Monwebb soil and landscape

Soil profile: Profile of Monwebb clay, 0 to 1 percent slopes, occasionally flooded. The presence of slickensides (starting at at depth of about 25 cm) indicates the high shrink-swell potential of this soil. Other soil features influencing soil properties are the presence of secondary calcium carbonates, gypsum crystals, and salt crystals. (Soil Survey of Duval County, Texas; by John L. Sackett III, Natural Resources Conservation Service)

 

Landscape: Innudation is common on areas of Monwebb clay, 0 to 1 percent slopes, occasionally flooded. Flooding typically occurs during the spring, late summer, and fall months. In the foreground, is an area of Mata very gravelly sandy clay loam, 1 to 8 percent slopes. (Soil Survey of McMullen County, Texas; by Clark K. Harshbarger, Jon Wiedenfeld, and Gary Harris, Natural Resources Conservation Service)

 

Setting

Major land resource area: MLRA 83B—Western Rio Grande Plain

Elevation: 175 to 485 feet

Mean annual precipitation: 22 to 26 inches

Mean annual air temperature: 70 to 72 degrees F

Frost-free period: 265 to 301 days

 

Composition

Major components:

Monwebb occasionally flooded and similar soils: 80 percent

Minor components: 20 percent

 

Soil Description

Monwebb soils, occasionally flooded

Landscape: Inland, dissected coastal plains

Landforms: Valley flats

Down-slope shape: Linear

Across-slope shape: Concave

Parent material: Clayey alluvium

 

Typical Profile

A and An—moderately alkaline clay

Bnss—moderately alkaline clay

Bnssz—moderately alkaline clay

Bknz—moderately alkaline clay

 

Properties and Qualities

Slope: 0 to 1 percent

Depth to first restrictive layer: No restrictive layer

Slowest soil permeability to 60 inches, above first cemented restrictive layer: 0.001 to

0.06 in/hr (very slow)

Salinity, representative within 40 inches: Non-saline

Salinity, maximum within 40 inches: Saline

Sodicity, representative within 40 inches: Sodic

Sodicity, maximum within 40 inches: Sodic

Representative total available water capacity to 60 inches: About 9.1 inches (high)

Natural drainage class: Moderately well drained

Runoff: Very low

Flooding frequency: occasional

 

Interpretive Groups

Land capability nonirrigated: 4s

Land capability irrigated: None specified

Ecological site name: Clay Flat 18-25" PZ

Ecological site number: R083BY415TX

Typical vegetation: Pink pappusgrass, buffalograss, curly-mesquite, whiplash pappusgrass, other perennial forbs, other perennial grasses, plains bristlegrass, sideoats grama, Texas wintergrass, vine mesquite, tobosagrass, alkali sacaton, white tridens, multiflower false Rhodes grass, other annual forbs, other shrubs, other trees

 

Use and Management

Major land uses: The major land uses for this soil are wildlife habitat and livestock grazing.

Wildlife habitat: This soil is well suited to wildlife habitat. Deer, dove, javelina, and quail are common in areas of this soil.

 

For additional information about the survey area, visit:

www.nrcs.usda.gov/Internet/FSE_MANUSCRIPTS/texas/TX131/Du...

 

For a detailed soil description, visit:

soilseries.sc.egov.usda.gov/OSD_Docs/M/MONWEBB.html

 

For acreage and geographic distribution, visit:

casoilresource.lawr.ucdavis.edu/see/#monwebb

 

Done