LOCATION HEBERT LA+AREstablished Series
The Hebert series consists of very deep, somewhat poorly drained, moderately slowly permeable soils that formed in silty alluvium. These soils are on natural levees along present and abandoned channels of the Arkansas and Red Rivers. Slopes range from 0 to 5 percent.
TAXONOMIC CLASS: Fine-silty, mixed, active, thermic Aeric Epiaqualfs
TYPICAL PEDON: Hebert silt loam, in a cultivated field. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 7 inches; dark grayish brown (10YR 4/2) silt loam; weak very fine granular structure; friable; common very fine dark yellowish brown and black concretions; many fine roots; slightly acid; abrupt smooth boundary. (4 to 10 inches thick)
E--7 to 10 inches; light brownish gray (10YR 6/2) silt loam; very weak coarse platy structure; friable; few fine roots; common fine distinct dark yellowish brown and black concretions; slightly acid; clear wavy boundary. (0 to 10 inches thick)
Bt1--10 to 14 inches; light brownish gray (10YR 6/2) loam; many fine distinct strong brown mottles; weak medium subangular blocky structure; firm; few fine roots; few fine pores; common distinct very dark gray (10YR 3/1) clay films in pores and on peds; many distinct light gray (10YR 7/2) silt coatings are up to 1 mm thick on surfaces of peds; common fine reddish brown concretions; very strongly acid; clear wavy boundary. (0 to 14 inches thick)
Bt2--14 to 24 inches; reddish brown (5YR 5/3) clay loam; common fine distinct light brownish gray mottles; compound moderate medium prismatic and moderate medium subangular blocky structure; very hard, firm; common distinct clay films on peds and in pores; many distinct light brownish gray (10YR 6/2) silt coatings on peds; few fine yellowish red concretions; very strongly acid; clear wavy boundary. (8 to 12 inches thick)
Bt3--24 to 30 inches; reddish brown (5YR 5/4) loam; common fine distinct light brownish gray mottles; compound moderate medium prismatic and moderate medium subangular blocky structure; very hard; firm; few fine roots; few fine pores; common distinct clay films in pores and on peds; many distinct light brownish gray (10YR 6/2) silt coatings on peds; few fine black concretions; strongly acid; clear wavy boundary. (0 to 12 inches thick)
Bt4--30 to 37 inches; reddish brown (5YR 4/4) silty clay loam; common fine distinct brown mottles; compound moderate medium prismatic and moderate medium subangular blocky structure; very hard; firm; few fine roots; few fine pores; common distinct clay films in pores and on peds; many distinct and faint light brownish gray (10YR 6/2), brown (7.5YR 5/2), and reddish brown (5YR 4/4) silt coatings on surfaces of peds; few fine black concretions; strongly acid; clear wavy boundary. (0 to 10 inches thick)
BC--37 to 50 inches; brown (7.5YR 5/4) silt loam; common fine distinct light brownish gray mottles; weak medium prismatic structure; firm; few fine pores; common faint clay films in some pores; common fine strong brown and few fine black concretions; moderately acid; gradual boundary. (8 to 20 inches thick)
C--50 to 72 inches; reddish brown (5YR 5/4) silt loam; common fine distinct light brownish gray mottles; massive; friable; few medium black stains and concretions; slightly acid.
TYPE LOCATION: Ouachita Parish, Louisiana; 4.7 miles southeast of Monroe on Louisiana Highway 15; 325 feet east to a point 315 feet north of oilfield road; 460 feet north and 80 feet east of southwest corner sec. 26, T. 17 N., R. 4 E.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 36 to 72 inches. The effective cation exchange capacity is 20 to 50 percent, saturated with exchangeable aluminum in the control section.
The A or Ap horizon has hue of 10YR, value of 4 or 5, and chroma of 2 or 3. Texture is very fine sandy loam, silt loam, or silty clay loam. Reaction ranges from very strongly acid to neutral.
The E horizon has hue of 10YR, value of 5 to 7, and chroma of 1 to 3. Texture is very fine sandy loam, loam, or silt loam. Reaction ranges from very strongly acid to neutral.
The Bt horizon typically has hue of 5YR or 7.5YR, value of 4 or 5, and chroma of 3 or 4. In subhorizons of some pedons it has hue of 10YR, value of 4 to 6, and chroma of 2 or 3. Some of the peds have 1 or 2 chroma silt coats that are as thick as 1 mm. Texture is loam, silt loam, or silty clay loam. Sand content ranges from 10 to 20 percent, dominanted by very fine sand. Reaction ranges from very strongly acid to slightly acid in all parts of the Bt horizon, but it is typically very strongly acid or strongly acid in the upper part and moderately acid or slightly acid in the lower part.
The BC and C horizons have the same color range as the Bt horizon. Texture is fine sandy loam, silt loam, or silty clay loam. In some pedons the C horizon is stratified. Reaction ranges from strongly acid to mildly alkaline.
COMPETING SERIES: These include the Acy, Dundee, Essen, Frozard, Galvez, Idee, McGehee, Norene, and Potoutville series in the same family and the Gallion, Hillemann, and Rilla series in similar families. Acy, Frozard, Galvez and Idee soils have Bt horizons with browner hues. Dundee, Essen, Hilleman, Norene, and Patoutville soils have hues yellower than 7.5YR and lack the prominent silt coatings. In addition, Essen soils are alkaline. Hillemann soils have sodium accumulations in the lower part of the B horizon, and Patoutville soils have less than 10 percent total sand and have red mottles. Gallion soils lack the prominent silt coatings, lack the gray ped surfaces and are not as acid. McGehee soils have thin silt coatings in the upper B horizons but are underlain by acid clay which lacks the prominent silt coatings. Rilla soils lack 1 or 2 chroma silt coats on peds.
GEOGRAPHIC SETTING: Hebert soils occur mainly on level to gently sloping natural levees along present and abandoned channels of the Arkansas River. The water table is at a depth of 36 inches or less for periods up to 1 month duration mostly in winter and spring. The soil formed in silty alluvium of mixed mineralogy. The climate is warm and humid. Average annual rainfall ranges from 45 to 55 inches. Mean annual temperature ranges from 60 to 70 degrees F. P-E index ranges from 68 to 74.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing McGehee and Rilla series and the Mer Rouge, Perry, and Portland series. Mer Rouge soils have a mollic epipedon. Perry soils have very fine textures. Portland soils have very fine textures and are alkaline.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow runoff; moderately slow permeability. Apparent seasonal high water table is 1.5 to 3.0 feet below the surface, December through April. Flooding ranges from none to frequent.
USE AND VEGETATION: Most areas are used for pasture and cultivated crops such as cotton, soybeans, or corn. Original vegetation was bottomland hardwood forest.
DISTRIBUTION AND EXTENT: Northeast Louisiana and Arkansas. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Ouachita Parish, Louisiana; 1964.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon.................0 to 10 inches (Ap,E) Albic horizon......................7 to 10 inches (E) Argillic horizon....10 to 37 inches (Bt1,Bt2,Bt3,Bt4) Aquic
moisture regime