LOCATION EDROY              TX

EDROY SERIES

TAXONOMIC CLASS: Fine, smectitic, hyperthermic Ustic Epiaquerts

TYPICAL PEDON: Edroy clay--on a 0.2 percent slope in cropland; elevation is 11 meters (37 ft). (Colors are for moist soil unless otherwise stated)

Ap--0 to 18 cm (0 to 7 in); black (2.5Y 2.5/1) clay, very dark gray (10YR 3/1) dry; weak fine subangular blocky and moderate medium granular structure; very hard, firm; few very fine roots; common fine vesicular pores; neutral; clear smooth boundary. (Thickness of the Ap horizon is 13 to 23 cm [5 to 9 in].)

Bw--18 to 46 cm (7 to 18 in); black (2.5Y 2.5/1) clay, very dark gray (10YR 3/1) dry; moderate medium angular blocky structure; very hard, firm; few very fine tubular pores; 1 percent faint pressure faces; 1 percent faint sand coats on vertical faces of peds; 1 percent fine prominent spherical dark brown (7.5YR 3/2) iron-manganese nodules; 1 percent fine prominent strong brown (7.5YR 4/6) masses of iron-manganese with sharp boundaries lining pores; neutral; gradual smooth boundary. (Thickness of the Bw horizon is 15 to 46 cm [6 to 18 in].)

Bss1--46 to 104 cm (18 to 41 in); very dark gray (2.5Y 3/1) clay, dark gray (10YR 4/1) dry; moderate medium angular blocky structure; very hard, very firm; few very fine tubular pores; 5 percent faint pressure faces; 15 percent faint slickensides; 1 percent faint sand coats on vertical faces of peds; 1 percent fine prominent dark brown (7.5YR 3/3) masses of iron-manganese with sharp boundaries in matrix; neutral; gradual wavy boundary.

Bss2--104 to 145 cm (41 to 57 in); 80 percent dark gray (10YR 4/1) and 20 percent very dark gray (10YR 3/1) clay, 80 percent gray (10YR 5/1) and 20 percent dark gray (10YR 4/1) dry; moderate coarse subangular blocky structure; very hard, very firm; 10 percent faint pressure faces; 10 percent distinct slickensides; 1 percent fine faint black (10YR 2/1) masses of iron-manganese with sharp boundaries in matrix; slightly alkaline; gradual wavy boundary. (Combined thickness of the Bss horizons is 74 to 137 cm [29 to 54 in].)

Bkss--145 to 178 cm (57 to 70 in); 90 percent light gray (2.5Y 7/2) and 10 percent dark gray (10YR 4/1) clay, 90 percent light gray (2.5Y 7/2) and 10 percent gray (10YR 5/1) dry; weak very coarse subangular blocky structure; very hard, very firm; 1 percent faint pressure faces; 5 percent distinct slickensides; 1 percent fine distinct black (10YR 2/1) masses of iron-manganese with sharp boundaries in matrix; 1 percent fine masses of calcium carbonate; 1 percent fine weakly cemented nodules of calcium carbonate; moderately alkaline; wavy boundary. (Thickness of the Bkss horizon is 25 to 102 cm [10 to 54 in].)

2Bk--178 to 203 cm (70 to 80 in); pale yellow (2.5Y 7/3) sandy clay loam, pale yellow (2.5Y 7/3) dry; massive; hard, firm; 3 percent fine and medium masses of calcium carbonate; 1 percent fine and medium weakly cemented nodules of calcium carbonate; slight effervescence; moderately alkaline.

TYPE LOCATION: Kleberg County, Texas; from the intersection of Texas Highways 70 and 892 east of Bishop in Nueces County; about 1.3 miles west on Texas Highway 70; 1 mile south on private farm road; 30 feet south in depression in cropland. (Latitude: 27 degrees, 33 minutes, 32 seconds N; Longitude: 97 degrees, 41 minutes, 2.8 seconds W. Concordia USGS topographic quadrangle; NAD 83).

RANGE IN CHARACTERISTICS:
Soil Moisture: An aquic soil moisture regime.
Mean annual soil temperature: 22 to 23 degrees C (72 to 74 degrees F)
Depth to sandy or loamy sediments is 102 to 152 cm (40 to 60 in)
Depth to secondary calcium carbonate: 64 to 157 cm (25 to 62 in)

Particle-size control section (weighted average)
Clay content: 35 to 50 percent

A horizon
Hue: 10YR or 2.5Y
Value: 2 to 4
Chroma: 1
Texture: clay loam, sandy clay, or clay
Clay content: 35 to 45 percent
Redox concentrations: amount-0 to 2 percent, shades-brown
Iron-manganese concentrations: amount-0 to 1 percent, kind-nodules
EC (dS/m): 0 to 2
SAR: 0 to 2
Reaction: slightly acid or neutral

Bw horizon
Hue: 10YR or 2.5Y
Value: 2 to 4
Chroma: 1 or 2
Texture: clay loam, sandy clay, or clay
Clay content: 35 to 45 percent
Redox concentrations: amount-0 to 5 percent, shades-brown
Redox depletions: amount-0 to 2 percent, shades-gray
Iron-manganese concentrations: amount-0 to 2 percent, kind-nodules
EC (dS/m): 0 to 2
SAR: 0 to 4
Reaction: neutral or slightly alkaline

