LOCATION DIANOLA                 TX

Established Series
CLG-ALN
08/2025

DIANOLA SERIES

Depth class: Very deep
Drainage class: Poorly drained
Flooding frequency and duration: Occasional, brief
Saturated hydraulic conductivity: High and very high
Parent material: Sandy lagoonal deposits
Slope: 0 to 1 percent
Mean annual air temperature: 22 degrees C (72 degrees F)
Mean annual precipitation: 991 millimeters (39 inches)

TAXONOMIC CLASS: Siliceous, hyperthermic Sodic Psammaquents

TYPICAL PEDON: Dianola fine sandy loam, on a nearly level native rangeland at an elevation of 1 meter (3 feet). (Colors are for moist soil unless otherwise stated.)

Ag--0 to 10 centimeters; dark gray (10YR 4/1) fine sandy loam, gray (10YR 6/1) dry; weak fine granular structure; slightly hard, very friable; common fine roots; many medium and fine pores; saline; moderately alkaline (pH 8.2); clear smooth boundary. (8 to 20 centimeters thick)

Cg1--10 to 38 centimeters; dark gray (10YR 4/1) loamy fine sand, gray (10YR 6/1) dry; single grain; soft, loose; common fine roots; saline; moderately alkaline (pH 8.2); gradual smooth boundary.

Cg2--38 to 51 centimeters; gray (10YR 5/1) loamy fine sand, gray (10YR 6/1) dry; single grain, soft, loose; few fine roots; few fine faint brown (10YR 5/3) iron concentrations; saline; moderately alkaline (pH 8.1); gradual smooth boundary.

Cg3--51 to 71 centimeters; light gray (10YR 7/2) loamy fine sand, light gray (10YR 7/2) dry; single grain; soft, loose; few fine roots; few fine distinct yellow (10YR 7/6) iron concentrations; thin discontinuous lenses of very pale brown loamy fine sand; saline; moderately alkaline (pH 8.1); clear smooth boundary.

Cg4--71 to 107 centimeters; light gray (10YR 7/2) loamy fine sand, very pale brown (10YR 8/2) dry; single grain; loose, soft; thin stratified lenses of brownish yellow (10YR 6/6) loamy fine sand; many medium and coarse distinct dark brown (10YR 3/3) iron concentrations; common fine and medium yellowish brown (10YR 5/6) iron concentrations; saline; moderately alkaline (pH 8.1); gradual smooth boundary. (20 to 203 centimeters, combined thickness of Cg horizons)

C--107 to 200 centimeters; pale brown (10YR 6/3) fine sand, very pale brown (10YR 7/3) moist; single grain; loose; few thin strata of gray (10YR 5/1) loamy fine sand; saline; moderately alkaline (pH 8.1).

TYPE LOCATION:
Calhoun County, Texas; approximately 9.8 kilometers (6 miles) southeast of Seadrift and approximately 8.3 kilometers (5.2 miles) east-northeast of Mosquito Point; Site is in an intermound area approximately 133 meters (436 feet) west of the intersection of nearby drainage ditch and unnamed road; USGS quadrangle: Long Island, TX

Latitude: 28.3609360
Longitude: -96.6246080
Datum: WGS84
Coordinate source: Estimated from other source

RANGE IN CHARACTERISTICS:
Depth to bedrock: Greater than 200 centimeters
Soil moisture control section: Depth to seasonal high-water table is 45 to 100 centimeters
Moisture regime: Aquic, 0 to 200 centimeters
Reaction throughout: Moderately to strongly alkaline (pH 7.9 to 9.0)
Electrical conductivity throughout: 26 to 70 dS/meter
Exchangeable sodium percentage: 15 percent or greater
Sodium adsorption ratio: Greater than 13 percent
Shell fragments: 0 to 25 percent
Particle-size control section (weighted average):
Clay content-0 to 12 percent
Sand content-72 to 95 percent

