LOCATION MOGLIA TX
Established Series
WJG-JAG- RM
08/2018
MOGLIA SERIES
The Moglia series consists of very deep, well drained, moderately slowly permeable soils that formed in calcareous, saline, loamy residuum weathered from mudstone. Slope ranges from 1 to 5 percent. Mean annual temperature is about 22 degrees C (73 degrees F) and mean annual precipitation is about 559 mm (22 in).
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, hyperthermic Aridic Calciustepts
TYPICAL PEDON: Moglia clay loam, on a southwest facing 2 percent slope in rangeland; elevation is 180 m (590 ft). (Colors are for dry soil unless otherwise stated.)
A--0 to 18 cm (0 to 7 in); grayish brown (10YR 5/2) clay loam, dark grayish brown (10YR 4/2) moist; weak fine subangular blocky structure parting to weak fine granular; hard, firm, sticky and plastic; many fine and medium roots; few fine pores; 6 percent calcium carbonate equivalent; strongly effervescent; moderately alkaline; clear wavy boundary. (13 to 38 cm [5 to 15 in] thick)
Bkz--18 to 53 cm (7 to 21 in); pale brown (10YR 6/3) clay loam, brown (10YR 5/3) moist; moderate medium angular blocky structure; very hard, firm, sticky and plastic; common fine roots in upper part, few fine roots below; few fine pores; 2 percent films and threads of calcium carbonate; few siliceous pebbles; 15 percent calcium carbonate equivalent; Sodium Adsorption Ratio (SAR) of 8; violently effervescent; slightly saline; slightly alkaline; clear wavy boundary.
Bknz--53 to 76 cm (21 to 30 in); very pale brown (10YR 7/4) clay loam, yellowish brown (10YR 5/4) moist; weak medium subangular blocky structure; slightly hard, friable, sticky and plastic; few fine roots; few fine pores; 5 percent films of calcium carbonate; 16 percent calcium carbonate equivalent, Sodium Adsorption Ratio (SAR) of 30; violently effervescent; slightly saline; slightly alkaline; clear wavy boundary. (Combined thickness of the Bk horizon is 20 to 76 cm [8 to 30 in])
2Bknz--76 to 107 cm (30 to 42 in); pink (7.5YR 7/4) loam, light brown (7.5YR 6/4) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; few fine roots in upper part; 5 percent films of calcium carbonate; 15 percent calcium carbonate equivalent; Sodium Adsorption Ratio (SAR) of 37; violently effervescent; moderately saline; slightly alkaline; clear wavy boundary.
2Bknyz--107 to 137 cm (42 to 54 in); pink (7.5YR 8/4) loam, pink (7.5YR 7/4) moist; weak fine subangular blocky structure; slightly hard, very friable, sticky and slightly plastic; 3 percent films, threads and masses of calcium carbonate; 8 percent masses and crystals of gypsum; 8 percent calcium carbonate equivalent; Sodium Adsorption Ratio (SAR) of 17; violently effervescent; moderately saline; slightly alkaline; clear wavy boundary. (Combined thickness of the 2Bknz horizons is 30 to 61 cm [12 to 24 in] thick)
3Bknyz--137 to 157 cm (54 to 62 in); pink (7.5YR 7/4) clay loam, light brown (7.5YR 6/4) moist; weak fine subangular blocky structure; very hard, firm, sticky and plastic; 3 percent threads, films, and masses of calcium carbonate; 15 percent threads, films, masses, and crystals of gypsum and other salts; 7 percent calcium carbonate equivalent; Sodium Adsorption Ratio (SAR) of 19; violently effervescent; moderately saline; slightly alkaline.
TYPE LOCATION: Webb County, Texas; from intersection of U.S. Highway 59 and Interstate Highway 35 in Laredo, 22.05 miles east on U.S. 59, 50 feet south of fence in rangeland.
