LOCATION KRASNA TX
Established Series
SAK-JKW-AKS
07/2019
KRASNA SERIES
The Krasna series consists of very deep, moderately well drained, moderately slow permeable soils that formed in loamy sediments derived from the Beaumont Formation. These nearly level to gently sloping soils occur on coastal prairies. Slope ranges from 0 to 2 percent. Mean annual precipitation is about 1145 mm (49 in) and mean annual air temperature is about 20 degrees C (68 degrees F).
TAXONOMIC CLASS: Fine-loamy, siliceous, active, hyperthermic Typic Hapludalfs
TYPICAL PEDON: Krasna fine sandy loam, on a south facing, 0.3 percent slope in an undisturbed pasture area; elevation is 24.4 m (80 ft). (Colors are for moist soil unless otherwise stated.)
A--0 to 33 cm (0 to 13 in); brown (10YR 4/3) fine sandy loam; weak fine subangular blocky structure; very friable; many very fine roots; common very fine tubular pores; 3 percent fine distinct 10YR 4/6), moist, masses of oxidized iron with clear boundaries lining pores; slightly acid; gradual smooth boundary. (Thickness is 19 to 59 cm [8 to 23 in])
E--33 to 54 cm (13 to 21 in); yellowish brown (10YR 5/4) fine sandy loam; weak fine subangular blocky structure; very friable; common very fine roots; common very fine tubular pores; 1 percent fine distinct dark yellowish brown (10YR 3/6), moist, masses of oxidized iron with sharp boundaries lining pores, 1 percent fine ironstone nodules in matrix, and 2 percent fine distinct yellowish brown (10YR 5/8), moist, masses of oxidized iron with clear boundaries in matrix; slightly acid; clear wavy boundary. (Thickness is 21 to 32 cm [9 to 13 in])
Bt1--54 to 68 cm (21 to 27 in); grayish brown (10YR 5/2) fine sandy loam; moderate medium subangular blocky structure; friable; common very fine roots; common very fine tubular pores; 15 percent faint clay films; 3 percent fine prominent strong brown (7.5YR 4/6), moist, masses of oxidized iron with sharp boundaries lining pores and 5 percent fine prominent yellowish brown (10YR 5/8), moist, masses of oxidized iron with clear boundaries in matrix; slightly acid; gradual wavy boundary.
Bt2--68 to 106 cm (27 to 42 in); 50 percent light brownish gray (10YR 6/2) and 40 percent yellowish brown (10YR 5/8) clay loam; moderate medium angular blocky structure; very firm; common very fine roots; common very fine tubular pores; 25 percent distinct clay films; 5 percent fine prominent black (10YR 2/1), moist, iron-manganese masses with sharp boundaries in matrix and 5 percent medium prominent yellowish red (5YR 5/6), moist, masses of oxidized iron with sharp boundaries in matrix; neutral; clear wavy boundary. (combined thickness is 40 to 71 cm [16 to 28 in])
2Bt1--106 to 137 cm (42 to 54 in); 60 percent red (2.5YR 4/8) and 40 percent brown (7.5YR 5/4) clay loam; moderate medium angular blocky structure; firm; common very fine roots; common very fine tubular pores; 20 percent distinct clay films; 1 percent fine prominent black (10YR 2/1), moist, iron-manganese masses and 2 percent fine prominent(10YR 6/2), moist, iron depletions with clear boundaries in matrix; 1 percent fine and medium carbonate nodules; moderately alkaline; gradual wavy boundary.
2Bt2--137 to 174 cm (54 to 69 in); 70 percent yellowish red (5YR 5/8) and 30 percent light brown (7.5YR 6/4) loam; moderate coarse subangular blocky structure; firm; 25 percent distinct clay films; 1 percent prominent(10YR 6/2), moist, iron depletions with sharp boundaries in matrix and 1 percent black (10YR 2/1), moist, iron-manganese masses with sharp boundaries in matrix; moderately alkaline; clear wavy boundary. (Combined thickness is 78 to 118 cm [31 to 47 in])
2Bt3--174 to 203 cm (69 to 80 in); 70 percent reddish yellow (5YR 6/6) and 30 percent pink (7.5YR 7/4) sandy clay loam; weak coarse subangular blocky structure; friable; 25 percent distinct clay films; 2 percent fine prominent black (10YR 2/1), moist, manganese masses with sharp boundaries in matrix; moderately alkaline.
TYPE LOCATION:
Fort Bend County, TX; from the intersection of Farm to Market Road 360 and Williams School Road; 3.5 miles southwest on Williams School Road to Bushnell Road; 0.36 miles southeast on Bushnell Road to Moody Road; 3.7 miles southwest then northwest on Moody Road; located about 290 feet in pasture.
