LOCATION DOSRIOS                 TX

Established Series
CKH
11/2010

DOSRIOS SERIES

The Dosrios series consist of soils that are very deep to mudstone, well drained, very slowly permeable soils, that formed in moderately saline clayey marine sediments overlying clayey residuum derived from mudstone of Tertiary age. These soils are on summits and shoulders of interfluves. Slopes range from 0 to 5 percent. Mean annual precipitation is about 544 mm (22 in) and the mean annual air temperature is about 21 degrees C (72 degrees F).

TAXONOMIC CLASS: Fine, smectitic, hyperthermic Sodic Haplusterts

TYPICAL PEDON: Dosrios clay, on a 2 percent slope in rangeland; elevation is 110 meters (360 feet). (Colors are for dry soil unless otherwise stated.)

A--0 to 21 cm (0 to 8 in); dark grayish brown (10YR 4/2), clay, black (10YR 2/1), moist; moderate fine and medium angular blocky structure; extremely hard, extremely firm; many fine and medium roots; few fine tubular pores; common pressure faces; few fine siliceous gravels; slightly effervescent; moderately alkaline; clear smooth boundary. (thickness of the A horizon ranges from 14 to 34 cm [5 to 13 in])

Bss1--21 to 44 cm (8 to 17 in); very dark gray (10YR 3/1), clay, black (10YR 2/1), moist; moderate medium and coarse angular blocky structure; extremely hard, extremely firm; common fine and medium roots; few very fine tubular pores; common prominent slickensides; few fine siliceous pebbles; strongly effervescent moderately alkaline; clear wavy boundary.

Bss2--44 to 75 cm (17 to 29 in); 80 percent light yellowish brown (10YR 6/4) and 20 percent very dark gray (10YR 3/1), clay, 80 percent dark grayish brown (10YR 4/2) and 20 percent black (10YR 2/1), moist; moderate medium and coarse angular blocky structure; extremely hard, extremely firm; common fine and medium roots; few very fine and fine tubular pores; common prominent slickensides; common snail shell fragments; few fine siliceous pebbles; strongly effervescent; moderately alkaline; clear wavy boundary. (thickness of the combined Bss horizons ranges from 35 to 70 cm [14 to 26 in])

Bkyz--75 to 138 cm (29 to 54 in); light yellowish brown (10YR 6/4) dry, sandy clay loam, pale brown (10YR 6/3), moist; moderate medium and coarse angular blocky structure; extremely hard, extremely firm; few very fine and fine roots; 4 percent fine threadlike salt masses; 1 percent fine films, soft masses, and clusters of gypsum crystals; 3 percent fine threadlike masses of calcium carbonate in cracks; violently effervescent moderately alkaline; clear wavy boundary. (thickness of the Bkyz horizon ranges from 43 to 60 cm [17 to 24 in])

2BCkyz--138 to 179 cm (54 to 70 in); 50 percent pale olive (5Y 6/4) and 50 percent light yellowish brown (10YR 6/4), silty clay, pale olive (5Y 6/4) moist; moderate medium and coarse angular blocky structure; very hard, very firm; few very fine and fine roots; 4 percent fine threadlike masses of calcium carbonate, 5 percent fine salt masses; 5 percent fine masses of gypsum crystals; strongly effervescent; moderately alkaline; abrupt smooth boundary. (thickness of the Bkyz horizon ranges from 27 to 65 cm [11 to 26 in])

2Cdyz--179 to 203 cm (70 to 79 in); pale olive (5Y 6/4), mudstone bedrock of silty clay texture, pale olive (5Y 6/4) moist; massive; 7 percent fine and medium salt masses; 7 percent masses of gypsum crystals; slightly effervescent; moderately alkaline.

TYPE LOCATION: McMullen County, Texas; from the intersection of U.S. Highway 16 and Ranch Road 791 about 11.4 miles north of Tilden in northern McMullen County; 5.7 miles east on Texas Highway 791; 800 feet west in rangeland. Caballos Creek, Texas USGS topographic quadrangle; Latitude: 28 degrees, 38 minutes, 24.6 seconds N; Longitude: 98 degrees, 27 minutes, 44.11 seconds W.; NAD 83.

RANGE IN CHARACTERISTICS:

Soil moisture: A typic-ustic moisture regime. The soil moisture control section is dry in some or all parts for more than 90 but less than 180 cumulative days in normal years. June through August and December through February are the driest months. These soils are intermittently moist in September through November and March through May.
Mean annual soil temperature: 21 to 23 degrees C (72 to 74 degrees F)
Depth to densic material: 160 to 190 cm (63 to 75 in)
Depth to gypsic materials: 112 to 184 cm (44 to 72 in)
Depth to lithologic discontinuity: 160 to 190 cm (63 to 75 in)
Depth to secondary carbonates: 52 to 83 cm (21 to 33 in)

Particle-size control section (weighted average)
Clay content: 40 to 60 percent
Calcium carbonate equivalent: 2 to 25 percent
Rock fragments: 0 to 10 percent

A horizon
Hue: 10YR
Value: 2 to 4
Chroma: 1 or 2
Texture: clay, clay loam, or the gravelly counterparts
Clay content: 38 to 55
Fragments: 0 to 25 percent siliceous pebbles
EC: 1 to 4 dS/m
SAR: 1 to 10

Bss horizons
Hue: 10YR
Value: 2 to 6
Chroma: 1 to 3
Texture: clay
Clay content: 40 to 60 percent
Fragments: 0 to 15 percent siliceous pebbles
EC: 2 to 8 dS/m
SAR: 14 to 25