USGS topographic quad: Piedra Parada Tank, TX;
Latitude: 27 degrees, 39 minutes, 3 minutes N.;
Longitude: 99 degrees, 10 minutes, 27 seconds W.;
Datum: NAD 83.
RANGE IN CHARACTERISTICS:
Soil Moisture: An ustic soil moisture regime bordering on aridic.
The soil moisture control section remains moist in some or all parts for less than 90 consecutive days in normal years.
The soil is driest during the months of June through August and December through February.
These soils are intermittently moist in September through November and March through May.
Solum thickness: more than 203 cm (80 in)
Mean annual soil temperature: 23 to 24 degrees C (74 to 76 degrees F)
Depth to calcic horizon: 13 to 99 cm (5 to 39 in). The calcic horizon has a calcium carbonate equivalent of 5 to 15 percent more than the underlying material.
Depth to gypsic horizon: 102 to 203 cm (40 to 80 in)
Particle-size control section (weighted average)
Total clay content: 25 to 45 percent
Silicate clay content: ranges between 20 to 35 percent. The majority of pedons average between 27 and 35 percent silicate clay content.
Coarse Fragments: 0 to 10 percent
Cation Exchange Capacity/clay ratio: 0.60 to 0.90
A horizon
Hue: 10YR or 2.5Y
Value: 5 or 6
Chroma: 2 to 4
Texture: sandy clay loam or clay loam
Total clay content: 20 to 40 percent
Silicate clay content; 20 to 35 percent
Coarse fragments: 0 to 10 percent siliceous
Base saturation: 100 percent
Calcium carbonate equivalent: 2 to 10 percent
Electrical Conductivity (dS/m): 0 to 2
Gypsum: 0 to 1 percent
Sodium Adsorption Ratio: 0 to 5
Effervescence: very slightly or slightly effervescent
Reaction: slightly alkaline or moderately alkaline
Bk horizon
Hue: 7.5YR, 10YR or 2.5Y
Value: 5 to 7
Chroma: 2 to 4
Texture: clay loam or clay
Total clay content: 30 to 45 percent
Silicate clay content: 25 to 35 percent
Coarse fragments: 0 to 10 percent siliceous
Base saturation: 100 percent
Calcium carbonate equivalent: 5 to 25 percent
Identifiable secondary carbonate: 5 to 20 percent, fine and medium, films, threads, masses, throughout
Electrical Conductivity (dS/m): 2 to 8. The electrical conductivity decreases with depth in most pedons, but is more than 4 in all subsoil horizons below 64 cm (25 in).
Gypsum: 0 to 1 percent
Sodium Adsorption Ratio: 5 to 35. Sodium Adsorption Ration increases with depth and is 15 to more than 30 in some horizon within 64 cm (25 in) of the soil surface.
Effervescence: strongly or violently effervescent
Reaction: slightly alkaline or moderately alkaline
2B and 3B horizon
Hue: 7.5YR, 10YR or 2.5Y
Value: 6 to 8
Chroma: 2 to 4
Texture: loam, clay loam, clay, and the clay intermingled with weathered mudstone
Clay content: 15 to 30 percent in the 2B, 30 to 50 percent in the 3B
Coarse fragments: 0 to 15 percent
Base saturation: 100
Calcium carbonate equivalent: 2 to 25 percent
Identifiable secondary carbonate: 1 to 19 percent, fine to medium, films, threads, masses and concretions
Electrical Conductivity (dS/m): 8 to 16
Gypsum: 0 to 20 percent. Visible crystals of gypsum and other salts range from 0 to 25 percent by volume and occur at depths below 102 cm (40 in).
Sodium Adsorption Ratio: 13 to 40
Effervescence: strongly or violently effervescent
Reaction: slightly alkaline or moderately alkaline
COMPETING SERIES: These are the
Aguilares (TX),
Copita (TX) and
Mcallen (TX) series. Similar soils are the
Drake (TX),
Mata (TX),
Midessa (TX), and
Palafox series.