Ag horizon:
Hue-10YR or 2.5Y
Value-6 or 7
Chroma-1 or 2
Texture-loamy fine sand, fine sandy loam, or their shelly analogs

Cg horizons:
Hue-10YR or 2.5Y
Value-5 to 8
Chroma-1 or 2
Texture-fine sand, loamy fine sand, or their shelly analogs

C horizons (where present):
Hue-10YR or 2.5Y
Value-5 to 7
Chroma-3 to 5
Texture-fine sand, loamy fine sand, or their shelly analogs

COMPETING SERIES: These are Madre, Satatton, and Tatton soils.
Madre soils: have more reduced hues and lower chromas, are sandier throughout, and sometimes have buried A horizons.
Satatton soils: have a SAR greater than 40, electrical conductivity values of more than 30, and often are not vegetated.
Tatton soils: have a SAR greater than 40, electrical conductivity values of more than 30, are slightly lower on the landscape, and very frequently flooded.

GEOGRAPHIC SETTING:
Parent material: Sandy lagoonal deposits
Landscape: Barrier islands and coastal plains
Landform: Low dunes, back barrier flats, and subaerial washover-fans
Slope: 0 to 1 percent
Mean annual air temperature: 21 to 23 degrees C (70 to 73 degrees F)
Mean annual precipitation: 812 to 1194 millimeters (35 to 45 inches)
Elevation: 0 to 1.5 meters (0 to 5 feet)
Frost free period: 330 to 365 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are Arrada, Galveston, and Mustang soils.
Arrada soils: are at a slightly lower elevations, have finer textures and flooded more frequently.
Galveston soils: are at slightly higher elevations/landscape positions and lack aquic moisture regime.
Mustang soils: are on similar landforms, have lower electrical conductivity readings, and have lower sodium adsorption ratios.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: Poorly drained
Saturated hydraulic conductivity class: High and very high
Flooding frequency and duraction: Occasional, brief
Seasonal water table: 45 to 100 centimeters
Surface runoff: Very slow

USE AND VEGETATION:
Major uses:Rangeland
Native vegetation: Shoregrass, Gulf cordgrass, seashore saltgrass, buckwheat, and other halophytes.
Ecological site: R150BY551TX-Salty Prairie

DISTRIBUTION AND EXTENT:
General area: On barrier islands and mainlands near bays along the central coast of Texas
Land Resource Region: T-Atlantic and Gulf Coast Lowland Forest and Crop Region
MLRA(s): 150B-Gulf Coast Saline Prairies
Extent: Moderate

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Special Projects Office

SERIES ESTABLISHED: Calhoun County, Texas, 1972

REMARKS:
Salinity of the soil solution expressed as dS/m ranges from 26 to 70. The SAR is more than 13, ESP more than 15 and the exchangeable Mg+Na is more than Ca+A1+H.
Dianola has a SAR of greater than 13 which changes the taxonomy from Typic Psammaquents to Sodic Psammaquents, that will compete with Madre on barrier islands of MLRA 150B.

Typical pedon taxonomic features:
Aquic conditions: 0 to 200 centimeters (Ag, Cg and C horizons)
Ochric epipedon: 0 to 10 centimeters (Ag horizon)
Salinity class: Strongly saline below 10 centimeters (Cg and C horizons)
Sodic properties: SAR greater than 13, 0 to 200 centimeters (Ag, Cg and C horizons)
Taxonomic Version: Keys to Soil Taxonomy, 13th Edition (2022)

Additional Data:
Lincoln Lab. sample numbers 70L770-70L772 for mineralogy and partial particle size data. The morphology of the pedon represented by these samples suggest the presence of an incipient spodic horizon but the expression is too weak to qualify as Spodic Psammaquents. Also, Lincoln Lab. sample no. 73L557 or mineralogy, halic properties and particle size data.

OSD User Pedon ID: 1970TX0573000
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National Cooperative Soil Survey
U.S.A.