LOCATION PADGETT TXTentative Series
The Padgett series consists of very deep, moderately well drained, very slowly permeable soils that formed in recent clayey alluvium derived from Permian age sediments. These nearly level soils are on flood plains of wide creeks. Slope ranges from 0 to 1 percent. Mean annual temperature is about 62 degrees F., and mean annual precipitation is about 29 inches.
TAXONOMIC CLASS: Fine, mixed, active, thermic Chromic Haplusterts
TYPICAL PEDON: Padgett clay, rangeland (Colors are for dry soil unless otherwise stated.)
A1--0 to 3 inches; reddish brown (5YR 5/3) clay, reddish brown (5YR 4/3) moist: weak fine platy structure; extremely hard, very firm, sticky, plastic; common fine and medium roots; few very fine pores; noneffervescent; neutral; clear smooth boundary. (3 to12 inches thick)
A2--3 to 14 inches; reddish brown (5YR 5/3) clay, reddish brown (5YR 4/3) moist; weak medium subangular blocky structure; extremely hard, very firm, sticky and plastic; common fine and medium roots; few very fine pores; few fine and medium black stains; few fine concretions and soft masses of calcium carbonate; strongly effervescent; moderately alkaline; gradual wavy boundary. (0 to 11 inches thick)
Bss1--14 to 21 inches; reddish brown (2.5YR 4/4) clay, dark reddish brown (2.5YR 3/4) moist; weak fine angular blocky structure; extremely hard, very firm, sticky and plastic; few fine roots; few fine pores; common distinct slickensides 0.5 to 4 inches across and tilted 30 degrees from horizontal; many shiny pressure faces; few fine black concretions and stains; few fine concretions of calcium carbonate; strongly effervescent; moderately alkaline; gradual wavy boundary.
Bss2--21 to 38 inches; reddish brown (5YR 5/3) clay, reddish brown (5YR 4/3) moist; weak fine angular blocky structure; extremely hard, very firm, sticky and plastic; few fine roots; few fine pores, many distinct slickensides 3 to 16 inches across and tilted 25 to 55 degrees from horizontal; many shiny pressure faces; few fine black concretions; few fine concretions of calcium carbonate; strongly effervescent; moderately alkaline; gradual wavy boundary. ( Combined thickness of Bss horizon is 7 to 47 inches )
Bssk1--38 to 54 inches; reddish brown (5YR 5/3) clay, reddish brown (5YR 4/3) moist; weak fine angular blocky structure; extremely hard, very firm, sticky and plastic; few very fine roots; few fine pores; many distinct slickensides 2 to 8 inches across and tilted 30 degrees from horizontal; few shiny pressure faces; few fine black concretions; common fine concretions of calcium carbonate; strongly effervescent; moderately alkaline; gradual wavy boundary. (12 to 35 inches thick)
Bssk2--54 to 80 inches; reddish brown (5YR 5/3) clay, reddish brown (5YR 4/3) moist; moderate fine subangular blocky structure; extremely hard, very firm, sticky and plastic; few very fine pores; common distinct slickensides 0.5 to 2 inches across and tilted 30 to 45 degrees from horizontal; many shiny pressure faces; thin strata of reddish brown (5YR 5/4) silty material; common fine black stains; common fine concretions and soft masses of calcium carbonate; strongly effervescent; moderately alkaline.
TYPE LOCATION: Archer County, Texas; about 5.19 miles miles north on State Highway 79 to a small bridge from the intersection of State Highway 25 and State Highway 79 in Archer City; located about 2200 feet east of bridge in a rangeland area in the flood plain of the Little Wichita River. Latitude: 33 degrees, 40 minutes, 05 seconds North; Longitude: 98 degrees, 36 minutes, 17 seconds West. Archer City NE topographic quadrangle; NAD 1927.
RANGE IN CHARACTERISTICS:
Soil Moisture: An Ustic soil moisture regime. The soil is dry in some parts for more than 90 but less than 160 days, cumulative in normal years.
Mean annual soil temperature: 62 to 66.5 degrees F.
Vertic features: 14 to 80 inches This is a cyclic soil and undisturbed areas have gilgai microrelief with microknolls 3 to 8 inches higher than microdepressions.
