forest and Crop Region)
Major Land Resource Area: 150A- Gulf Coast Prairies
Extent: The series is of moderate extent.

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

SERIES ESTABLISHED: Harris County, Texas; 1973.

REMARKS: These soils were formerly included in the Clodine and Morey series. Classification was changed from argiaquolls to argiudolls based on new taxonomic criteria and is no longer classified as a hydric soil.

Diagnostic horizons and features recognized in this pedon are:

Particle size control section: 28 to 79 cm (11 to 31 in). (Bt and Btk1 horizon)

Mollic epipedon -0 to 28 cm (0 to 11 in). (A horizon)

Argillic horizon - 28 to 203 cm (11 to 80 in). (Bt and Btk horizons)

Calcic horizon - 58 to 125 cm (23 to 49 in). (Btk horizons)

ADDITIONAL DATA: NSSL Data on type - S72TX101-5 (72L273-72L276) and thin sections on file in the Soil Survey Laboratory support an argillic horizon. Data from nearby similar landscape published in TAMU thesis: Distribution and Genesis of Calcic Horizons in some soils of the Texas Coast Prairies by Terrence M. Sobecki does not support an argillic horizon.

Taxonomic Version: Keys to Soil Taxonomy, Twelfth Edition, 2014.

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National Cooperative Soil Survey
U.S.A.