LOCATION MOHAT                   TX

Established Series
Rev. SEB-SAK-RM
05/2014

MOHAT SERIES

The Mohat series consists of very deep, well drained, moderately rapidly permeable soils that formed in calcareous loamy alluvium. These nearly level soils occur on flood plains, mainly along the Colorado and Brazos Rivers. Slopes range from 0 to 1 percent. Mean annual precipitation is about 1194 mm (47 in), and mean annual air temperature is about 21 degrees C (70 degrees F).

TAXONOMIC CLASS: Coarse-silty, mixed, superactive, calcareous, hyperthermic Typic Udifluvents

TYPICAL PEDON: Mohat loam-0 to 1 percent slope in cropland at an elevation of 7.6 m (25 ft). (Colors are for moist soil unless otherwise stated).

Ap--0 to 20 cm (0 to 8 in); brown (10YR 4/3) loam, pale brown (10YR 6/3) dry; moderate fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine pores; few very fine mica flakes; violently effervescent; moderately alkaline; clear wavy boundary. (Thickness is 15 to 28 cm [6 to 11 in].)

Bw1--20 to 41 cm (8 to 16 in); yellowish brown (10YR 5/4) very fine sandy loam, very pale brown (10YR 7/3) dry; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine pores; few very fine mica flakes; violently effervescent; moderately alkaline; gradual wavy boundary.

Bw2--41 to 74 cm (16 to 29 in); yellowish brown (10YR 5/4) very fine sandy loam, very pale brown (10YR 7/3) dry; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many fine and fine pores; few very fine mica flakes; violently effervescent; moderately alkaline; gradual wavy boundary.

Bw3--74 to 102 cm (29 to 40 in); yellowish brown (10YR 5/4) loam, very pale brown (10YR 7/3) dry; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine pores; few very fine mica flakes; violently effervescent; slightly alkaline; gradual wavy boundary.

Bw4--102 to 122 cm (40 to 48 in); yellowish brown (10YR 5/4) loam, very pale brown (10YR 7/3); weak coarse subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine pores; few very fine mica flakes; violently effervescent; slightly alkaline; gradual wavy boundary.

Bw5--122 to 147 cm (48 to 58 in); brown (10YR 5/3) very fine sandy loam, very pale brown (10YR 7/3) dry; weak coarse subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine pores; few fine prominent red (2.5YR 4/6) masses of iron accumulation with sharp boundaries; slightly alkaline; gradual wavy boundary. (The combined thickness of Bw horizons is 20 to 183 cm(8 to 72 in)

Bw6--147 to 203 cm (58 to 80 in); yellowish brown (10YR 5/4) very fine sandy loam, very pale brown (10YR 7/4) dry; massive; soft, very friable, nonsticky and nonplastic; common very fine mica flakes; violently effervescent; moderately alkaline.

TYPE LOCATION: Colorado County, TX; From the intersection of Texas State Highway 71 and Farm Road 950 in Garwood, 5.5 miles east on Farm Road 950, 200 ft north on field road across drain, and 700 ft southwest in cropland. USGS topographic quad: Bonus; Latitude: 29 degrees, 29 minutes, 46 seconds N; Longitude: 96 degrees, 20 minutes, 23 seconds W; Datum: NAD 83

RANGE IN CHARACTERISTICS:
Soil Moisture: Udic soil moisture regime. The soil moisture control section is not dry in any part for as long as 90 cumulative days in normal years.
Mean annual soil temperature: 21.7 to 22.2 degrees C (71 to 72 degrees F)
Electrical conductivity (dS/m): 0 to 2
Effervescence: slight to violent
Reaction: slightly alkaline or moderately alkaline

Ap Horizon
Hue: 7.5YR or 10YR
Value: 4 or 5
Chroma: 3 or 4
Texture: fine sandy loam, very fine sandy loam, or loam
Clay content: 8 to 18 percent
Sand content: 42 to 67 percent
Electrical conductivity: 0 to 2
Reaction: slightly alkaline or moderately alkaline

Bw Horizon
Upper part
Hue: 5YR to 10YR
Value: 5 to 7
Chroma: 3 to 6
Texture: very fine sandy loam, loam, silt loam
Clay content: 8 to 19 percent
Sand content: 47 to 67 percent
Electrical conductivity: 0 to 2
Reaction: slightly alkaline or moderately alkaline

Bw Horizon
Lower part
Hue: 5YR to 10YR
Value: 5 to 7
Chroma: 2 to 4
Texture: very fine sandy loam, loam, sandy clay loam
Clay content: 9 to 21 percent
Sand content: 30 to 62 percent
Electrical conductivity: 0 to 2
Reaction: slightly alkaline to moderately alkaline

COMPETING SERIES: There are no competing series in the same family. Similar soils are the Caruthersville, Caloosa, Jules, Severn, Zeandale series.
Caruthersville and Severn soils: are in the thermic temperature regime
Caloosa soils: has a sandy over clayey particle size class and has a nonacid reaction class
Jules and Zeandale soils: are in the mesic temperature regime

GEOGRAPHIC SETTING:
Parent material: stratified, calcareous, loamy alluvium derived from igneous, metamorphic and sedimentary rock mainly along the Colorado and Brazos River flood plain system.
Landscape: coastal plains
Landform: flood plain
Slope: 0 to 1 percent
Mean annual precipitation: 1092 to 1397 mm (43 to 55 in)
Thornthwaite P-E Index: 52 to 62
Mean annual air temperature: 19.5 to 21.7 degrees C (67 to 71 degrees F)
Frost-free period: 271 to 365 days
Elevation: 1.5 to 52 m (5 to 170 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These soils include Brazoria, Clemville, and Norwood series.
Brazoria soils: are clayey and are on slightly lower nearly level positions
Norwood and Clemville soils: are on similar positions and are adjacent to areas of Mohat soils

DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderately rapid. Runoff is negligible. The soil is rarely flooded with flooding occurring less than 5 times within a 100 year period.

USE AND VEGETATION: Most areas are used for cropland, pasture or orchards. Crops grown are corn, cotton, sorghum, small grains, and peanuts. Pasture areas are mainly improved bermudagrasses. Native vegetation consist of mid and tall prairies grasses. Trees include pecan, elm, hackberry, cottonwood, and live oak. The ecological Site is Loamy Bottomland 25-44" PZ (R150AY534TX).

DISTRIBUTION AND EXTENT: Mainly along the Colorado River in Southeastern Texas. Land Resource Region T; MLRA 150A; The series is of moderate extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Colorado County, Texas; 1997. The Mohat series is named after the former community of Mohat located in the southeastern part of Colorado County.

REMARKS: These soils were formerly included in the Coarsewood and Yahola series.

Diagnostic horizons and feature recognized in this pedon are:

Ochric epipedon - 0 to 20 cm (0 to 8 in). (Ap horizon)

Bw Horizon - 20 to 203 cm (8 to 80 in) has soil structure, but it does not meet the requirements for a cambic. There is no evidence of removal of carbonates. (Bw1, Bw2, Bw3, Bw4, Bw5, and Bw6 horizons)

Fluventic Property - There is irregular distribution of organic carbon and stratification is present.

ADDITIONAL DATA: None

Taxonomic Version: Keys to Soil Taxonomy, Eleventh Edition, 2010.

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National Cooperative Soil Survey
U.S.A.