LOCATION POTEET TXEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, active, hyperthermic Pachic Paleustolls
TYPICAL PEDON: Poteet fine sandy loam--rangeland. (Colors are for dry soil unless otherwise stated.)
A--0 to 24 inches; dark brown (10YR 4/3) fine sandy loam, dark brown (10YR 3/3) moist; weak fine granular and weak fine subangular blocky structure; hard, friable; common fine and medium roots; common fine and medium pores; mildly alkaline, clear smooth boundary. (14 to 36 inches thick)
Bt1--24 to 31 inches; dark grayish brown (10YR 4/2) sandy clay loam, very dark grayish brown (10YR 3/2) moist; many medium distinct mottles of red (2.5YR 4/6), few mottles of light yellowish brown (10YR 6/4), and very dark brown (10YR 2/2); moderate fine and medium blocky structure; very hard, very firm; common fine and medium roots mainly in the upper one inch and between peds; few fine pores; distinct clay films on faces of peds; neutral; clear smooth boundary. (2 to 16 inches thick)
Bt2--31 to 42 inches; brown (10YR 5/3) sandy clay loam, dark brown (10YR 4/3) moist; few fine faint mottles of reddish yellow (7.5YR 6/6), light yellowish brown (10YR 6/4) and a few streaks of very dark grayish brown (10YR 3/2); weak fine and medium blocky structure; very hard, firm; few fine roots mainly between peds, few fine pores; patchy clay films on faces of peds; few dark brown concretions 2 to 55 mm in size; neutral, gradual smooth boundary. (4 to 20 inches thick)
Bt3--42 to 48 inches; brown (10YR 5/3) sandy clay loam, dark brown (10YR 4/3) moist; common medium distinct mottles of brownish yellow (10YR 6/6), light brownish gray (10YR 6/2) and light yellowish brown (2.5Y 6/4); moderate fine and medium subangular blocky structure; hard, firm; few fine roots and fine pores; patchy clay films on faces of peds; few small dark brown concretions; neutral; gradual smooth boundary. (0 to 18 inches thick)
BCk--48 to 72 inches; pale brown (10YR 6/3) sandy clay loam, brown (10YR 5/3) moist; common medium and coarse distinct mottles of strong brown (7.5YR 5/6), and light yellowish brown (2.5Y 6/4); weak fine subangular blocky structure; hard, friable; common fine pores; few soft masses of calcium carbonate; few small dark brown concretions; calcareous; moderately alkaline.
TYPE LOCATION: Atascosa County, Texas; 3.6 miles south on Farm Road 140 from its junction with Texas Highway 97 in Charlotte, 2.5 miles south on county road and 50 feet east in native rangeland.
RANGE IN CHARACTERISTICS: Solum thickness is 60 to more than 80 inches. The mollic epipedon is 20 to 40 inches thick. Secondary carbonates occur below 36 inches.
The A horizon has colors in hue of 10YR, 7.5YR, or 5YR with value of 3 and 4, and chroma of 2 and 3. It is medium acid through mildly alkaline. It is fine sandy loam or very fine sandy loam.
The Bt1 and Bt2 horizons have colors in hue of 10YR, 7.5YR, and 5YR, with value of 3 through 5, and chroma of 1 through 4. They contain few to many, faint to prominent reddish, brownish, yellowish, or grayish mottles. These horizons are sandy clay loam, clay loam, or sandy clay with the upper part being the most clayey. The upper 20 inches of the Bt horizon ranges from 23 to 35 percent clay. These horizons are slightly acid through moderately alkaline.
The Bt3 horizon has colors in hue of 10YR, 7.5YR, 5YR, and 2.5YR with value of 3 through 6, and chroma of 3 through 8. They are sandy clay loam or clay loam with 0 to 10 percent visible concretions and soft bodies of calcium carbonate. They are mildly through moderately alkaline.
The BCk horizon has colors with value and chroma that are 1 or 2 units higher than the horizons above. Pedons with chroma of 4 or less have common coarse mottles with chroma of 6 or 8. It is sandy clay loam, clay loam, or fine sandy loam with 0 to 10 percent visible concretions and soft masses of calcium carbonate and a few dark brown concretions. It is neutral to moderately alkaline.
COMPETING SERIES: There are no competing series in this family. Series in similar families include the Amphion, Bethany, Darrouzett, Dina, Hanis, Hollister, Liv, Matfield, and Rotan series. Amphion and Hanis soils have thinner surfaces. Bethany, Darrouzett, Hollister, and Rotan soils have a mean annual soil temperature less than 72 degrees F. Dina, Liv, and Matfield soils have more than 35 percent coarse fragments in the Bt horizon.
GEOGRAPHIC SETTING: Poteet soils occupy nearly level, slightly concave positions in weakly depressed drainageways and nearly level low terraces. Slopes are less than 2 percent. The soil formed in clayey and loamy sediments. Occasional to frequent flooding occurs. Occasionally flooded areas receive damaging floodwaters about once every 4 or 5 years, but receive some runoff, mostly beneficial to crop growth, after every rainstorm. Frequently flooded areas receive damaging floodwaters at least once every two years. Mean annual precipitation ranges from 20 to 30 inches and mean annual air temperature ranges from 69 to 72 degrees F. Frost-free days range from 240 to 280 days and elevation ranges from 400 to 800 feet. Thornthwaite P-E index ranges from 24 to 40.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the similar Amphion and Hanis series as well as the Miguel, Opelika, Papalote, and Wilco series. Amphion and Hanis soils are on adjoining plains and have finer textured A horizons. Miguel, Opelika, and Papalote soils have thinner surfaces and in addition Miguel and Papalote soils do not receive outside water. Wilco soils lack mollic colors, have sandy epipedons less than 20 inches thick and do not receive outside water.
DRAINAGE AND PERMEABILITY: Moderately well drained, slow runoff, slowly permeable.
USE AND VEGETATION: Used mainly for rangeland and pastureland. In excellent condition, the native vegetation is predominantly mid grasses with a few liveoak and hackberry trees, and with scattered shrubs, a few short grasses and about 5 percent perennial forbs. With retrogression typical increasers and invaders are mesquite, spiny hackberry, pricklypear, hooded windmillgrass, threeawn, Halls panicum, red lovegrass, fringed signalgrass, grassbur, and annual forbs.
DISTRIBUTION AND EXTENT: Northern Rio Grande Plains of Texas. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Atascosa County, Texas; 1977.
REMARKS: These soils were formerly included as a depressed part of the Papalote series.
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - 0 to 31 inches.
Argillic horizon - 24 to 48 inches.