LOCATION BEAUREGARD LA+MSEstablished Series
TAXONOMIC CLASS: Fine-silty, siliceous, superactive, thermic Plinthaquic Paleudults
TYPICAL PEDON: Beauregard silt loam on a concave 2 percent sideslope in pasture. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 5 inches; dark grayish brown (10YR 4/2) silt loam; weak fine subangular blocky structure, parting to weak fine granular; friable; many fine and medium roots; few fine soft iron and manganese nodules; few fine pieces of charcoal; few fine pockets of very pale brown (10YR 7/3) silt in lower part; strongly acid; abrupt wavy boundary. (2 to 6 inches thick)
E--5 to 9 inches; light yellowish brown (10YR 6/4) silt loam; weak medium subangular blocky structure parting to weak fine subangular blocky; friable; many fine and medium roots; common fine and very fine continuous vesicular pores; many fine and medium iron and manganese nodules; root channels lined with strong brown (7.5YR 5/8) oxidation stains (Lepidocrocite); few fine pockets of very pale brown (10YR 7/3) silt, 1/16 to 1/4 inch in diameter; very strongly acid; clear wavy boundary. (0 to 12 inches thick)
Bt1--9 to 16 inches; light yellowish brown (10YR 6/4) silt loam; few medium distinct brownish yellow (10YR 6/8) mottles; weak coarse prismatic structure parting to weak medium subangular blocky; friable; slightly hard and brittle when dry; few fine and very fine continuous vesicular pores; few fine soft iron and manganese nodules, 1/16 to 1/8 inch in diameter; common yellowish brown (10YR 5/6) oxidation stains lining root channels; few faint discontinuous clay films on faces of peds; few pockets of light yellowish brown (10YR 6/4) silt loam "E", 1/2 to 2 inches in diameter make up about 5 percent of this horizon; common fine and medium roots in "E" pockets; common crawfish krotovinas, 1 to 3 inches wide; very strongly acid; clear wavy boundary. (Combined thickness of BE, Bt, Bt/E, Btv, Btv/E, and/or Btg horizons is more than 60 inches)
Btv/E1--16 to 22 inches; brownish yellow (10YR 6/6) silt loam; common fine and medium prominent red (2.5YR 4/8) mottles and common fine and medium distinct light yellowish brown (10YR 6/4) mottles; moderate coarse prismatic structure parting to moderate fine subangular blocky; firm; common fine and very fine continuous vesicular pores, lined with clay films; 25 percent plinthite; common distinct clay films on all faces of most peds; common thick silt coats on vertical prism faces; interfingering of light brownish gray (10YR 6/2) silt loam "E", 1 to 3 inches wide, make up about 25 percent of this horizon; few fine and medium roots in "E" part; many fine pores and root channels lined with dark gray clay films, and common fine iron and manganese nodules in "E" part; common crawfish Krotovinas, 1 to 3 inches wide; very strongly acid; gradual irregular boundary.
Btv/E2--22 to 32 inches; brownish yellow (10YR 6/6) silt loam; few fine prominent red (2.5YR 4/8) mottles, common medium faint light yellowish brown (10YR 6/4) mottles, and common fine distinct light brownish gray (10YR 6/2) mottles; moderate very coarse prismatic structure parting to moderate fine subangular blocky; firm; few fine and very fine continuous vesicular pores, lined with dark gray (10YR 4/1) clay films; 12 percent plinthite; many distinct clay films on all faces of most peds; few fine soft iron and manganese nodules; common thick silt coats on vertical prism faces; tongues of light brownish gray (10YR 6/2) silt loam "E" 1 to 6 inches wide make up about 35 percent of this horizon; few fine and very fine roots in tongues and along seams; common crawfish Krotovinas, 1 to 3 inches wide; very strongly acid; gradual irregular boundary.
Bt/E1--32 to 49 inches; brownish yellow (10YR 6/8) silt loam; common medium distinct light brownish gray (10YR 6/2) mottles and few fine prominent red (2.5YR 4/8) mottles; moderate very coarse prismatic structure parting to moderate coarse subangular blocky; firm; few fine and very fine continuous vesicular pores; common faint discontinuous clay films on vertical ped faces; 4 percent plinthite; common thick red (2.5YR 4/8) oxidation stains on ped faces; tongues of light brownish gray (10YR 6/2) silt loam "E" 1 to 6 inches wide, make up about 25 percent of this horizon; (few fine and very fine roots; few very fine continuous vesicular pores; common fine root channels and common fine pieces of charcoal in tongues); common crawfish krotovinas, 1 to 3 inches wide; very strongly acid; gradual irregular boundary.
Bt/E2--49 to 62 inches; yellowish brown (10YR 5/6) silt loam; common fine distinct light brownish gray (10YR 6/2) mottles; moderate coarse prismatic structure parting to moderate medium subangular blocky; firm; common fine and very fine continuous vesicular pores; few distinct strong brown (7.5YR 5/6) oxidation stains (lepidocrocite) on ped faces and lining root channels and pores; 2 percent plinthite; tongues and interfingering of grayish brown (10YR 5/2) silt loam "E", 1 to 6 inches wide, make up about 17 percent of this horizon; (very few fine roots, and many fine pieces of charcoal in tongues); common crawfish krotovinas, 1 to 3 inches wide; very strongly acid; gradual wavy boundary.
