LOCATION ISLA TXTentative Series
TAXONOMIC CLASS: Fine-loamy over sandy or sandy-skeletal, mixed, superactive, nonacid, thermic Typic Torrifluvents
TYPICAL PEDON: Isla sandy clay loam--cropland. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 41 centimeters (0.0 to 16.1 inches); brown (7.5YR 5/3) crushed sandy clay loam, brown(7.5YR 4/3) crushed, moist; 57 percent sand; 22 percent silt; 21 percent clay; strong coarse cloddy structure; noncemented, nonsticky, nonplastic; moderate excavation difficulty; electrical conductivity of 0.7 mmhos/cm by ec meter, 1:1 water; strong effervescence, by HCl, 1 normal; moderately alkaline, pH 8.0, pH meter 1:1 water; abrupt smooth boundary. Lab sample # D7361. (15 to 20 inches thick)
C--41 to 203 centimeters (16.1 to 79.9 inches); light brown (7.5YR 6/3) crushed fine sand, brown(7.5YR 4/2) crushed, moist; 96 percent sand; 2 percent silt; 2 percent clay; massive; noncemented, nonsticky, nonplastic; moderate excavation difficulty; electrical conductivity of 0.3 mmhos/cm by ec meter, 1:1 water; noneffervescent, by HCl, 1 normal; moderately alkaline, pH 8.1, pH meter 1:1 water; common thin (.5 to 2 inch thick) pink (7.5YR 7/3) crushed strata of very fine sandy loam and loamy fine sand, brown (7.5YR 5/3) crushed, moist. Lab sample # D7362.
TYPE LOCATION: El Paso County, Texas; from the Tornillo exit of Interstate 10, 2.4 miles west to Highway 20; 3.6 miles south on Highway 20; 0.58 miles southwest on field road; 663 feet northwest in field. Tornillo USGS 7.5 minute topographic quadrangle. Latitude 31 degrees 24 minutes 30.85 seconds north and longitude 106 degrees 02 minutes 50.30 seconds west. UTM zone 13, 400442E, 3475172N; NAD 27.
RANGE IN CHARACTERISTICS:
Soil Moisture: Typic aridic soil moisture regime. The moisture control section is usually dry in all parts more than three-fourths of the time that the soil temperature exceeds 41 degrees F.
Mean annual soil temperature: 63 to 67 degrees F.
Particle-size control section (weighted average):
Contains contrasting textures:
Upper part:
Clay content: 20 to 35 percent
Sand content: greater than 50 percent
Lower part:
Clay content: 0.7 to 7 percent
Sand content: greater than 70 percent
Ap horizon:
Value: 5 or 6, dry, 4 or 5 moist
Chroma: 2 to 4, dry or moist
Clay content: 20 to 35 percent
Rock fragments: 0 to less than 1 percent
C horizon:
Value: 6 or 7 dry, 4 or 5 moist
Chroma: 2 to 4, dry or moist
Texture: fine sand with few to many thin strata of very fine sand, very fine sandy loam, loam, or silt loam
Clay content: 0.7 to 7 percent
Rock fragments: 0 to less than 1 percent
Stratification: Usually .5 to 3 inches thick consisting of finer or coarser material. Some strata may range to 8 inches thick.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING:
Parent material: fine-loamy mixed alluvium over sandy alluvium deposited by water
Landform: flood plain, protected by large dams
Slope: 0 to 1 percent
Mean annual air temperature: 62 to 66 degrees F.
Mean annual precipitation: 8 to 10 inches
Precipitation pattern: precipitation falls mostly during the months of July through September. The driest months are March and April. Precipitation during the months of January, February, and March is less than 13 percent of the total.
Frost-free period: 200 to 240 days
Elevation: 3,600 to 3,800 feet
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Alcazar,
Fabens,
Lantana,
Riverway,
Tigua, and
Ysleta soils.
Alcazar soils are coarse-silty over sandy or sandy-skeletal and are on similar positions.
Fabens soils are clayey over loamy and are on similar positions.
Lantana soils coarse-loamy over sandy or sandy-skeletal and are on similar positions.
Riverway soils are fine-loamy and are on similar positions.
Tigua soils are very-fine and are on similar positions.
Ysleta soils are sandy and are on similar positions.
DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderately slow in the solum and moderately rapid in the substratum. Runoff is low.
USE AND VEGETATION: Used for irrigated crops.
DISTRIBUTION AND EXTENT: Rio Grande Valley of Texas and southern New Mexico; LRR D, MLRA 42; small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES PROPOSED: El Paso County, Texas; 2004.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 10 to 40 inches. (Ap and C horizons)
Ochric epipedon: The zone from 0 to 7 inches. (Ap and C horizons, mixed)
Entisol feature - The absence of diagnostic subsurface horizons
ADDITIONAL DATA: Soil characterization data is available on this series, sample Number S03TX141-004.