LOCATION KUY TX

Established Series
Rev. WLM-JKW-RM
08/2018

KUY SERIES

The Kuy series consists of very deep, somewhat excessively drained, moderately rapid permeable soils that formed in sandy and loamy alluvial sediments of Pleistocene age. These nearly level to gently sloping soils are on stream terraces. Slope ranges from 0 to 5 percent. Mean annual precipitation is about 1041 mm (41 in) and the mean annual air temperature is about 21 degrees C (70 degrees F).

TAXONOMIC CLASS: Loamy, siliceous, active, hyperthermic Grossarenic Paleudalfs

TYPICAL PEDON: Kuy sand-- on a northwest-facing, convex, 0.6 percent slope in rangeland at an elevation of 34 m (110 ft). (Colors are for moist soil unless otherwise stated.)

A--0 to 18 cm (0 to 7 in); brown (10YR 4/3) sand, pale brown (10YR 6/3) dry; single grain; loose; common fine and few medium roots; slightly acid; gradual smooth boundary.

E1--18 to 69 cm (7 to 27 in); light gray (10YR 7/2) sand, very pale brown (10YR 8/2) dry; single grain; loose; few fine and medium roots; slightly acid; gradual smooth boundary.

E2--69 to 132 cm (27 to 52 in); light gray (10YR 7/2) sand, very pale brown (10YR 8/2) dry; single grain; loose; few fine and medium roots; common faint yellowish brown (10YR 5/4) lamella in lower 30 cm (12 in); slightly acid; clear wavy boundary. (Combined thickness of A and E horizons is 101 to 191 cm [40 to 75 in])

Bt1--132 to 150 cm (52 to 59 in); yellowish brown (10YR 5/6) sandy loam, yellow (10YR 7/6) dry; weak fine subangular blocky structure; hard, friable; few fine roots; few fine pores; few patchy clay films; a laminar cap occurs in the upper 5 cm (2 in) of this horizon and is comprised of about 10 to 15 percent by volume of skeletans of light gray (10YR 7/2) fine sand and silt; many coarse prominent strong brown (7.5YR 5/8) masses of oxidized iron with sharp boundaries in matrix surrounding iron concentrations, few fine prominent red (2.5YR 4/8) masses of oxidized iron with sharp boundaries in matrix; slightly acid. (Thickness of the Bt horizon is 0 to 38 cm [0 to 15 in])

Bt2--150 to 203 cm (59 to 80 in); light brownish gray (2.5Y 6/2) clay loam; light gray (2.5Y 7/2) dry; moderate very fine angular blocky structure; very hard, very firm; few fine roots; common pressure faces; many medium and coarse prominent red (2.5YR 5/6) masses of oxidized iron with sharp boundaries in matrix; moderately acid.

TYPE LOCATION: Jackson County, Texas; from the intersection of U.S. Highway 59 and Farm road 822 in Edna, 9.6 miles northwest on Farm Road 822, 0.7 mile southwest and 4.3 miles northwest on Robinson Ranch Road to a ranch road south of Chicolete Creek, 0.45 mile southwest on ranch road, 100 ft north in rangeland.
USGS Topographic Quad: Navidad, TX
Latitude: 29 degrees 05 minutes 18.9 seconds N
Longitude: 96 degrees 50 seconds 01.1 seconds W
Datum: NAD 83

RANGE IN CHARACTERISTICS:
Solum thickness is more than 203 cm (80 in).
Some pedons contain a few rounded siliceous pebbles.
Dark concretions 2 to 6 mm in diameter range from none to a few throughout.

Soil Moisture: An udic soil moisture regime. The soil moisture control section is dry in some or all parts for less than 90 days in normal years. July through August are the driest months, while September through June are the wettest.

