LOCATION KATY TX
Established Series
JKW-RM-AKS
07/2019
KATY SERIES
The Katy series consists of very deep, moderately well drained, moderately slow permeable soils that formed in loamy sediments derived from the Lissie Formation. These nearly level to gently sloping soils are on coastal prairies. Slope ranges from 0 to 3 percent but the majority is less than 1 percent. Mean annual temperature is about 20 degrees C (68 degrees F) and mean annual precipitation is about 1145 mm (49 in).
TAXONOMIC CLASS: Fine-loamy, siliceous, semiactive, hyperthermic Typic Paleudalfs
TYPICAL PEDON: Katy fine sandy loam-in an area of Katy-Urban land complex,0 to 1 percent slopes, in an undisturbed area (Colors are for moist soil unless otherwise stated.)
Ap--0 to 30 cm (0 to 12 in); dark grayish brown (10YR 4/2) fine sandy loam, grayish brown (10YR 5/2) dry; massive; soft, very friable; many very fine roots; common very fine and fine interstitial and tubular pores; strongly acid; gradual smooth boundary. (13 to 38 cm [5 to 15 in] thick)
E--30 to 63 cm (12 to 25 in); pale brown (10YR 6/3) fine sandy loam, very pale brown (10YR 7/3) dry; massive; soft, very friable; many very fine tubular pores; 1 percent fine prominent yellowish brown (10YR 5/8) iron accumulations with sharp boundaries lining pores; strongly acid; clear wavy boundary. (14 to 64 cm [5 to 25 in] thick)
Bt1--63 to 71 cm (25 to 28 in); yellowish brown (10YR 5/6) clay loam, brownish yellow (10YR 6/6) dry; weak medium subangular blocky structure; moderately hard, friable; common very fine roots; common very fine tubular pores; 5 percent faint yellowish brown (10YR 5/6) clay films on surfaces of peds; 3 percent fine distinct reddish yellow (7.5YR 6/8) iron accumulations on surfaces of peds and 2 percent fine prominent yellowish red (5YR 5/6) iron accumulations on surfaces of peds; moderately acid; clear smooth boundary. (thickness of the Bt1 horizon is 8 to 66 cm [20 to 26 in])
Bt2--71 to 117 cm (28 to 46 in); 60 percent yellowish brown (10YR 5/6) and 25 percent red (2.5YR 4/8) and 15 percent gray (10YR 5/1) loam, 60 percent brownish yellow (10YR 6/6) and 25 percent red (2.5YR 5/8) and 15 percent gray (10YR 6/1) dry; moderate medium subangular blocky structure; very hard, friable; common very fine roots; common very fine tubular pores; 25 percent prominent very dark gray (10YR 3/1) clay films on surfaces of peds; 1 percent fine distinct spherical black (10YR 2/1) iron-manganese concretions; slightly acid; gradual wavy boundary. (combined thickness of the Bt2, Bt3, and Bt4 horizons is 104 to 142 cm (41 to 56 in)
Bt3--117 to 163 cm (46 to 64 in); 50 percent yellowish brown (10YR 5/6) and 30 percent red (2.5YR 4/8) and 20 percent gray (10YR5/1) clay loam, 50 percent yellowish brown (10YR 5/6) and 30 percent red (2.5YR 5/8) and 20 percent gray (10YR 6/1) dry; weak coarse prismatic structure parting to moderate coarse subangular blocky structure; very hard, firm; common very fine roots between peds; few very fine tubular pores; 10 percent distinct dark gray (10YR 4/1) clay films on surfaces of peds and 5 percent prominent sand coats on vertical surfaces of peds; neutral; gradual wavy boundary.
Bt4--163 to 203 cm (64 to 84 in); 50 percent brownish yellow (10YR 6/6) and 25 percent gray (10YR 6/1) and 25 percent red (2.5YR 4/8) clay loam, 50 percent brownish yellow (10YR 6/6) and 25 percent gray (10YR 6/1) and 25 percent red (2.5YR 5/8) dry; moderate coarse prismatic structure parting to moderate coarse subangular blocky structure; very hard, very firm; few very fine roots; few very fine tubular pores; 20 percent distinct gray (10YR 5/1) clay films on surfaces of peds and 5 percent distinct sand coats on vertical surfaces of peds; neutral.
