LOCATION BOYKIN TX+LAEstablished Series
TAXONOMIC CLASS: Loamy, siliceous, active, thermic Arenic Paleudults
TYPICAL PEDON: Boykin loamy fine sand, on 5 percent slope in forest. (Colors are for moist soil unless otherwise stated.)
A--0 to 8 inches; brown (10YR 4/3) loamy fine sand; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many fine and medium roots; few coarse roots; medium acid; clear smooth boundary. (4 to 12 inches thick)
E--8 to 24 inches; yellowish brown (10YR 5/4) loamy fine sand; single grained; loose, very friable, nonsticky and nonplastic; many fine roots; common medium roots; few krotovinas filled with brown loamy fine sand; medium acid; clear smooth boundary. (9 to 30 inches thick)
Bt1--24 to 27 inches; yellowish red (5YR 5/6) fine sandy loam; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine and medium roots; medium acid; clear smooth boundary. (0 to 6 inches thick)
Bt2--27 to 48 inches; red (2.5YR 5/6) sandy clay loam; moderate medium subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; few thin patchy clay films on faces of peds; few fine and medium roots; strongly acid; gradual smooth boundary. (10 to 30 inches thick)
Bt3--48 to 72 inches; yellowish red (5YR 5/8) sandy clay loam; few medium distinct strong brown (7.5YR 5/8) mottles; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few thin patchy clay films on faces of peds; very strongly acid, gradual smooth boundary. (20 to 40 inches thick)
BC--72 to 80 inches; reddish yellow (7.5YR 6/8) sandy clay loam; common medium distinct light gray (10YR 7/1) and few fine faint yellowish red (5YR 5/6) mottles; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few patchy clay films on faces of peds; very strongly acid.
TYPE LOCATION: Newton County, Texas; from the intersection of U. S. Highway 190 and Texas Highway 87 in Newton, 0.7 mile northeast on Texas Highway 87, 0.5 mile north on county road to fork, 0.4 mile west on county road, 150 feet north in forest.
RANGE IN CHARACTERISTICS: Solum thickness is greater than 60 inches. Clay content in the upper 20 inches of the argillic horizon ranges from 18 to 30 percent. Base saturation at 50 inches below the top of the Bt ranges from 5 to 20 percent. CEC ranges from about 10 to 20 me/100 gm.
The A horizon ranges from 20 to 40 inches thick. Reaction ranges from very strongly acid through slightly acid. The A horizon has hue of 10YR or 7.5YR, value of 4 through 5, and chroma of 2 through 4.
The E horizon has hue of 10YR or 7.5YR, value of 4 through 6, and chroma of 2 through 4.
The Bt horizons are fine sandy loam or sandy clay loam. Reaction ranges from very strongly acid through medium acid. The Bt horizons have hue of 2.5YR through 7.5YR, value of 4 through 5, and chroma of 6 through 8. Mottles range from few to common in shades of brown, red, and yellow. A few plinthite nodules occur in the lower solum of some pedons but constitutes less than 5 percent of any horizon. Some pedons have skeletans with chroma of 2 or 3 in the lower Bt horizon.
COMPETING SERIES: These are the Autryville, Bonneau, Briley, Letney, Lowndes, Lucy, Rosalie, Trep and Wagram series in the same family and the Darco, Doucette, Libert, and Shankler series. Autryville, Bonneau, Letney, and Wagram soils have hue of 7.5YR and yellower in the Bt horizon. Autryville soils also have bisequal profiles. Briley soils are developed in Eocene age materials and are assumed to have different chemistry and kinds of clays. Lowndes soils contain hard white phosphatic nodules in the profile. Lucy soils contain slightly less silt, are dry in the moisture control section for shorter periods of time, and have clays with lower CEC in the control section. Rosalie soils have skeletans of uncoated sand in the upper Bt horizons. Trep soils have hue of 10YR in the Bt horizon and have clayey lower Bt horizons. Darco and Shankler soils have sandy epipedons greater than 40 inches thick. Lilbert and Doucette soils contain contain 5 to 20 percent plinthite in the Bt horizons.
GEOGRAPHIC SETTING: Boykin soils are on broad, nearly level to moderately steep uplands of the West Coastal Plains. Slopes range from 1 to 20 percent. The soils formed in thick beds of sandy and loamy sediments of Pleistocene age, mainly of the Willis formation. Mean annual precipitation ranges from 46 to 58 inches. Summer rainfall ranges from 30 to 40 inches. Summer moisture deficit ranges from 0 to 4 inches. Mean annual temperature ranges from 66 to 70 degrees F., and the Thornthwaite annual P-E indices exceed 72.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Doucette and Shankler series and the Bonwier, Newco, Pinetucky, Rogan, Stringtown, and Urland series. Bonwier, Newco, and Stringtown soils are on convex side slopes, and steep narrow ridges. Doucette, Pinetucky, Rogan, and Urland soils are on smoother and flatter slopes usually slightly lower in the landscape. Pinetucky, Rogan, and Urland soils lack sandy epipedons 20 to 40 inches thick. Shankler soils are on associated concave positions and lower slope positions. They all lack thick sandy epipedons.
DRAINAGE AND PERMEABILITY: Boykin soils are well drained. Runoff is slow and permeability is moderate.
USE AND VEGETATION: These soils are used mainly for timber and pasture. Forest vegetation includes loblolly, shortleaf, slash, and longleaf pines, red oak, and sweetgum trees with an understory of grasses and legumes. Pastures are mainly bermuda grass and bahiagrass.
DISTRIBUTION AND EXTENT: West Coastal Plains of southeastern Texas and western Louisiana. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Jasper and Newton Counties, Texas; 1980.
REMARKS: This soil was previously included in the Briley series.
Diagnostic features and horizon for this pedon are:
Arenic epipedon - 0 to 24 inches
Argillic horizon - 24 to 80 inches
Base saturation less than 35 percent at a depth of 74 inches.
ADDITIONAL DATA: Hach kit data at type location: 72 inch depth - BS-18; CEC-11.