Bkyz horizons
Hue: 10YR or 2.5Y
Value: 4 to 6
Chroma: 2 to 4
Texture: clay
Clay content: 40 to 60 percent
Calcium carbonate equivalent: 2 to 10
Identifiable secondary carbonates: 1 to 5 percent, very fine and fine threadlike masses
Fragments: 0 to 5 percent siliceous pebbles
Gypsum: 0 to 2 percent
EC: 8 to 16 dS/m
SAR: 14 to 25

2BCkyz horizons
Hue: 10YR to 5Y
Value: 4 to 7
Chroma: 2 to 4
Texture: clay or silty clay
Clay content: 40 to 60 percent
Calcium carbonate equivalent: 2 to 10
Identifiable secondary carbonates: 1 to 10 percent, very fine, fine, and medium threadlike masses, throughout size kind location
Fragments: 0 to 2 percent siliceous pebbles
Gypsum: 0 to 5 percent
EC: 4 to 16 dS/m
SAR: 13 to 40

2Cdyz horizon
Hue: 5YR to 5Y
Value: 4 to 8
Chroma: 1 to 4
Texture: noncemented mudstone bedrock of clay or silty clay textures
Clay content: 40 to 60 percent
Fragments: 0 to 5 percent cemented mudstone parachanners
Gypsum: 1 to 10 percent
EC: 8 to 16 dS/m
SAR: 13 to 35

COMPETING SERIES: These are the Arroyada (TX), Catarina (TX), Cotulla (TX), Coquat (TX), Duvert (TX), Lasalle (TX), Mercedes (TX), Montell (TX), Monwebb (TX), Victoria (TX), and Victine (TX) series. Similar soils are the Monteola (TX) and Tordia (TX) series.
Arroyada and Coquat soils: somewhat poorly drained; formed in Quaternary age alluvium
Catarina soils: have gypsum crystals or masses throughout; have hue yellower than 10YR at the surface
Cotulla soils: have an ochric epipedon
Duvert soils: have a paralithic contact between 51 to 102 cm (20 to 40 in) of the surface; have an ochric epipedon.
LaSalle soils: have hue redder than 10YR throughout.
Mercedes, Montell, and Monwebb soils: do not have a lithologic discontinuity; formed in Quaternary age alluvium.
Monteola soils: do not have a lithologic discontinuity; do not have sodium adsorption ratios greater than 13 within 100 cm (40 in) of the surface
Tordia soils: have densic material within 150 cm (60 in) of the soil surface
Victoria and Victine soils: do not have densic material; formed in Pleistocene age fluviomarine deposits

GEOGRAPHIC SETTING:
Parent material: clayey residuum derived from mudstone of Tertiary age
Landscape: inland dissected coastal plains
Landform: nose slopes of interfluves
Slope: 0 to 5 percent.
Mean annual air temperature range: 21 to 23 degrees C (70 to 74 degrees F).
Mean annual precipitation range: 635 to 813 mm (25 to 32 in).
Frost-free period: 240 to 300 days
Elevation: 30 to 244 m (95 to 800 ft).
Thornthwaite annual P-E indices: 30 to 44.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Campbellton (TX), Esseville (TX), Fashing (TX), Laparita (TX), and Montell (TX) series.
Campbellton soils: have an argillic horizon; are on a slightly higher landscape position.
Esseville soils: have a gypsic horizon within 100 cm (40 in) of the surface; are moderately-deep to densic material; are on a similar landscape position.
Fashing soils: are shallow to densic material; are on a slightly higher landscape position.
Laparita soils: have an argillic horizon; are on a lower landscape position.
Montell soils: do not have a lithologic discontinuity; are on a slightly lower landscape position.

DRAINAGE AND PERMEABILITY: Moderately well drained. Permeability is very slow.
Runoff is low on 0 to 1 percent slopes, medium on 1 to 3 percent slopes, high on
3 to 5 percent slopes and very high on 5 to 8 percent slopes. Water enters the
soil rapidly when it is cracked and dry and very slowly when it is moist.

USE AND VEGETATION: Used mainly for pasture and rangeland. Scattered areas are
cultivated mainly to grain sorghum, small grain and introduced grasses. Native
vegetation includes grasses such as alkali sacaton, sideoats grama, plains
bristlegrass, twoflower trichloris, tobosagrass, vine-mesquite, pinhole
bluestem, and buffalograss. Woody vegetation includes mesquite, agarita, and
pricklypear cactus. The ecological site is Rolling Blackland 18-25 PZ (083BY632TX).

DISTRIBUTION AND EXTENT: Northern and Western Rio Grande Plain, Texas; LRR I, MLRA 83A and 83B; large extent.

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

SERIES PROPOSED: McMullen County, TX, 2010

REMARKS: This series was formerly included in the Monteola series.
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: 0 to 44 cm (0 to 18 in). (A and Bss horizon).
Cambic horizon: 21 to 138 cm (8 to 55 in). (Bss1, Bss2, and Bkyz horizons).
Gypsic horizon: 138 to 203 cm (55 to 80 in). (2BCkyz and 2Cdyz horizons).
Densic material: 179 to 203 cm (70 to 80 in). (2Cdyz horizon).
Vertic feature: 21 to 138 cm (8 to 55 in). (Bss1, Bss2, and Bkyz horizons).

ADDITIONAL DATA: Particle-size analysis, salinity and sodicity test were performed at the project office on pedons S10TX3113112, S09TX3114005, S10TX3112596, S10TX3114516, and S10TX3112509.

TAXONOMIC VERSION: Keys to Soil Taxonomy, Eleventh Edition, 2010.

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National Cooperative Soil Survey
U.S.A.