Distance between the center of the microknoll and the center of the microdepression is about 5 to 15 feet. The microknoll makes up about 50 percent, the intermediate, or area between the knoll and depression, about 25 percent. When dry, cracks 0.5 to 2 inches wide extend from the surface to a depth of 45 inches or more. Cracks remain open for 150 or more cumulative days during most years. Slickensides begin at a depth of 6 to 15 inches.
Particle-size control section (weighted average)
Water table: During wet years a water table may occur between 60 and 80 inches.
Clay content: 45 to 60 percent
Sand content: 0 to 10 percent
A Horizon
Hue: 2.5YR to 7.5YR
Value: 4 or 5
Chroma: 2 to 4
In epipedons with moist value and chroma of 3 or less, the total thickness is less than 10 inches.
Texture: silty clay loam , clay, silty clay.
Clay content: 31 to 63 percent
Effervescence: non-effervescent to strongly effervescent
Reaction: slightly alkaline to moderately alkaline
Bss Horizon
Hue: 2.5YR or 5YR
Value: 3 to 5
Chroma: 3 to 6
Texture: silty clay or clay.
Clay content: 45 to 60 percent
Effervescence: very slightly effervescent to strongly effervescent
Visible calcium carbonate: amount 0 to 5 percent, size very fine to fine, location throughout
Reaction: slightly alkaline to moderately alkaline.
Bssk Horizon
Hue: 2.5YR or 5YR
Value: 4 or 5
Chroma: 4 to 6
Texture: silty clay, clay, clay loam, or silty clay loam
Clay content: 20 to 60 percent
Visible calcium carbonate: amount 2 to 10, size fine, location throughout
Effervescence: very slightly effervescent to strongly effervescent
Reaction: slightly alkaline to moderately alkaline.
COMPETING SERIES: There are no competing series. Similar soils are the
Cochina,
Lipan,
Miller,
Reap and
Stamford series. Lipan ,Reap and Stamford series have smectitic mineralogy.
Lipan series: are dominated by chroma or 2 or less.
Miller soils have a mollic epipedon, and a superactive CEC activity class.
Reap series: have hues of 7.5YR or yellower and are on terrace deposits.
Stamford series: are on uplands and have sola no thicker than 50 inches.
GEOGRAPHIC SETTING:
Parent material: recent clayey alluvium derived from Permian age sediments.
Landform: flood plains of wide creeks and rivers
Slope: 0 to 1 percent
Mean annual temperature: 60 to 64.5 degrees F.
Mean annual precipitation: 27 to 30 inches
Frost-free period: 210 to 230 days
Elevation: 850 to 1150 feet
Thornthwaite annual P-E indices: 40 to 60
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Port,
Mangum,
Westfork,
Weswood,
Wheatwood and the
Yomont series.
Port, Weswood and Wheatwood series: have fine-silty particle-size control section.
Mangum and Westfork soils: lack intersecting slickensides.
Mangum soils: contain strata and bedding planes within a depth of 50 inches
Westfork soils: have cumulic surfaces thicker than 20 inches.
Yomont soils: have coarse-silty particle-size control section.
DRAINAGE AND PERMEABILITY: Moderately well drained. Very slow permeability. Runoff is high.
USE AND VEGETATION: Used mostly as rangeland, but some areas are cropped to small grains, cotton and forage sorghums. Native vegetation is buffalograss, Texas wintergrass, vine mesquite, western wheatgrass, canada wildrye with an overstory of scattered pecan, green ash, oak species and hackberry.
Mesquite is a common invader.
DISTRIBUTION AND EXTENT: LRR H; MLRA 80A and 78C; moderate extent
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES PROPOSED: Archer County, Texas, 1998, Archer County soil survey area, Texas. The name Padgett is a small community in northwest Young County, Texas
REMARKS: These soils were formerly included in the Mangum series.
Diagnostic horizons and features recognized in this pedon are:
Particle size control section: 10 to 40 inches.
Ochric epipedon: 0 to 14 inches. (A horizons)
Cambic horizon: 14 to 80 inches. (Bss horizons)
Vertic features: The presence of slickensides at 14 to 80 inches. (Bss horizons)
Vertic features: Deep wide cracks that are open 150 to 209 cumulative days in most years.
Vertic features: Gilgai microrelief on undisturbed areas.
Additional Comments:
The assignment of the cation-exchange activity class is supported by laboratory data number S81TX-009-009 from Archer county, Texas.
Taxonomic version: Soil Taxonomy, Second Edition, 1999