LOCATION DOSSMAN LA
Established Series
Rev. BAT:WLC
05/2018
DOSSMAN SERIES
The Dossman series consists of deep well drained moderately slowly permeable soils that formed in pre-Peoria age loess. Slope gradients range from 1 to 30 percent.
TAXONOMIC CLASS: Fine-silty, mixed, active, thermic Ultic Hapludalfs
TYPICAL PEDON: Dossman silt loam.
(Colors are for moist soil unless otherwise stated.)
Ap--0 to 5 inches; dark brown (7.5YR 4/4) silt loam; common fine prominent red Bt bodies; weak fine granular structure; very friable; many fine roots; few fine soft black bodies; medium acid; clear wavy boundary. (3 to 6 inches thick)
AB--5 to 9 inches; yellowish brown (10YR 5/6) silt loam; common fine red Bt bodies; weak fine subangular blocky structure; friable; common fine roots; many fine pores; common wormcasts; few fine soft brown bodies; medium acid; abrupt wavy boundary. (2 to 8 inches thick)
Bt1--9 to 16 inches; dark red (2.5YR 3/6) silty clay loam; moderate strong subangular blocky structure; firm; few fine roots; few fine pores; thick continuous dark reddish brown (2.5YR 3/4) clay films on faces of peds; few fine soft black bodies; very strongly acid; gradual wavy boundary. (5 to 14 inches thick)
Bt2--16 to 32 inches; red (2.5YR 4/6) silty clay loam; moderate strong subangular blocky structure; firm; few fine roots; many fine pores; thick continuous dark red (2.5YR 3/6) clay films; common medium black stains on surfaces of peds; very strongly acid; gradual wavy boundary. (10 to 20 inches thick)
Bt3--32 to 42 inches; reddish brown (5YR 4/4) silty clay loam; moderate medium subangular blocky structure; friable; common fine pores; thick continuous dark red (2.5YR 3/6) clay films; common medium black stains on surfaces of peds; very strongly acid; gradual wavy boundary. (6 to 12 inches thick)
Bt4--42 to 72 inches; reddish brown (5YR 4/4) silt loam; weak medium subangular blocky structure; friable; common fine pores; thin patchy clay films on surfaces of peds; silt coats are less than 1 mm thick on vertical surfaces of peds; few very fine soft black bodies; extremely acid; gradual wavy boundary. (10 to 40 inches thick)
C--72 to 106 inches; dark brown (7.5YR 4/4) silt loam; very weak coarse prismatic structure; very friable; few fine pores; few patchy silt coats along vertical cracks; few very fine brown concretions; strongly acid.
TYPE LOCATION: Evangeline Parish, Louisiana; 6 miles north of Ville Platte; 4 miles southeast of Bayou Chicot, 0.2 mile southwest of U.S. Highway 167, 36 yards east of utility pole in pasture; northeast quarter, sec. 40. T. 3 S., R. 1 E.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 50 to 100 inches. Typically less than 3 percent total sand occurs throughout the solum, but sand ranges to 10 percent. Where the loess mantle is thin the sand content in some pedons will exceed 10 percent below depths of 48 inches.
The A horizon has hue of 7.5YR or 10YR, value of 4 or 5, and chroma of 3 or 4. It is silt loam. It is strongly acid or medium acid. The AB horizon has similar characteristics except that chroma ranges from 4 through 6.
The Bt horizons have hue of 2.5YR or 5YR, value of 3 or 4, and chroma of 4 or 6. They are silty clay loam or silt loam with weighted average clay content of 30 to 35 percent. Reaction ranges from strongly acid through extremely acid.
The C horizon is brownish silt loam. Reaction is strongly acid or very strongly acid.
COMPETING SERIES: These are the Armcar,
Barnsdall,
Dexter and
Hicks series in the same family and the
Atwood,
Evangeline,
Gallion,
Lexington,
Memphis,
Rexor,
Rilla,
Silerton and
Vian series. The Armcar and Dexter soils have more than 10 percent sand in the control section. The Barnsdall soils are underlain by loamy 2C horizons. The Hicks soils are underlain by phosphatic limestone and shales. The Atwood, Evangeline, Memphis, Silerton and Vian do not have a 20 percent clay decrease within a depth of 60 inches. Gallion, Memphis and Rilla soils have a base saturation of more than 60 percent. Lexington soils have sandy loam or loam 2B horizons. Rexor soils have B horizons with hue of 10YR or 7.5YR. Silerton soils have less than 35 percent base saturation.
GEOGRAPHIC SETTING: Dossman soils are on convex slopes in dissected hill areas. Slope gradients are 1 to 30 percent. Typically the soil formed in 15 to 30 feet of oxidized and leached pre-Peoria age loess. The climate is warm and humid. The average air temperature is about 68 degrees F., and the average rainfall is about 58 inches near the type location. Thornthwaite P-E index is near 70.
GEOGRAPHICALLY ASSOCIATED SOILS: These are
Calhoun,
Duralde,
Evangeline, McKamie, and
Muskogee soils. The moderately well drained and bisequal Evangeline soils occur on gentle slopes at higher elevations. The gray and poorly drained Calhoun soils occur at higher elevations on tabular divides in association with brownish Duralde soils on pimple mounds. Muskogee and McKamie soils have clay layers in the subsoil and are at lower elevations where the loess mantle is very thin or absent.
DRAINAGE AND PERMEABILITY: Dossman soils are well drained. Runoff is medium to rapid and permeability is moderately slow. Depth to the seasonably high water table is greater than 6 feet.
USE AND VEGETATION: Most of the Dossman soils are used for woodland. Native vegetation was loblolly pine and hardwood. A small amount is cleared and used for growing sweet potatoes and pasture.
DISTRIBUTION AND EXTENT: Louisiana, and possibly Arkansas, Kentucky, Mississippi, Oklahoma, and Tennessee. The series is inextensive.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: AUBURN, ALABAMA
SERIES ESTABLISHED: Evangeline Parish, Louisiana; 1970.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - Ap and AB horizons.
Argillic horizon - Bt1, Bt2, Bt3, and Bt4 horizons.
National Cooperative Soil Survey
U. S. A.