LOCATION KRUM TX
Established Series
Rev. CLN-RMR-RM
02/2018
KRUM SERIES
The Krum series consists of very deep to clayey alluvium, well drained soils that formed in calcareous clayey alluvium derived from interbedded chalk and marl. These nearly level to moderately sloping soils are on risers and treads of stream terraces on river valleys and dissected plains. Slopes range from 0 to 8 percent. Mean annual precipitation is about 873.8 mm (34.4 in) and the mean annual air temperature is about 20.4 degrees C (68.7 degrees F).
TAXONOMIC CLASS: Fine, smectitic, thermic Udertic Haplustolls
TYPICAL PEDON: Krum silty clay--in a cultivated field. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 15 cm (0 to 6 in); dark grayish brown (10YR 4/2) silty clay, very dark brown (7.5YR 2/2) moist; moderate fine subangular blocky and moderate medium granular structure; hard, firm, sticky, plastic; common roots; few fine pores; few strongly cemented calcium carbonate concretions up to 5 mm in diameter; few white flakes of calcium carbonate, some of which are fragments of snail shells; calcareous; moderately alkaline; clear smooth boundary. (0 to 20 cm [0 to 8 in] thick)
A--15 to 66 cm (6 to 26 in); very dark grayish brown (10YR 3/2) silty clay, very dark brown (10YR 2/2) moist; moderate very fine subangular blocky and very fine angular blocky structure; hard, firm, sticky, plastic; few very fine weakly cemented calcium carbonate concretions; few very fine whitish soft masses of calcium carbonate in the lower part; common roots; many fine pores; calcareous; moderately alkaline; gradual wavy boundary. (30 to 91 cm [12 to 36 in] thick)
Bw--66 to 112 cm (26 to 44 in); brown (7.5YR 5/4) silty clay, brown (7.5YR 4/4) moist; moderate medium angular blocky structure; peds have shiny pressure faces; hard, very firm, sticky, plastic; darker soil from horizon above extends to bottom of this layer along partially sealed cracks; few fine roots; common fine pores; less than 1 percent weakly to strongly cemented calcium carbonate concretions and fine powdery masses of calcium carbonate; calcareous; moderately alkaline; gradual wavy boundary. (46 to 127 cm [18 to 50 in] thick)
Bk1--112 to 157 cm (44 to 62 in); reddish yellow (7.5YR 6/6) silty clay, strong brown (7.5YR 5/6) moist; weak coarse angular blocky structure; hard, firm, sticky, plastic; few fine roots; 5 percent calcium carbonate weakly to strongly cemented concretions and a few powdery masses; calcareous; moderately alkaline; diffuse wavy boundary. (36 to 81 cm [14 to 32 in] thick)
Bk2--157 to 183 cm (62 to 72 in); reddish yellow (7.5YR 6/6) silty clay, strong brown (7.5YR 5/6) moist; weak coarse subangular blocky structure; hard, firm, sticky, plastic; 2 percent weakly and strongly cemented concretions and powdery masses; calcareous; moderately alkaline.
TYPE LOCATION: Williamson County, Texas; From the intersection of State Highway 79 and Farm To Market Road 1660 in Hutto, Texas; 2.7 miles south on Farm To Market Road 1660; 200 ft south in a cultivated field.
USGS topographic quadrangle: Hutto, TX;
Latitude: 30 degrees, 30 minutes, 45.68 seconds North;
Longitude: 97 degrees, 31 minutes, 53.29 seconds West.
Datum: WGS84
RANGE IN CHARACTERISTICS:
Solum depth: 102 to greater than 203 cm (40 to greater than 80 in)
Soil Moisture: An ustic soil moisture regime that borders on udic. The soil moisture control section is dry in some or all parts for 90 or more cumulative days and moist, in some part, either for more than 180 cumulative days per year, or for 90 or more consecutive days in normal years.
Soil temperature: 15 to 22 degrees C (59 to 72 degrees F)
Thickness of mollic epipedon: 36 to 91 cm (14 to 36 in)
Thickness of cambic horizon: 112 to 167 cm (44 to 65 in)
Other features: These soils, when dry, have cracks 1.2 to 3.6 cm (0.4 to 1.2 in) wide that extend from the surface to depths of about 61 to 122 cm (24 to 48 in)
Particle-size control section:
Clay content: 40 to 60 percent
Rock fragments: amount-0 to 10 percent; kind-limestone; shape-nonflat; size-gravels
Calcium carbonate equivalent: 15 to 30 percent
Identifiable secondary carbonates: amount-0 to 5 percent; kind-carbonate masses and concretions; size-fine or medium
A horizons
Hue: 7.5YR or 10YR
Value: 3 to 5 dry, 2 to 3 moist
Chroma: 1 to 3 dry, 2 to 3 moist
Texture: clay, silty clay, clay loam, or silty clay loam, with the loamy textures occurring at depths of less than 30 cm (12 in) or in an Ap horizon.
