LOCATION ZALCO TXEstablished Series
TAXONOMIC CLASS: Sandy, siliceous, hyperthermic Typic Udifluvents
TYPICAL PEDON: Zalco fine sand, on north-facing, convex, 0.7 percent slope in rangeland at an elevation of 15.2 m (50 ft) (Colors are for moist soils unless otherwise stated.)
A--0 to 10 cm (0 to 4 in); brown (10YR 5/3) fine sand, pale brown (10YR 6/3) dry; single grained; loose; common fine roots; moderately alkaline; clear smooth boundary. (8 to 38 cm [3 to 15 in] thick)
C1--10 to 48 cm (4 to 19 in); brown (10YR 5/3) fine sand, pale brown (10YR 6/3) dry; single grained; loose; many thin strata of fine sandy loam; few fine roots; slightly effervescent; moderately alkaline; clear smooth boundary.
C2--48 to 69 cm (19 to 27 in); grayish brown (10YR 5/2) loamy fine sand, light brownish gray (10YR 6/2) dry; massive; loose, very friable; many thin strata of fine sandy loam; slightly effervescent; moderately alkaline; clear wavy boundary.
C3--69 to 94 cm (27 to 37 in); brown (10YR 5/3) loamy fine sand, very pale brown (10YR 7/3) dry; massive; loose; very friable; few thin strata of loam and fine sandy loam; slightly effervescent; moderately alkaline; clear wavy boundary.
C4--94 to 124 cm (37 to 49 in); dark grayish brown (10YR 4/2) fine sandy loam, light brownish gray (10YR 6/2) dry; massive; loose; very friable; many thin strata of loamy fine sand; slightly effervescent; moderately alkaline; gradual smooth boundary.
C5--124 to 203 cm (49 to 80 in); brown (10YR 5/3) fine sand, pale brown (10YR 6/3) dry; single grained; loose; slightly effervescent; moderately alkaline. (combined thickness of C horizons is 140 to 196 cm [55 to 77 in])
TYPE LOCATION: Victoria County, Texas; from the intersection of U.S. Highway 77 and Farm Road 446 southwest of Victoria, 3.2 miles southwest on Farm Road 446 across Coleto Creek, 0.1 mile west along south bank of Coleto Creek and 2 feet south in rangeland. Raisin USGS Quad; Latitude: 28 degrees 43 minutes 36.7 N; Longitude: 97 degrees 4 minutes 49 seconds W. NAD 83
RANGE IN CHARACTERISTICS: Thin strata and lenses of fine sandy loam, very fine sandy loam, loam, silt loam, or clay loam are throughout the control section.
Soil Moisture: An udic soil moisture regime. The soil moisture control section is moist in some or all parts for more than 275 days in normal years.
A Horizon
Hue: 10YR
Value: 4 to 6
Chroma: 2 or 3
Texture: sand, fine sand, loamy fine sand
Effervescence: none to slight
Reaction: neutral to moderately alkaline
C Horizon
Hue: 10YR
Value: 4 to 7
Chroma: 2 to 4
Texture: sand, fine sand, loamy fine sand Some pedons have a few thin strata of gravel mainly below the control section.
Effervescence: none to slight
Reaction: neutral to moderately alkaline
COMPETING SERIES: There are no other series in this family.series. Other similar series are the Absco (WI), Bane (ID), Bruno (TN), Dinkey (MI), Fontaflora (NC), Kiomatia (TX), Moundhaven (IN), Nugent (MS), Stonehouse (KS), Whitewash (MI), Wideman (AR), Yeager (KY), and Zalla (TX) series.
Absco and
Wideman soils: mesic soil temperature regime
Bane and
Whitewash soils: frigid soil temperature regime; mixed mineralogy
Bruno soils: a thermic soil temperature regime; mixed mineralogy
Dinkey soils: frigid soil temperature regime; mixed mineralogy
Fontaflora,
Moundhaven, and
Stonehouse soils: mesic soil temperature regime; mixed mineralogy
Kiomatia soils: mixed mineralogy; hue redder than 7.5YR.
Nugent soils: thermic soil temperature regime
Yeager soils: mesic soil temperature regime; mixed mineralogy
Zalla soils: ustic soil moisture regime; mixed mineralogy
GEOGRAPHIC SETTING:
Parent material: sandy alluvium of Holocene age
Landscape: River Valley
Landform: natural levee
Slope: 0 to 1 percent
Mean annual air temperature range: 21 to 22 degrees C (70 to 72 degrees F)
Mean annual precipitation range: 864 to 1016 mm (34 to 40 in)
Precipitation Pattern: Precipitation is uniform throughout the year with slight peaks from May to June and from September to October.
Frost-free period: 260 to 300 days
Elevation: 15 to 91 m (49.2 to 300 ft)
Thornthwaite annual P-E indices: 46 to 64
GEOGRAPHICALLY ASSOCIATED SOILS: These include the Meguin and Sinton series.
Meguin and Sinton soils: mollic epipedons; more than 18 percent clay in the control section; on crevasse splay landform.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained. Permeability is rapid. Runoff is negligible.
USE AND VEGETATION: Mainly used for rangeland. Some occasionally flooded areas are in improved bermudagrass pastures. Native vegetation includes switchgrass, little bluestem, purpletop triden, and Virginia wildrye. A few hackberry, cottonwood and live oak trees are in some areas. (Ecological site name: Sandy Bottomland 35-42" Pz; Ecological site number: R150AY541TX)
DISTRIBUTION AND EXTENT: The soil is mainly along small streams in coastal areas of south Texas; MLRA 150A; LRR-T. It is of minor extent.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Victoria County, Texas; 1980.
REMARKS: This soil was formerly mapped in the Zalla series.
Diagnostic horizon and features recognized in this pedon are:
Ochric epipedon 0 to 10 cm (0 to 4 in) (A horizon)