Particle-size control section (weighted average)
Clay content: 20 to 30 percent

A Horizon:
Hue: 10YR
Value: 4 to 6
Chroma: 2 to 4
Texture: sand, fine sand, loamy sand or loamy fine sand
Reaction: very strongly acid to neutral

E Horizon:
Hue: 10YR
Value: 5 to 8
Chroma: 2 to 4
Texture: sand, fine sand, loamy sand or loamy fine sand
Lamellae: location-lower 46 cm (18 in), where present, contrast-faint
Redox concentrations: amount-none or few, shades-brown or yellow
Reaction: very strongly acid to neutral

Bt Horizon:
Hue: 7.5YR or 10YR
Value: 5 to 7
Chroma: 1 to 8 (pedons with chroma greater than 2 have a variegated matrix in shades of gray, brown, yellow, and red)
Texture: sandy loam, fine sandy loam, sandy clay loam or clay loam
Clay content: 18 to 35 percent
Redox concentrations: amount-common or many, shades-brown, yellow, red
Redox depletions: amount-none to common, shades-gray
Reaction: very strongly acid to slightly acid

BC and 2C Horizon (where present and typically below 203 cm [80 in]):
Hue: alternating layers of 7.5YR or 10YR
Value: 5 to 7
Chroma: 1 or 2
Texture: sand to clay
Reaction: very strongly acid to slightly acid

COMPETING SERIES: These include the Cadillac (FL), Kenney (TX), and Portalto (TX) series. Similar soils are the Catilla (TX), Hitilo (TX), Landman (TX), Padina (TX), and Pickton (TX) series.
Cadillac soils: slightly acid to moderately alkaline in the argillic horizon; underlain by limestone; receive higher annual rainfall.
Kenney soils: argillic horizon with hue redder than 7.5YR; well drained
Portalto soils: water table at depths of 1.5 to 2.0 m (5 to 7 ft); at elevations mostly less than 4.6 m (15 ft); are subject to storm-surge tidal flooding during tropical storms.
Catilla and Padina soils: thermic soil temperature regime; ustic moisture regime.
Hitilo soils: an ustic moisture regime.
Landman soils: thermic soil temperature regime; contain plinthite
Pickton soils: thermic soil temperature regime; well drained

GEOGRAPHIC SETTING:
Parent material: sandy and loamy alluvial sediments of Pleistocene age
Landscape: coastal plain
Landform: stream terrace
Slope: 0 to 2 percent, but ranges to 5 percent along drainage ways
Mean annual air temperature: 21 to 22 degrees C (70 to 72 degrees F)
Mean annual precipitation: 864 to 1194 mm (34 to 47 in)
Precipitation Pattern: Rainfall is fairly consistent throughout the year with slight peaks from May through June and September through October.
Frost-free period: 260 to 300 days
Elevation: 23 to 91 m (75 to 295 ft)
Thornthwaite annual P-E indices: 46 to 64

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Fordtran (TX), Rupley (TX), and Telferner (TX) series.
Fordtran and Telferner soils: clayey control sections; on ancient meander ridges.
Rupley soils: sandy throughout; on a slightly higher position on a similar landform.

DRAINAGE AND PERMEABILITY:
Drainage class: Somewhat excessively
Permeability class: moderately rapid.
Runoff: negligible on slopes less than 1 percent, very low on 1 to 5 percent slopes.
Wetness: soils are saturated in the eluvial horizon above the argillic horizon for periods less than two weeks during the winter months.

USE AND VEGETATION: Used mainly for rangeland. Native vegetation includes grasses such as little bluestem, purpletop, Indiangrass, brownseed paspalum, with an overstory of woody species such as live oak, blackjack oak and post oak.

DISTRIBUTION AND EXTENT: Coastal Prairie of Texas; LRR T, MLRA 150A.The series is of moderate extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Victoria County, Texas, 1980.

REMARKS: Base saturation by Hatch Kit: 55 percent; CEC 9 meq. Laboratory data indicates the weighted average CEC/clay ratio is 0.6 (superactive). This series is placed in the active cation exchange activity class based on geographically associated soils (Milby).

Diagnostic horizons and features recognized in this pedon are:
Grossarenic feature: 0 to 132 cm (0 to 52 in) thick (A and E horizons)
Ochric epipedon: 0 to 18 cm (0 to 7 in) (A horizon)
Argillic horizon: 132 to 203 cm (52 to 80 in) (Bt1 and Bt2horizons)
Redoximorphic features: 132 to 203 cm (52 to 80 in)

ADDITIONAL DATA: NSSL data, sample Nos. 82P4455-4463, Jackson County, Texas.

Taxonomic Version: Keys to Soil Taxonomy, Twelfth Edition, 2014

National Cooperative Soil Survey
U.S.A.