LOCATION BURRODROP CA
Established Series
REV: LJL/PBF/ET
04/2015
BURRODROP SERIES
The Burrodrop series consists of well drained soils that formed in mixed alluvium, dominantly igneous. The Burrodrop soils are on fan remnants. Slope ranges from 2 to 8 percent. The mean annual precipitation is about 4 inches and the mean annual air temperature is about 72 degrees F.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, hyperthermic Typic Natrigypsids
TYPICAL PEDON: On Burrodrop extremely cobbly sandy loam, 2 to 8 percent slopes, at an elevation of 1,460 feet. (Colors are for dry soil unless otherwise noted.) The surface is covered by approximately 40 percent gravel, 35 percent cobbles, and 15 percent stones.
A -- 0 to 1 inch; very pale brown (10YR 7/4) extremely cobbly sandy loam, dark yellowish brown (10YR 4/4) moist; moderate thin platy and fine subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; common very fine and fine roots; many fine interstitial and vesicular pores; violently effervescent; 30 percent gravel, 25 percent cobbles, and 10 percent stones; strongly alkaline (pH 8.7); SAR of 4, electrical conductivity of 3 dS/m; abrupt wavy boundary. (1 to 10 inches thick)
An -- 1 to 3 inches; very pale brown (10YR 7/4) loam, dark yellowish brown (10YR 4/6) moist; moderate medium subangular blocky structure; slightly hard, very friable, nonsticky and slightly plastic; common very fine and fine roots; many fine interstitial and vesicular pores; violently effervescent; 5 percent gravel, 5 percent cobbles, and trace of stones; strongly alkaline (pH 8.9); SAR of 13, electrical conductivity of 6 dS/m; abrupt wavy boundary. (0 to 3 inches thick)
Bkn -- 3 to 12 inches; light yellowish brown (10YR 6/4) loam, yellowish brown (10YR 5/4) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, nonsticky and slightly plastic; common very fine and fine roots; 10 percent medium and coarse irregular soft masses and banding of carbonates; slightly effervescent in matrix; 5 percent gravel, and trace of cobbles and stones; strongly alkaline (pH 8.7); SAR of 36, electrical conductivity of 20 dS/m; gradual wavy boundary. (0 to 10 inches thick)
Btkn -- 12 to 20 inches; yellowish brown (10YR 5/4) loam, yellowish brown (10YR 5/4) moist; weak coarse prismatic parting to moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and moderately plastic; 15 percent faint discontinuous clay films on ped faces; 15 percent medium and coarse irregular soft masses and banding of carbonates; slightly effervescent in matrix; 5 percent gravel and 3 percent cobbles; strongly alkaline (pH 8.9); SAR of 35, electrical conductivity of 20 dS/m; gradual wavy boundary.
Btknz1 -- 20 to 37 inches; pale brown (10YR 6/3) clay loam, yellowish brown (10YR 5/4) moist; massive parting to weak medium subangular blocky structure; moderately hard, friable, moderately sticky and moderately plastic; 15 percent distinct discontinuous clay films on ped faces; 25 percent medium and coarse irregular soft masses and banding of carbonates; 10 percent medium and coarse pockets of gypsum crystals; slightly effervescent in matrix; 5 percent gravel and 3 percent cobbles; strongly alkaline (pH 8.7); SAR of 32, electrical conductivity of 18 dS/m; gradual wavy boundary.
Btknz2 -- 37 to 60 inches; yellowish brown (10YR 5/4) clay loam, yellowish brown (10YR 5/4) moist; massive parting to weak medium subangular blocky structure; hard, firm, moderately sticky and moderately plastic; 60 percent prominent continuous clay films on ped faces; 25 percent medium and coarse irregular soft masses and banding of carbonates; 5 percent medium and coarse pockets of gypsum crystals; slightly effervescent in matrix; 5 percent gravel and traced of cobbles; strongly alkaline (pH 8.7); SAR of 27, electrical conductivity of 14 dS/m.
TYPE LOCATION: San Bernardino County, California; about 450 feet east and 600 feet north of the SW corner of section 9, T. 13 N., R. 5 E.; 35 degrees, 13 minutes, 41 seconds north latitude, and 116 degrees, 27 minutes, 47 seconds west longitude; Bitter Spring USGS 7.5 minute quadrangle; UTM 11S, 0548873e 3898269n (DTM:NAS-C).
RANGE IN CHARACTERISTICS:
Soil moisture control section - usually dry, moist in some part for short periods during winter and early spring and for 10 to 20 days cumulative between July and October following convection storms. The soils have a Typic-Aridic moisture regime.
Surface rock fragments: 35 to 55 percent gravel, 25 to 45 percent cobbles and 2 to 15 percent stones.
Soil temperature: 72 to 75 degrees F.
