LOCATION RODESSA TXEstablished Series
TAXONOMIC CLASS: Fine, mixed, active, thermic Aquic Glossudalfs
TYPICAL PEDON: Rodessa loam--forested. (Colors are for moist soil unless otherwise stated.)
A11--0 to 8 inches; brown (10YR 5/3) loam; many coarse faint brown (10YR 4/3) mottles; moderate fine granular structure; slightly hard, very friable; top 1 inch contains partially decayed hardwood litter; many fine roots; few krotovinas filled with brown (10YR 4/3); strongly acid; gradual smooth boundary. (4 to 10 inches thick)
A12--8 to 18 inches; light yellowish brown (10YR 6/4) loam; weak fine subangular blocky structure; slightly hard, very friable; many fine roots; few fine pores; few medium pores lined with clay; strongly acid; gradual smooth boundary. (6 to 12 inches thick)
B1--18 to 28 inches; light yellowish brown (10YR 6/4) loam; outside of peds are yellowish brown (10YR 5/4); weak medium subangular blocky structure; slightly hard, very friable; common fine roots; few thin patchy clay films on surfaces of peds; very strongly acid; abrupt wavy boundary. (6 to 12 inches thick)
A'&B--28 to 31 inches; the A'2 part of this horizon, comprising about 60 percent, is white (10YR 8/2) loam that extends through the horizon and surrounds peds of pale brown (10YR 6/3) loamy B material; common medium distinct strong brown (7.5YR 5/6) and few medium faint light brownish gray (10YR 6/2) mottles; weak fine and medium subangular blocky structure; slightly hard, very friable; few fine roots; strongly acid; abrupt wavy boundary. (2 to 5 inches thick)
Btg&A'--31 to 36 inches; the Bt part of this horizon, comprising about 65 percent, is gray (10YR 5/1) clay; the A'2 material is white (10YR 8/2) loam that coats the top and sides of peds; many coarse prominent dark red (2.5YR 3/6) and common medium distinct reddish brown (5YR 4/4) mottles; strong coarse blocky structure; extremely hard, very firm; few pressure faces; few vertical cracks are filled with gray (10YR 6/1) loam; few fine roots; very strongly acid; gradual smooth boundary. (4 to 8 inches thick)
B22t--36 to 49 inches; dark reddish brown (5YR 3/4) clay; common medium faint dark reddish gray (5YR 4/2) and few fine distinct dark red mottles; moderate coarse blocky structure; extremely hard, very firm; thick patchy clay films; common slickensides; light yellowish brown (10YR 6/4) silt coatings on faces of a few peds; very strongly acid; gradual smooth boundary. (10 to 18 inches thick)
B23t--49 to 72 inches; dark brown (7.5YR 4/4) clay; few medium distinct grayish brown (10YR 5/2) and yellowish brown (10YR 5/8) mottles; weak coarse blocky structure; extremely hard, very firm; few vertical streaks of light yellowish brown (10YR 6/4) loam; few slickensides and pressure faces; slightly acid.
TYPE LOCATION: Red River County, Texas; 12.65 miles north of Clarksville Courthouse to International Paper Co. road number 32; west on Paper Co. Road 0.25 mile; site is north of road 100 feet in mound.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 60 to over 100 inches.
The A11 horizon is dark grayish brown (10YR 4/2), brown (10YR 4/3, 5/3), dark yellowish brown (10YR 4/4), yellowish brown (10YR 5/4), or pale brown (10YR 6/3). The A12 horizon is light yellowish brown (10YR 6/4), very pale brown (10YR 7/3, 7/4), yellowish brown (10YR 5/4), or pale brown (10YR 6/3). The A horizons are loam or fine sandy loam and very strongly acid through slightly acid.
The B1 horizon is light yellowish brown (10YR 5/4), very pale brown (10YR 7/3, 7/4), yellowish brown (10YR 5/4, 5/6), or pale brown (10YR 6/3). It is loam or fine sandy loam and very strongly acid through medium acid.