TYPE LOCATION: Fort Bend County, Texas; from the intersection of Farm Road 1093 and Farm Road 359 in Fulshear; 3.3 miles east on Farm Road 1093 to the intersection of Farm Road 1463; 0.1 mile north on Farm Road 1463; 300 feet east in an undisturbed area.
USGS topographic quadrangle: Richmond NE, TX
Latitude: 29 degrees, 41 minutes, 42.71 seconds N;
Longitude: 95 degrees, 50 minutes, 43.14 seconds W;
Datum: NAD 83
RANGE IN CHARACTERISTICS:
Soil Moisture: An udic soil moisture regime. The soil moisture control section is from 10 to 61 cm (4 to 24 in) in depth. These soils remain moist in some part of the soil moisture control section for more than 275 days in normal years, with rainfall being uniform throughout the year. Typically, March is the driest month.
Mean annual soil temperature: 22 to 23 degrees C (71.5 to 72.5 degrees F)
Depth to argillic horizon: 46 to 76 cm (18 to 30 in)
Depth to redox concentrations: 13 to 43 cm (5 to 17 in)
Depth to episaturation: 13 to 76 cm (5 to 30 in)
Thickness of the A and E horizons: 46 to 76 cm (18 to 30 in)
Particle-size control section (weighted average)
Clay content: 25 to 30 percent
Sand content: 35 to 45 percent
CEC/clay ratio: 0.25 to 0.35
A horizon
Hue: 10YR
Value: 4 or 5
Chroma: 2 or 3
Texture: fine sandy loam, very fine sandy loam, or loam
Clay content: 3 to 14 percent
Iron accumulations: amount- 0 to 3 percent, color-shades of brown (Iron accumulations are associated with pedons in rice culture.)
Reaction: very strongly acid to slightly acid (pH 5.1 to 6.5)
E horizon
Hue: 10YR
Value: 4 to 6
Chroma: 3 or 4
Texture: fine sandy loam, very fine sandy loam, or loam
Clay content: 4 to 12 percent
Iron accumulations: amount- 1 to 4 percent, color- shades of brown, red or yellow
Iron depletions: amount- 2 to 8 percent, color- shades of brown or gray (iron depletions formed during abnormally wet years)
Base saturation: 50 to 70 percent
Reaction: very strongly acid to neutral (pH 5.1 to 7.3)
Bt horizon (Upper part)
Hue: 10YR
Value: 4 to 6
Chroma: 2 to 4 (chroma of 2 is considered relict wetness)
Texture: fine sandy loam, loam, sandy clay loam, or clay loam
Clay content: 13 to 35 percent
Iron accumulations: amount- 1 to 10 percent, color- shades of brown, red, or yellow
Redox depletions: amount-0 to 5 percent, color- shades of gray (depletions are considered relict or have formed in abnormally wet years)
Base saturation: 60 to 80 percent
Reaction: strongly acid to slightly (pH 5.1 to 7.3)
Bt horizon (Lower part)
Variegated matrix
These matrix colors make up 50 to 80 percent of the horizon:
Hue: 2.5YR, 5YR, or 7.5YR
Value: 4 to 6
Chroma: 4 to 8
These colors make up 20 to 50 percent of the horizon:
Hue: 10YR
Value: 5 or 6
Chroma: 1 or 2 (These colors are considered relict wetness)
Texture: loam, sandy clay loam, clay loam, sandy clay, clay
Clay content: 25 to 45 percent
Iron accumulations: variegated matrix is comprised of medium or coarse iron accumulations in shades of brown, red, or yellow
Redox depletions: variegated matrix is comprised of fine to coarse redox depletions. In pedons without a variegated matrix: amount-0 to 35 percent, color- shades of gray (depletions are considered relict or have formed in abnormally wet years)
Base saturation: 75 to 90 percent
Reaction: strongly acid to neutral (pH 5.1 to 7.3)
COMPETING SERIES: There are no series in the same family. Similar soils are the
Cheetham,
Cyfair,
Glenwild,
Levyville, and
Wockley series.
Cheetham soils: plinthite within 152 cm (60 in) of the soil surface and have a loamy sand surface.