Aguilares soils: do not have lithologic discontinuities.
Copita soils: have a paralithic contact between 51 and 102 cm (20 and 40 in) of the surface.
Mcallen soils: have electrical conductivity less than 4 dS/m within the particle size control section.
Drake and
Midessa soils: have a thermic soil temperature regime
Mata soils: are in a loamy-skeletal family
Palafox soils: are in the fine-silty particle size family
GEOGRAPHIC SETTING:
Parent material: calcareous, saline, loamy residuum weathered from mudstone
Landform: interfluves
Slope: 1 to 5 percent
Mean annual air temperature: 21.7 to 23.3 degrees C (71 to 74 degrees F)
Mean annual precipitation: 483 to 660 cm (19 to 26 in)
Precipitation pattern: moist spring and fall months and dry winter and summer months
Frost-free period: 260 to 360 days
Elevation: 65.5 to 274.3 m (215 to 900 ft)
Thornthwaite annual P-E indices: 20 to 30
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Aguilares,
Brundage,
Catarina,
Copita,
Maverick,
Montell, and
Viboras series.
Aguilares soils: have lower salinity level in the control section and are on similar positions.
Brundage soils: have a natric horizon and occur at lower positions.
Catarina,
Montell, and
Viboras soils: are in the fine particle size family and are on lower positions.
Copita soils: are moderately deep to sandstone and are on similar positions.
Maverick soils: are in the fine particle size family and occur on similar or slightly higher positions.
DRAINAGE AND PERMEABILITY:
Drainage class: Well.
Permeability class: moderately slow.
Runoff: medium on 1 to 5 percent slopes.
USE AND VEGETATION: This soil is used primarily for livestock grazing and wildlife habitat. The native vegetation in excellent condition is composed of 90 percent grasses, 5 percent woody plants, and 5 percent forbs. In excellent condition, mid grasses dominate; blackbrush and lotebush are dominant woody plants; the major forbs are velvet bundleflower, orange zexmenia and bushsunflower. As retrogression occurs, woody plants, especially blackbrush, increase in density. Grasses which increase or invade are red grama, Hall's panicum, threeawns, and Texas bristlegrass. The ecological site is Saline Clay Loam, 18-35 PZ (R083BY433TX).
DISTRIBUTION AND EXTENT: Western and Central Rio Grande Plain, Texas; LRR I; MLRA 83B and 83C; the series is of large extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Webb County, Texas, 1982. This series was proposed in Webb County, Texas, 1980.
REMARKS: Classification change from Ustollic Calciorthids to Aridic Calciustepts based on geographic distribution of the series, rainfall patterns, and vegetative production and composition. The soil has an ustic soil moisture regime that borders an aridic moisture regime.
Diagnostic horizons and features recognized in this pedon are:
Particle size control section: 25 to 102 cm (10 to 40 in).
Ochric epipedon: 0 to 18 cm (0 to 7 in). (A horizon)
Calcic horizon: 18 to 107 cm (7 to 42 in). (Bkz, Bknz, and 2Bknz horizons)
Gypsic horizon: 107 to 157 cm (42 to 62 in). (2Bknz and 3Bknyz horizons)
ADDITIONAL DATA: Characterization analyses of the typical pedon were determined by the Soil Survey Laboratory, Lincoln, Nebraska; Lab Sample Nos. 80-897 to 80-902. Selected analyses of two satellite pedons were also determined by NSSL; Lab Sample Nos. 80-903 to 80-908. Particle size analysis was performed at the local project office for 4 pedons from Duval County. The assignment of the cation-exchange activity class is inferred from lab data from Webb County, Texas. User Pedon ID: 79TX479004 and 79TX479005.
TAXONOMIC VERSION: Keys to Soil Taxonomy, Twelfth Edition, 2014.
National Cooperative Soil Survey
U.S.A.