Control section -
Rock fragments: 5 to 30 percent, predominantly gravel
Clay content: 18 to 35 percent
Organic matter: 0 to 0.5 percent
A horizon
Value: 6 or 7 dry
Chroma: 3 or 4 dry, and 2 to 4 moist
Texture of the fine earth: sandy loam or loam
Rock fragments: range is 50 to 85 percent, with 30 to 55
percent gravel, 15 to 30 percent cobbles, and 1 to 10
percent stones
Clay content: 5 to 12 percent
Effervescence: strong or violent
Reaction: moderately or strongly alkaline
Sodium Adsorption Ratio: 1 to 10
Electrical conductivity: 0 to 3 dS/m
Calcium carbonate equivalent: 1 to 5 percent.
Gypsum: 0 to 1 percent
An horizon
Value: 6 or 7 dry
Rock fragments: range is 5 to 15 percent, with 5 to 10
percent gravel, 1 to 5 percent cobbles, and 0 to 1
percent stones
Clay content: 12 to 18 percent
Sodium Adsorption Ratio: 13 to 20
Electrical conductivity: 5 to 10 dS/m
Calcium carbonate equivalent: 1 to 5 percent.
Gypsum: 0 to 1 percent
Bkn horizon
Rock fragments: range is 5 to 15 percent, with 5 to 10
percent gravel, 1 to 5 percent cobbles, and 0 to 1
percent stones
Clay content: 12 to 18 percent
Calcium carbonate: 5 to 25 percent as bands and soft
masses
Effervescence: slight or strong
Sodium Adsorption Ratio: 13 to 50
Electrical conductivity: 10 to 30 dS/m
Gypsum: 0 to 1 percent
Btkn horizon
Value: 4 to 6 dry or moist
Chroma: 3 to 6 dry, and 3 or 4 moist
Texture of the fine earth: sandy loam, coarse sandy loam,
loam, or clay loam
Rock fragments: range is 5 to 70 percent, with 5 to 55
percent gravel, 1 to 25 percent cobbles, and 0 to 5
percent stones
Clay content: 12 to 35 percent
Calcium carbonate: 5 to 25 percent as bands and soft
masses
Effervescence: slight to violent
Reaction: moderately or strongly alkaline
Sodium Adsorption Ratio: 13 to 55
Electrical conductivity: 5 to 35 dS/m
Gypsum: 0 to 1 percent
Btknz horizon
Value: 4 to 6 dry or moist
Chroma: 3 to 6 dry, and 3 or 4 moist
Texture of the fine earth: sandy loam, coarse sandy loam,
loam, or clay loam
Rock fragments: range is 5 to 70 percent, with 5 to 55
percent gravel, 1 to 25 percent cobbles, and 0 to 5
percent stones
Clay content: 12 to 35 percent
Calcium carbonate: 5 to 25 percent as bands and soft
masses
Gypsum: 5 to 10 percent
Effervescence: slight to violent
Reaction: moderately or strongly alkaline
Sodium Adsorption Ratio: 13 to 55
Electrical conductivity: 5 to 35 dS/m
COMPETING SERIES: There are no competing series at this time.
GEOGRAPHIC SETTING: Burrodrop soils are on fan remnants. Slopes are 2 to 8 percent. These soils formed in mixed alluvium. Elevations are 1,150 to 1,600 feet. The climate is arid with hot, dry summers and warm, moist winters. The mean annual precipitation is 3 to 5 inches; mean annual air temperature is 70 to 73 degrees F., and the frost-free season is 320 to 360 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Carrizo,
Rositas, and
Sunrock soils. Carrizo and Rositas soils are in inset fans and on dunes, and have sandy-skeletal and sandy particle-size control sections, respectively. Sunrock soils are on mountains, are shallow to bedrock and have loamy-skeletal particle-size control sections.
DRAINAGE AND PERMEABILITY: Well drained; low to medium runoff; slow permeability.
USE AND VEGETATION: Burrodrop soils are used for military exercises and wildlife habitat. The present vegetation is mainly sparse desert holly and creosotebush.
DISTRIBUTION AND EXTENT: Mojave Desert of southeastern California. MLRA 30. These soils are of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: PHOENIX, ARIZONA
SERIES ESTABLISHED: San Bernardino County, California, Fort Irwin Soil Survey Area, 2000. The name is coined.
REMARKS: Diagnostic horizons and features recognized in the profile are:
1. Ochric epipedon -- 0 to 1 inch (A horizon).
2. Argillic horizon -- 12 to 60 inches (Btkn horizon)
3. Calcic horizon -- 3 to 60 inches (Bkn and Btkn horizons).
4. Natric horizon -- 12 to 60 inches (Btkn, Btknz1 and
Btknz2 horizons)
5. Gypsic horizon -- 20 to 60 inches (Btknz1 and Btknz2)
horizons)
6. Particle-size control section -- 12 to 32 inches (Btkn
and part of the Btknz horizon).
Responsibility for this series was transferred from Davis to Phoenix 4/2015. The last revision to the series was 5/2000. ET
National Cooperative Soil Survey
U.S.A.