Bss horizon
Hue: 10YR or 2.5Y
Value: 2 to 5
Chroma: 1 or 2
Texture: clay
Clay content: 40 to 55 percent
Redox concentrations: amount-0 to 5 percent, shades-brown
Redox depletions: amount-0 to 2 percent, shades-gray
Iron-manganese concentrations: amount-0 to 2 percent, kind-nodules
EC (dS/m): 0 to 2
SAR: 0 to 8
Reaction: neutral to moderately alkaline

Bkss horizon
Hue: 10YR or 2.5Y
Value: 4 to 7
Chroma: 1 or 2
Texture: clay
Clay content: 40 to 55 percent
Redox concentrations: amount-0 to 5 percent, shades-brown
Redox depletions: amount-0 to 2 percent, shades-gray
Iron-manganese concentrations: amount-0 to 2 percent, kind-nodules
Identifiable secondary carbonates: amount-0 to 5 percent, kind-masses or nodules
EC (dS/m): 0 to 2
SAR: 2 to 8
Effervescence: none to strong
Reaction: neutral to moderately alkaline

2Bk horizon (where present)
Hue: 10YR or 2.5Y
Value: 5 to 7
Chroma: 1 to 3
Texture: fine sandy loam, loamy fine sand, sandy clay loam or clay loam,
Clay content: 15 to 30 percent
Redox concentrations: amount-0 to 5 percent, shades-brown
Redox depletions: amount-0 to 2 percent, shades-gray
Iron-manganese concentrations: amount-0 to 2 percent, kind-nodules
Identifiable secondary carbonates: amount-0 to 5 percent, kind-masses or nodules
EC (dS/m): 0 to 2
SAR: 2 to 14
Effervescence: none to strong
Reaction: slightly alkaline or moderately alkaline

COMPETING SERIES: There are no other series in the same family. Similar soils are the Banquete (TX), Eastall (OK), Hansford (TX), Ness (KS), Ranco (TX), Randall (TX), Rosston (OK), and Ustibuck (OK) series.
Banquete soils: are Udic Haplusterts and do not pond water for long periods.
Eastall soils: are in a thermic temperature regime and have colors redder than 10YR in the subsoil.
Hansford and Ness soils: are in a mesic temperature regime
Ranco, Randall, Rosston, Ustibuck soils: are in a thermic temperature regime
Ustibuck soils: are in a thermic temperature regime and have colors redder than 10YR throughout.

GEOGRAPHIC SETTING:
Parent material: clayey over loamy fluviomarine deposits of Pleistocene age
Landform: enclosed depressions on the coastal plain
Slope: 0 to 1 percent
Mean annual air temperature range: 21.1 to 23.4 degrees C (70 to 74 degrees F)
Mean annual precipitation range: 610 to 914 mm (24 to 36 in)
Precipitation Pattern: The wettest months are September and October and from April through June. The driest months are January to March.
Frost-free period: 250 to 310 days
Elevation: 9.1 to 53 m (30 to 175 ft)
Thornthwaite P-E Index: 31 to 44

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Banquete, Cranell, Calallen, and Victoria series.
Banquete soils: are in shallow depressions and swales on flats, and are moderately well drained
Cranell soils: are on flats and have a loamy surface
Calallen soils: are on flats and have a loamy surface and subsoil
Victoria soils: are on flats and are well drained

DRAINAGE AND PERMEABILITY: Poorly drained. Permeability is very slow. Runoff is negligible. The soil is ponded from a few days to a week during the spring and fall seasons in normal years. These soils are saturated in the upper part and have reducing conditions for some time during the wet times of the year.

USE AND VEGETATION: These soils are mostly used for livestock grazing and wildlife habitat. A few areas are planted to crops during dry years. Grain sorghum and cotton are the main crops. Hydrophytic vegetation dominates these soils in native areas. The ecological site is Lakebed, PE, 31-44 (R150AY641TX).

DISTRIBUTION AND EXTENT: Gulf Coast Prairies (MLRA 150A in LRR T) on the Coastal Bend of southern Texas. The series is of small extent.

MLRA OFFICE RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Welder Wildlife Refuge, San Patricio County, Texas, 1971

REMARKS: Classification changed from Vertic Haplaquolls to Ustic Epiaquerts 11/2000 based on typifying pedon description. The series geomorphic setting was revised as a result of the update of MLRA 150A and the initial soil survey of Kenedy and Kleberg counties, Texas. Originally, the series was mapped as two phases, a depressional phase and a relict drainage phase. The soils of the two geomorphic positions classify differently. The revised concept is having the Edroy series in enclosed depressions, while the relict drainage areas will be identified as the Banquete series as originally mapped in the 1965 soil survey of Nueces County, TX.
Diagnostic horizons and features recognized in this pedon are:

Mollic epipedon: 0 to 104 cm (0 to 41 in). (A, Bw, and Bss1)
Vertic features: pressure faces and slickensides 18 to 178 cm (7 to 70 in). (Bw, Bss1, Bss2, and Bkss horizons)
Aquic feature: ponding and reducing conditions in most years

ADDITIONAL DATA: none

TAXONOMIC VERSION: Keys to Soil Taxonomy, Tenth Edition, 2006