LOCATION LAGUNITA AZEstablished Series
TAXONOMIC CLASS: Mixed, hyperthermic Typic Torripsamments
TYPICAL PEDON: Lagunita loamy sand - desert. (Colors are for dry soil unless otherwise noted.)
A--0 to 8 inches; pale brown (10YR 6/3) loamy sand, dark brown (10YR 3/3) moist; single grain; loose, dry and moist; many very fine roots; many very fine irregular pores; few very fine black sandy biotite flakes in thin strata; slightly effervescent; moderately alkaline (pH 8.0); clear wavy boundary. (4 to 12 inches thick)
C1--8 to 30 inches; pale brown (10YR 6/3) weakly stratified loamy sand, brown (10YR 4/3) moist; single grain; loose, dry and moist; many very fine and fine roots; many very fine irregular pores; many very fine black sandy biotite flakes in thin strata; slightly effervescent; moderately alkaline (pH 8.0); gradual wavy boundary. (15 to 25 inches thick)
C2--30 to 60 inches; pale brown (10YR 6/3) weakly stratified loamy sand, brown (10YR 4/3) moist; single grain; loose dry and moist; many very fine roots; many very fine irregular pores; many very fine black sandy biotite flakes in thin strata; slightly effervescent; moderately alkaline (pH 8.2).
TYPE LOCATION: Yuma County, Arizona; 1,000 feet south and 2,200 feet east of the southeast corner of section 24, R. 17 W., R. 8 S.
RANGE IN CHARACTERISTICS:
Soil moisture - Usually dry, intermittently moist in some part of the soil moisture control section during July - September and December - February. Driest during May and June. Typic aridic soil moisture regime.
Soil temperature - 72 to 77 degrees F.
Rock fragments - Mainly less than 15 percent gravel by volume.
Organic matter content - Less than 1 percent decreasing irregularly with depth.
Calcium carbonate - Noneffervescent to violently effervescent. Calcium carbonate is disseminated; less than 5 percent calcium carbonate equivalent.
Salinity- Slightly to strongly saline
Reaction - Slightly or moderately alkaline
A horizon
Hue: 10YR, 7.5YR
Value: 5, 6 or 7 dry, 3, 4 or 5 moist
Chroma: 3 or 4, dry or moist
C horizon
Hue: 10YR, 7.5YR
Value: 5, 6 or 7 dry, 4, 5 or 6 moist
Chroma: 2, 3, 4 or 5 dry, 3 or 4 moist
Texture: Stratified loamy sand, sand, coarse sand, and loamy coarse sand
COMPETING SERIES: These are the Carsitas (CA), Myoma (CA), Pintobasin (T)(CA), and Rositas (CA) series. Carsitas soils average 15 to 35 percent coarse fragments in the control section. Myoma soils have hue of 10YR or yellower and are not subject to flooding. Pintobasin soils average more than 15 percent rock fragments, dominantly gravel, in the control section and are slightly acid to neutral throughout. Rositas soils have less than 15 percent coarse and very coarse sand and are on sand dunes.
GEOGRAPHIC SETTING: Lagunita soils are on flood plains and generally have slopes of 0 to 3 percent, but range to include 5 percent. They formed in stratified stream alluvium from mixed sources. Elevations are 75 to 1,400 feet. The climate is hot, arid and continental. Mean annual precipitation is 2 to 10 inches, which occurs as summer thunderstorms and as gentle winter rains. Mean annual air temperature ranges 69 to 76 degrees F. Frost-free period is about 240 to 325 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are Glenbar, Indio and Ripley soils. Glenbar soils have a fine-silty control section. Indio soils have a coarse-silty control section. Ripley soils have a coarse-silty over sandy control section.
DRAINAGE AND PERMEABILITY: Excessively drained; low runoff; rapid permeability.
USE AND VEGETATION: Used mainly for livestock grazing and wildlife habitat, but citrus, alfalfa and small grains are grown under irrigation in some areas. The vegetation is mainly fourwing saltbush, mesquite, creosotebush, globe mallow and sand verbena.
DISTRIBUTION AND EXTENT: Southern Arizona. The soils are moderately extensive. MLRA is 31 and 40.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Phoenix, Arizona
SERIES ESTABLISHED: Yuma County (Yuma-Wellton Area), Arizona; 1978.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
This soil does not have stratification with soil material finer than loamy sand.
Classified according to Keys to Soil Taxonomy, Ninth Edition, 2003.