LOCATION TROUP AL+FL GA MS NC SCEstablished Series
TAXONOMIC CLASS: Loamy, kaolinitic, thermic Grossarenic Kandiudults
TYPICAL PEDON: Troup fine sand, on a convex 3 percent slope, in forest. (Colors are for moist soils.)
A--0 to 3 inches; very dark grayish brown (10YR 3/2) fine sand; weak fine and medium granular structure; very friable; very strongly acid; clear wavy boundary. (2 to 11 inches thick)
E1--3 to 15 inches; yellowish brown (10YR 5/4) fine sand; single grained; very friable, 10 to 15 percent of sand grains uncoated; very strongly acid; gradual wavy boundary.
E2--15 to 40 inches; strong brown (7.5YR 5/6) loamy fine sand; single grained; very friable; common medium sized pockets of pale brown (10YR 6/3) uncoated sand grains; very strongly acid; gradual wavy boundary.
E3--40 to 53 inches; reddish yellow (7.5YR 6/6) loamy fine sand; single grained; loose; many coarse distinct red (2.5YR 5/8) spheroidal bodies in lower part with sand grains coated and bridged; these bodies are friable and have weak medium subangular blocky structure; common medium sized pockets of pale brown (10YR 6/3) uncoated sand grains; strongly acid; gradual wavy boundary. (Combined thickness of the E horizon is 31 to 75 inches)
Bt1--53 to 65 inches; red (10R 4/6) sandy clay loam; weak medium subangular blocky structure; friable; sand grains coated and bridged with clay; few fine streaks of reddish yellow (7.5YR 6/6) clean sand grains; strongly acid; gradual wavy boundary.
Bt2--65 to 120 inches; red (10R 4/6) sandy clay loam; weak medium and coarse subangular blocky structure; friable; sand grains coated and bridged with clay; few fine quartz gravel; strongly acid; gradual smooth boundary. (The Bt horizon is 6 to more than 20 inches thick)
TYPE LOCATION: Escambia County, Alabama; 0.6 mile east of Hendley- Roberts School on Alabama Highway 4 and 1.5 miles north on paved road to Dixie, Alabama, 400 feet west of road, NW1/4NW1/4NW1/4 sec. 5, T. 1 N., R. 13 E.
RANGE IN CHARACTERISTICS: Solum thickness is more than 80 inches. Reaction of the surface and subsurface layers ranges from very strongly acid to medium acid, except where limed, and from very strongly acid to strongly acid in the subsoil. Base saturation of the control section is less than 30 percent and calcium content is less than 1 meq per 100 grams of soil. Thickness of the A and E horizons ranges from 40 to 79 inches. Percent by volume of quartz gravel and ironstone nodules ranges up to 10 percent in the solum.
The A or Ap horizon has hue of 7.5YR or 10YR, value of 3 to 6, and chroma of 2 to 4. Texture is coarse sand, sand, fine sand, loamy sand, or loamy fine sand.
The E horizon has hue of 5YR to 10YR, value of 4 to 8, and chroma of 3 to 8. Texture is coarse sand, sand, fine sand, loamy sand, or loamy fine sandy. Most pedons have few to common uncoated sand grains.
The BE horizon, where present, has hue of 5YR to 10YR, value of 5 to 7, and chroma of 4 to 8. Texture is sandy loam or fine sandy loam.
The Bt horizon has hue of 10R to 5YR, value of 4 to 7, and chroma of 4 to 8. Some pedons have Bt horizons with hue of 7.5YR or 10YR, value of 5 to 7, and chroma of 4 to 8. Texture of the Bt horizon is sandy loam, fine sandy loam, or sandy clay loam, and below the control section, the range includes clay loam or sandy clay. Percent plinthite by volume within 60 inches of the surface is less than 5 percent.
The C or BC horizon, where present, is mottled or it is red sandy or loamy material.
COMPETING SERIES: There are no other soils in this family. Soils is similar families are the Albany, Blanton, Bonifay, Conroe, Darco, Eddings, Murad, Shankler, and Tehran series. Albany, Blanton, Eddings, and Murad soils have a seasonally high water table within 6 feet of the surface. Bonifay and Conroe soils have more than 5 percent plinthite within 60 inches of the surface and Conroe soils have a clayey particle- size control section. Darco and Shankler soils have a greater summer moisture deficit. Tehran soils have calcium carbonate content of more than 1 meq per 100 grams soil.
GEOGRAPHIC SETTING: Troup soils occur on nearly level to steep Coastal Plain uplands and side slopes. Slopes are dominantly 0 to 15 percent but range to 40 percent. The regolith is unconsolidated marine or fluvial deposits of sands and sandy clay loams. The climate is warm and humid. Near the type location the mean annual air temperature is about 66 degrees F. The mean annual precipitation is about 60 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the Albany soils on lower positions and the Blanton soils on smoother, less sloping positions; and the Alaga, Bama, Dothan, Eustis, Lakeland, Lucy, Orangeburg, Smithdale, Springhill, and Wagram series. Alaga, Albany, Bama, Blanton, Eustis, Lakeland and Smithdale soils do not have Kandic horizons. Alaga and Lakeland soils are on similar positions as the Troup soils, but do not have a Bt horizon within 80 inches of the surface. Bama, Dothan, Orangeburg, Smithdale, and Springhill soils are on slightly higher positions and do not have a sandy epipedon as thick as 40 inches. Eustis soils are on similar positions as Troup soils and have a sandy Bt horizon. Lucy and Wagram soils are also on similar positions and have a sandy epipedon which is 20 to 40 inches thick.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is slow. Permeability is moderate in the Bt horizon and rapid in the A and E horizons.
USE AND VEGETATION: Most areas of of Troup soils are in forests of pine and mixed hardwoods. Cleared areas are used for growing peanuts, watermelons, vegetables, and for pasture.
DISTRIBUTION AND EXTENT: Alabama, Arkansas, Florida, Georgia, Louisiana, Mississippi, North Carolina, South Carolina, and Texas. The series is of large extent.
MLRA OFFICE RESPONSIBLE: Auburn, Alabama
SERIES ESTABLISHED: Houston County, Alabama; 1965.
REMARKS: This revision (1/89) changes the classification from Paleudult to Kandiudult in recognition of the low activity clay amendment.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon (and grossarenic feature) - A and E horizons (0-53 inches).
Kandic horizon - The Bt horizons (53-120 inches).