Bt2--62 to 75 inches; brownish yellow (10YR 6/6) silt loam; common medium distinct light brownish gray (10YR 6/2) mottles; moderate very coarse prismatic structure parting to moderate medium subangular blocky; firm; 2 percent plinthite; common very fine to medium continuous vesicular pores, lined with dark gray (10YR 4/2) clay films; common distinct clay films on all faces of most peds; common prominent red (2.5YR 4/6) oxidation stains on ped faces; common fine strong brown (7.5YR 5/6) oxidation stains (lepidocrocite) lining root channels; interfingering of light brownish gray (10YR 6/2) silt loam "E" 1 to 3 inches wide, make up about 8 percent of this horizon; thick silt coats on vertical prism faces; strongly acid; gradual wavy boundary.
Btg--75 to 90 inches; light gray (10YR 7/2) silt loam; common medium distinct yellowish brown (10YR 5/8) mottles; weak very coarse prismatic structure parting to weak medium subangular blocky; firm; common fine and very fine continuous vesicular pores, lined with dark gray (10YR 4/2) clay films; distinct continuous clay films on all faces of most peds; many fine root channels lined with strong brown (7.5YR 5/6) oxidation stains (lepidocrocite); very strongly acid; clear wavy boundary.
TYPE LOCATION: Beauregard Parish, Louisiana; 3.7 miles south southwest of Longville, LA; 2 miles south of Longville on U.S. Highway 171; 2 miles west on access road; 1 mile south on parish road; 1800 feet south and 750 feet east of northwest corner of sec. 11; NW1/4SW1/4 sec. 11, T. 6 S., R. 9 W. USGS Kernan 7.5 minute topographic quadrangle; latitude 30 degrees 33 minutes 27 seconds N. longitude 93 degrees 15 minutes 51 seconds W.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 50 to 90 inches. Depth to horizons that contain more than 5 to 30 percent plinthite ranges from 15 to 40 inches. Mottles with 1 or 2 chroma are at depths of 12 to 30 inches below the soil surface.
The A1 or Ap horizon has hue of 10YR, value of 3 to 5, and chroma of 1 to 3. It ranges from very strongly acid to slightly acid and is very fine sandy loam silt loam or fine sandy loam.
The E horizon and E part of the Bt1E horizon, where present, has hue of 10YR, value of 4 to 6, and chroma of 2 to 4. It ranges from very strongly acid to slightly acid and is very fine sandy loam silt loam or fine sandy loam.
The BE horizon, where present, has hue of 10YR, value of 4 to 6, and chroma of 3 to 6. Texture is silt loam. Reaction ranges from very strongly acid to slightly acid.
The Bt, Btv, and the Bt part of the Btv/E and Bt/E horizons have hue of 10YR, value of 4 to 6, and chroma of 3 to 8. Mottles are in shades of red, brown, or gray. Texture is silt loam or silty clay loam. Reaction ranges from very strongly acid to moderately acid.
The Btg, Btgv, and BCg horizons have hue of 10YR, 2.5Y, or 5Y, value of 5 to 7, and chroma of 1 to 3. Mottles are in shades of red, brown, or gray. Texture is silt loam, silty clay loam, clay loam, or silty clay. Reaction ranges from very strongly acid to moderately acid.
COMPETING SERIES: There are no other known series in the same family. Baxterville, Blevins, Bowie, Felker, Kirbyville, Malbis, Pinetucky, Robertsdale, Rogan, Saucier, Sawyer, and Tifton soils are in related families. Baxterville, Bowie, Malbis, Pinetucky, Rogan, and Tifton soils lack mottles of 2 chroma or less within 30 inches of the soil surface, and have control sections that contain more than 15 percent fine and coarser sand. Blevins soils lack mottles of 2 chroma or less within 30 inches of the soil surface, and have less than 5 percent plinthite. Felker and Sawyer soils have less than 5 percent plinthite. Kirbyville, Robertsdale, and Saucier soils have control sections that contain more than 15 percent fine and coarser sands.
GEOGRAPHIC SETTING: Beauregard soils are on concave sideslopes and ridge tops on terraces of Pleistocene age. Mainly of the Montgomery and Bentley formations. Slopes are typically 1 to 3 percent but range from 0 to 5 percent. The climate is warm and humid. Mean annual temperature ranges from 60 degrees to 70 degrees F., and mean annual precipitation from 45 to 60 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Blevins and Malbis series, and the Caddo, Guyton, and Messer series. Blevins and Malbis soils are on slightly higher convex ridge tops and side slopes. Caddo and Guyton soils are poorly drained and have a gray subsoil. Caddo soils are on broad flats at slightly higher elevations. Guyton soils are on lower positions on depressions and along drainageways. Messer soils are on convex mounds. Messer soils have a coarse-silty control section.
DRAINAGE AND PERMEABILITY: Beauregard soils are moderately well drained. Runoff is slow to medium and permeability is slow. A water table is at a depth of 1.5 to 3.0 feet below the surface December through March.
USE AND VEGETATION: Principal use is woodland and pasture land. Vegetation is longleaf pine, slash pine, loblolly pine, and bluestem and bermudagrass.
DISTRIBUTION AND EXTENT: Louisiana, Mississippi, and possibly Arkansas and Texas.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
Series Established: Beauregard Parish, Louisiana; 1928.
REMARKS: Diagnostic horizons and features of this soil include:
Ochric epipedon - the zone from 0 to 9 inches (A and E horizons)
Argillic horizon - the zone from 9 to 90 inches (Bt1, Btv/E1, Btv/E2, Bt/E2, Bt2, and Btg horizons)
Plinthic - the zone from 16 to 32 inches (Btv/E1, Btv/E2 horizons)
Aquic- gray mottles beginning at 22 inches
Additional Data: S90 LA011-15 (NSSL)