Cyfair soils: remain saturated without reduction for 30 cumulative days
Glenwild soils: are Hapludalfs, have a fine-silty particle-size control section, a superactive CEC to clay class, and mixed mineralogy class.
Levyville soils: superactive CEC to clay class; sandy epipedon
Wockley soils: have plinthite; have aquic conditions.
GEOGRAPHIC SETTING:
Parent material: loamy fluviomarine deposits derived from the Lissie Formation
Landscape: coastal plains
Landform: flats
Slope: 0 to 3 percent but most areas are less than 1 percent.
Precipitation Pattern: Rainfall is uniform throughout the year with slight peaks during the spring and fall months.
Mean annual precipitation: 1092 to 1219 mm (43 to 48 in)
Thornthwaite P-E Index: 56 to 68
Mean annual air temperature: 19.5 to 20.6 degrees C (67 to 69 degrees F)
Frost-free period: 271 to 300 days
Elevation: 43 to 76 m (140 to 225 ft)
GEOGRAPHICALLY ASSOCIATED SOILS:
These are the
Addicks,
Clodine,
Cyfair,
Garwood,
Gessner and
Telf series.
Garwood,
Gessner and
Telf series.
Addicks soils: are mollisols.
Clodine soils: have a coarse-loamy particle-size class, are somewhat poorly drained, and are on a lower landscape position
Cyfair soils: are somewhat poorly drained; are on a slightly lower landscape position
Garwood and
Telf soils: a fine particle-size class; have an abrupt texture change and are on a similar landscape position
Gessner soils: are poorly drained and are in depressions
DRAINAGE AND PERMEABILITY:
Drainage class: Moderately well.
Permeability class: moderately slow.
Runoff: low on 0 to 1 percent slopes and medium on 1 to 3 percent slopes.
Wetness: Seasonal water table occurs due to episaturation in the E horizon for short periods during the cool months or in periods of excess rainfall.
USE AND VEGETATION: Used for crop production, mainly rice production, and for livestock grazing. Some areas are used for growing corn and grain sorghum. Native grasses consist of little bluestem, indiangrass, big bluestem, switchgrass, crinkleawn, and Florida paspalum. A few areas near the eastern limit of the extent have pine forest encroachment and many areas have urban development.
Ecological sites assigned to phases and components of this series are listed below. Current ecological site assignments are in Web Soil Survey. Components of this series include the following ecological sites: Loamy Prairie
DISTRIBUTION AND EXTENT:
General location: Southeast Texas, mainly from the Brazos River to the San Jacinto River
Land Resource Region: T (Atlantic and Gulf Coast Lowland Forest and Crop Region)
Major Land Resource Area: 150A (Gulf Coast Prairies)
Extent: The series is of large extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Harris County, Texas, 1922.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Particle size control section: 63 to 113 cm (25 to 45 in). (Bt1 and Bt2 horizon)
Ochric epipedon: 0 to 63 cm (0 to 25 in). (A and E horizons)
Argillic horizon: 63 to 203 cm (25 to 80 in). (Bt horizons)
Iron accumulations: 30 to 203 cm (12 to 80 in). (E, Bt1, Bt2, and Bt3 horizons)
Pale feature: Many coarse redox concentrations with chroma of 6 or more and clay does not decrease by as much as 20 percent absolute from the maximum clay content within 152 cm (60 in) of the soil surface.
Additional Comments: Classification change from thermic to hyperthermic temperature regime is based on geographic distribution of the series. In January 2003, classification was changed from an Aquic to Oxyaquic subgroup. A further refinement in soil moisture classification from Oxyaquic to Typic occurred because of the update of MLRA 150A. This change was based on soil moisture monitoring data collected on soils in the area.
The assignment of the cation-exchange activity class is supported by laboratory data number S55TX-157-093 from the series type location in Fort Bend County and on Kellogg Soil Survey lab pedon number 05N0203.
ADDITIONAL DATA: National Soil Survey Laboratory soil characterization data exists on pedon 40A4455 (S55TX-157-093) from the type location in Fort Bend County, Texas. Addiitonal data available from the Kellogg Soil Survey lab on pedon numbers 05N0203 and 89P0031.
Taxonomic Version: Keys to Soil Taxonomy, Twelfth Edition, 2014
National Cooperative Soil Survey
U.S.A.