Reaction: moderately alkaline or mildly alkaline, and the upper 25 cm (10 in) is noncalcareous in some pedons.
Bw horizon
Hue: 5YR to 10YR
Value: 4 to 6, dry or moist
Chroma: 2 to 4, dry or moist
Free carbonates: amount-0 to 10 percent, size-fine, kind-carbonate concretions and carbonate masses
Bk horizons
Hue: 5YR to 10YR
Value: 6 dry, 5 moist
Chroma: 3 to 6, dry or moist
Texture: silty clay loam, silty clay, or clay
Identifiable secondary carbonates: amount- 2 to 20 percent, size-fine or medium, kind-carbonate concretions or masses
Calcium carbonate equivalent: 20 to 50 percent
COMPETING SERIES:
Garvin and
Matoy soils are in the same family. Similar soils include
Bippus,
Denton,
Knippa,
Lewisville,
Miller,
Moreland,
Pledger,
Raymondville,
Rioconcho,
Rowena, and
Volente series.
Garvin soils: have a subsoil with hues of 5YR to 7.5YR and occur on floodplains.
Matoy soils: have limestone bedrock at a depth less than 100 cm (40 in).
Bippus,
Lewisville, and
Volente soils: when dry, do not have cracks as wide as 1.2 cm (0.4 in). In addition, Lewisville soils have mollic epipedons less than 51 cm (20 in) thick.
Denton soils: are less than 152 cm (60 in) deep over limestone.
Knippa and
Rowena soils: have calcic horizons at depth of less than 102 cm (40 in)
Matoy soils: have limestone bedrock at depths of 51 to 102 cm (20 to 40 in).
Miller,
Moreland,
Pledger, and
Rioconcho soils: have an irregular decrease in organic matter as depth increases.
Raymondville soils: have average annual temperatures of more than 22.2 degrees C (72 degrees F).
GEOGRAPHIC SETTING:
Parent material: calcareous clayey alluvium derived from interbedded chalk and marl
Landscape: river valleys and dissected plains
Landform: nearly level risers and treads of stream terraces
Slope: 0 to 8 percent
Mean annual air temperature: 17.2 to 21.1 degrees C (63 to 70 degrees F)
Mean annual precipitation: 610 to 948 mm (24 to 37.3 in)
Frost-free period: 210 to 266 days
Elevation: 105 to 442 m (344.5 to 1450 ft)
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Denton,
Lewisville, and
Volente series and
Branyon,
Crawford,
Frio, and
Tarrant series.
Denton,
Lewisville, and
Volente soils: occur on similar surfaces.
Branyon,
Crawford, and
Tarrant soils: occur at higher elevations. In addition, Branyon and Crawford soils have intersecting slickensides. Tarrant soils have sola less than 51 cm (20 in) thick over limestone and they contain more than 35 percent coarse fragments.
Frio soils: occur at lower elevations in flood plains and lack vertic properties.
DRAINAGE AND PERMEABILITY:
Drainage class: Well.
Permeability class:Moderately slow.
Runoff: low on slopes less than 1 percent; medium on 1 to 5 percent slopes and high on slopes 5 to 8 percent.
USE AND VEGETATION: About two-thirds is cropped to corn, cotton, grain sorghum, and small grains. The remainder is used for rangeland. The vegetation is tall and mid-grasses, and a few clumps of live oak and other hardwood trees.
DISTRIBUTION AND EXTENT: Texas and possibly Oklahoma. This soil occurs primarily in the Northern Texas Blackland Prairies (MLRA 86A), Grand Prairies (MLRA 85), and the Edwards Plateau, Eastern Part (MLRA 81C). The series is of large extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE:Temple, Texas
SERIES ESTABLISHED: McLennan County, Texas; 1943.
REMARKS: This series now includes some soils formerly included in the Lewisville series.
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: 0 to 66 (0 to 26 in) (Ap and A horizons)
Cambic horizon: 66 to 112 cm (26 to 44 in) (Bw horizon)
Calcic horizon: 112 to 157 cm (44 to 62 in) (Bk1 horizon)
ADDITIONAL DATA: Lincoln Lab Data Sample Nos. 72L438 and 72L439; SSIR-30-S57TX-18-90.
Taxonomic Version: Keys to Soil Taxonomy, Twelfth Edition, 2014
National Cooperative Soil Survey
U.S.A.