The A'2&B horizon is white (10YR 8/2), light gray (10YR 7/1, 7/2), gray (10YR 5/1, 6/1), light brownish gray (10YR 6/2), or grayish brown (10YR 5/2). It is loam or fine sandy loam and is very strongly acid through medium acid. The A'2 material comprises 60 to 75 percent of the horizon. The Btg&A' horizon is gray (10YR 5/1, 6/1), dark gray (10YR 4/1), light brownish gray (10YR 6/2), or grayish brown (10YR 5/2).
The Bt part of this horizon is yellowish brown (10YR 5/4, 5/6, 5/8), or pale brown (10YR 6/3) in some pedons. Mottles are red (2.5YR 4/6, 4/8), dark red (2.5YR 3/6), yellowish red (5YR 4/6, 4/8), reddish brown (5YR 4/4), strong brown (7.5YR 5/6, 5/8), or brown (7.5YR 5/4). The Bt part of this horizon is clay or clay loam that comprises 70 to 90 percent of the matrix. This horizon is very strongly acid through medium acid.
The B22t and B23t horizons are dark reddish brown (5YR 3/4), dark red (2.5YR 3/6), red (2.5YR 4/6, 4/8), yellowih red (5YR 4/6, 4/8), dark brown (7.5YR 4/4), or reddish brown (5YR 4/4). Mottles with chromas of 2 or less occur throughout and yellowish brown mottles ranges from none to common. These horizons are clay or clay loam and are very strongly acid through slightly acid. Few to many slickensides are present in the lower part, normally below 40 inches.
COMPETING SERIES: These include the Addielou, Atasco, Boswell, Bryarly, Counts, Duralde, Frizzell, Glenmora, Gore, Iredell, Kipling, Messer, Porum, Raino, Sesquehanna, Whakana, and Woodtell series. Addielou, Duralde, Frizzell, Glenmora, and Raino soils have less than 35 percent clay in the control section; in addition, Frizzell, Glenmora, and Raino soils have siliceous mineralogy. Atasco soils lack hues redder than 7.5YR in the Bt horizon. Boswell, Bryarly, Gore, Iredell, Kipling, Susquehanna, and Woodtell soils crack when dry and have no tonguing of an albic horizon into the Bt horizon. Counts soils have browner Bt horizons and do not have an albic horizon that tongues into the Bt horizon. Messer soils have less than 18 percent clay in the B horizon and have no gray mottles in the upper 10 inches of the B horizon. Porum and Whakana soils have albic materials in some subsurface horizon of the Bt horizon; in addition, Whakana soils lack gray mottles in the upper Bt horizon.
GEOGRAPHIC SETTING: Rodessa soils are on nearly level uplands and terraces. They normally occupy circular mounds 30 to 200 feet in diameter and 20 to 40 inches higher than the intermound landscape. Slope gradients are less than 2 percent and are mainly convex. The soils formed in clay alluvium. The climate is warm humid. The average annual precipitation near the type location is about 43 inches. The average annual temperature is about 64 degrees F. and the annual Thornthwaite P-E index is about 72.
GEOGRAPHICALLY ASSOCIATED SOILS: These are primarily the Wrightsville series which have chroma of 2 or less throughout the Bt horizon and occupy intermound positions in relation to Rodessa soils.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow runoff; slow internal drainage; very slow permeability.
USE AND VEGETATION: Mainly used for pasture and woodland. Bermudagrass and Dallisgrass are the dominant tame pasture plants. Water oak, willow oak, post oak, and red oak are the dominant trees. Some areas have loblolly pine and shortleaf pine.
DISTRIBUTION AND EXTENT: Northeast Texas. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Red River County, Texas; 1972.
REMARKS: Rodessa soils were formerly classified in the Red-Yellow Podzolic great soil group.