LOCATION DEWEYVILLE TXEstablished Series
TYPICAL PEDON: Deweyville mucky silt loam, in forest. (Colors are for moist soil unless otherwise
stated.)
A1--O to 4 inches; very dark grayish brown (10YR 3/2) broken face, mucky silt loam, very dark grayish brown (10YR 3/2) rubbed, massive; very friable, slightly sticky and nonplastic; many medium and large roots; 78 percent mineral material; about 20 percent fiber unrubbed, 8 percent fiber rubbed; fibers are 1 to 10 mm in size; extremely acid; (pH 3.8 in 0.01 M calcium chloride) gradual smooth boundary. (0 to 10 inches thick)
Oe--4 to 36 inches; dark brown (7.5YR 3/2) broken face, hemic material, dark brown (7.5YR 3/2) rubbed, about 52 percent fiber unrubbed, 24 percent fiber rubbed; fibers are 1 mm to 5 cm in size; massive; common medium and large roots; about 40 percent mineral material; extremely acid; (pH 4.0 in 0.01 M calcium chloride) diffuse smooth boundary. (10 to 50 inches thick)
Oa--36 to 70 inches; dark brown (7.5YR 3/2) broken face, sapric material, dark brown (7.5YR 3/2) rubbed, about 20 percent fiber unrubbed, 5 percent rubbed; fibers are 1 mm to 5 cm in size; massive; estimated 30 percent mineral material; extremely acid. (pH 4.0 in 0.01 M calcium chloride)
TYPE LOCATION: Newton County, Texas; from the intersection of Farm Road 82 and Texas Highway 87 (which is about 5.5 miles east of Kirbyville, Texas), 4.0 miles south on Texas Highway 87, 2.0 miles southeast on Farm Road 2829, 2.6 miles south on county road, 0.9 miles northeast along forest road, 150 feet north in forest, site is about 2,500 feet west of Sabine River.
RANGE IN CHARACTERISTICS: Thickness of the organic material ranges from 51 inches to more than 80 inches; pH ranges from 3.7 to 4.5 in O.O1M calcium carbonate in all horizons.
The A horizon hue of 7.5YR, 1OYR, or N/, value of 2 or 3, and chroma of less than 3. It is mucky silt loam, mucky silty clay loam or mucky clay loam. The fiber content averages about 15 to 30 percent and 5 to 20 percent rubbed. In some pedons the surface layer is organic. Mineral content ranges from 50 to 80 percent, and is mostly silt and clay.
The Oe horizon has hue of 5YR through 10YR, values of 2 or 3 and chromas of 1 through 3. The fiber content in the Oe averages about 40 to 70 percent and 16 to 35 percent rubbed. Mineral content ranges from 25 to 50 percent. Fiber size ranges mostly from 1 mm to 8 cm, but includes decayed logs up to 20 cm in diameter.
The Oa horizon has colors similar to the Oe. Fiber content ranges from 20 to 30 percent unrubbed and 5 to 16 percent rubbed. The Oa horizon is lacking in some pedons.
COMPETING SERIES: These are the Dasher series in the same family and the Dare, Dorovan, Kingsland, Maurepas, and Pungo series. Dasher soils contain about 2 to 5 percent mineral material in the soil profile and have fewer decomposed logs, fragments of logs, and woody plant roots in the profile. Dare, Dorovan, Maurepas, and Pungo soils are dominated by sapric material within the control section, in addition, Maurepas soils are less acid.
GEOGRAPHIC SETTING: Deweyville soils are in flood plains of tributaries and major streams in remnant ox bows that flood frequently or on level depressional swamps or poorly defined drainageways that flood frequently. Slopes are less than 1 percent. These soils formed in under very poorly drained conditions from the remains of swamp vegetation dominated by swamp tupelo, water tupelo, blackgum, cypress, and related fibrous hydrophytic plants. Mean annual precipitation ranges from 46 to 54 inches. Mean annual temperature ranges from 65 degrees to 70 degrees F., and the Thornthwaite annual P-E indices exceed 64.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Mantachie, Bleakwood, Urbo, and Iuka series. These are mineral soils and are slightly higher in the flood plain.
DRAINAGE AND PERMEABILITY: Deweyville soils are very poorly drained; runoff is very slow, permeability is moderately rapid. Deweyville soils are ponded saturated by fresh water at or near the surface throughout the year.
USE AND VEGETATION: Most of the areas are undeveloped and used for wildlife habitat. Vegetation consists of mixed hardwood forests with the dominant trees being swamp tupelo, water tupelo, blackgum, baldcypress, sweetbay, and other hydrophytic species.
DISTRIBUTION AND EXTENT: Lower coastal plains of East Texas, Louisiana and possibly other states. The series is of minor extent.
MLRA OFFICE RESPONSIBLE: Little Rock, Arkansas
SERIES ESTABLISHED: Newton County, Texas; 1980.
REMARKS: National Soil Survey Laboratory S77TX-351-4 (77T 7727 & 77T 7728).
Lincoln Lab determined pH of A horizon in 0.01m calcium chloride to be 4.0. The pH of Oe horizon in 0.01m calcium chloride is 3.7.
Field Determination of pH by glass electrode of
A horizon in 0.01m calcium chloride is 3.8. The pH of the Oe horizon in 0.01m calcium chloride is 4.0. The pH of the Oe horizon in 0.01m calcium chloride is 4.0.
Field determination of pH by Hellige-Truog of A horizon is 4.8, Oe horizon is 4.8 and Oe horizon is 4.8.