USGS topographic quadrangle: Kendleton, TX
Latitude: 29 degrees, 21 minutes, 31.09 seconds N
Longitude: 95 degrees, 55 minutes, 42.93 seconds W
Datum: WGS84
RANGE IN CHARACTERISTICS:
Soil Moisture: udic soil moisture regime. The soil moisture control section is 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: 21.7 to 22.2 degrees C (71 to 72 degrees F)
Particle-size control section (weighted average):
Total clay content: 29 to 34 percent
A horizon:
Hue: 10YR
Value: 4 or 5
Chroma: 2 or 3
Texture: fine sandy loam or very fine sandy loam
Total clay content: 3 to 9 percent
Sand content: 49 to 78 percent
Redox concentrations: amount-few to common; color-shades of brown
Iron-manganese concentrations: amount-common; size-fine and medium
Reaction (pH): strongly acid to slightly acid (5.1 - 6.5)
E horizon:
Hue: 10YR
Value: 5 or 6
Chroma: 3 or 4
Texture: fine sandy loam or very fine sandy loam
Total clay content: 3 to 7 percent
Sand content: 57 to 73 percent
Redox concentrations: amount-few to common; color-shades of brown and yellow;
Reaction (pH): slightly acid to neutral (6.1 - 7.3)
Bt horizon:
Hue: 2.5Y to 7.5YR
Value: 4 to 6
Chroma: 2 to 8
Texture: fine sandy loam, sandy clay loam, clay loam, sandy clay
Total clay content: 18 to 36 percent
Sand content: 36 to 72 percent
Redox concentrations: amount-few to many; color-shades of brown, yellow and red;
Iron-manganese concentrations: amount-few to common;
Reaction (pH): very strongly acid to neutral (4.5 - 7.3)
2Bt horizon:
Hue: 2.5YR to 10YR
Value: 4 to 7
Chroma: 2 to 8
Texture: loamy fine sand, fine sandy loam, very fine sandy loam, loam, sandy clay loam, clay loam
Total clay content: 11 to 34 percent
Sand content: 26 to 82 percent
Redox concentrations: amount-few to many; color-shades of red and brown
Redox depletions: amount-few; color-shades of gray
Iron-manganese concentrations: amount-few to common
Reaction (pH): very strongly acid to moderately alkaline (4.5 - 8.4)
COMPETING SERIES:
These are the no series in the same family. Similar soils are
Alto,
Austonio,
Chesterville,
Fulshear,
Gaphill,
Katy, and
Vaughn series.
Alto soils: in a thermic temperature regime; are underlain with glauconitic material
Austonio soils: in a thermic temperature regime; have a 2C layer starting at 173 cm (68 in) below the surface
Chesterville soils: have a superactive activity class; are well drained
Fulshear soils: in a thermic temperature regime; are well drained; do not have a lithologic discontinuity
Gaphill soils: in a mesic temperature regime; in a coarse-loamy family
Vaughn soils: in a thermic temperature regime; in a coarse-loamy family; are well drained
GEOGRAPHIC SETTING:
Parent material: loamy fluviomarine deposits derived from igneous, metamorphic and sedimentary rock
Landscape: flat coastal plains
Landform: flats
Slope: 0 to 2 percent
Precipitation Pattern: Rainfall is uniform throughout the year with slight peaks during the spring and fall months
Mean annual precipitation: 1092 to 1245 mm (43 to 49 in)
Thornthwaite P-E Index: 62 to 70
Mean annual air temperature: 19.5 to 20.6 degrees C (67 to 69 degrees F)
Frost-free period: 270 to 285 days
Elevation: 3.7 to 49 m (12 to 150 ft)
GEOGRAPHICALLY ASSOCIATED SOILS:
These are the
Edna,
Kenney, and
Midfield series.
Edna soils: have a fine control section and are somewhat poorly drained
Kenney soils: are grossarenic; do not have a decrease in clay with depth and occur on terraces
Midfield soils: have a fine control section
DRAINAGE AND PERMEABILITY:
Drainage class: moderately well
Permeability class: moderately slow
Runoff: negligible on 0 to 2 percent slopes
Seasonal water table: 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 mainly for cropland and pastureland. A few areas are in rangeland. Native vegetation includes bluestems and paspalums.
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: Northern Loamy Prairie
DISTRIBUTION AND EXTENT:
General area: Texas coastal plain
Land Resource Region: T, Atlantic and Gulf Coast Lowland Forest and Crop Region
Major Land Resource Area: 150A (Gulf Coast Prairies)
Extent: small
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Fort Bend County, Texas, 2019. The name is the historical name given to the Wallis area by Czech immigrants that settled in the area.
REMARKS: The series was formerly included in the Katy series. The series was separated based on its location on the Beaumont Formation of Fort Bend and Austin Counties.
Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: 54 to 104 cm (21 to 41 in) (Bt1 and Bt2 horizons)
Ochric epipedon: 0 to 54 cm (0 to 21in) (A and E horizons)
Argillic horizon: 54 to 203 cm (21 to 80in) (Bt and 2Bt horizons)
Lithologic discontinuity: 106 to 203 cm (42 to 80 in) (2Bt horizons)
Additional Comments: The lithologic discontinuity was determined by the ratio of very fine sand to fine sand which is markedly different than the overlying horizons and coincides where the horizon color is 5YR or redder and the presence of mica flakes. The reddish subsoil and mica flakes are considered to be a marker of Colorado and Brazos River sediments.
ADDITIONAL DATA: Soil survey office lab data available on the typical pedon (NASIS user site id of S2019TX1573074)
TAXONOMIC VERSION: Keys to Soil Taxonomy, Twelfth Edition, 2014
National Cooperative Soil Survey
U.S.A.