LOCATION BOBNBOB NV
Established Series
Rev. RS/RLB/WED/TM
04/2015
BOBNBOB SERIES
The Bobnbob series consist of very deep, somewhat poorly drained soils that formed in mixed alluvium. They are on flood plains. Mean annual precipitation is about 6 inches, mean annual temperature is about 62 degrees F. Slopes are 0 to 2 percent.
TAXONOMIC CLASS: Fine-silty, mixed, superactive, calcareous, thermic Aquic Torrifluvents
TYPICAL PEDON: Bobnbob silty clay loam, rangeland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 3 inches; very pale brown (10YR 8/3) silty clay loam, brown (10YR 5/3) moist; moderate medium platy structure; slightly hard, very friable, sticky and plastic; common fine and medium roots; few fine vesicular and common fine and medium tubular pores; violently effervescent; very strongly alkaline; (pH 8.8) clear wavy boundary. (2 to 4 inches thick)
A2--3 to 7 inches; light gray (10YR 7/2) silty clay loam, brown (10YR 5/3) moist; weak coarse subangular blocky structure; slightly hard, very friable, sticky and plastic; many fine and common medium roots; common fine tubular pores; few faint clay films in root channels; violently effervescent; strongly alkaline; (pH 8.8) clear wavy boundary. (3 to 5 inches thick)
C1--7 to 13 inches; light gray (10YR 7/2) clay loam, brown (10YR 5/3) moist; massive, slightly hard, very friable, slightly hard, very friable, slightly sticky and plastic; many very fine and fine roots; common fine and medium tubular pores; violently effervescent; very strongly alkaline; (pH 9.2) clear wavy boundary. (4 to 8 inches thick)
C2--13 to 23 inches; pale brown (10YR 6/3) silty clay loam, brown (10YR 5/3) moist; massive; hard, friable, sticky and plastic; many fine and common very fine roots; common very fine and fine tubular pores; violently effervescent; very strongly alkaline; (pH 9.2) gradual wavy boundary. (5 to 15 inches thick)
C3--23 to 29 inches; very pale brown (10YR 7/3) clay, pale brown (10YR 6/3) moist, massive; hard, friable, sticky and plastic; common fine and few medium roots; common fine tubular pores; common medium faint light yellowish brown (10YR 6/4) mottles; violently effervescent; very strongly alkaline; (pH 9.2) clear wavy boundary. (5 to 12 inches thick)
2Ab--29 to 38 inches; light brownish gray (10YR 6/2) silty clay loam, brown (10YR 4/3) moist; few fine prominent reddish brown (5YR 5/4) mottles; massive; slightly hard, friable, sticky and plastic; few fine roots; common fine and medium tubular pores; strongly effervescent; strongly alkaline; (pH 8.8) gradual wavy boundary. (0 to 10 inches thick)
2Cb--38 to 52 inches; very pale brown (10YR 8/2) clay loam, pale brown (10YR 6/3) moist; massive; slightly hard, very friable, sticky and plastic; common fine and few medium roots, common fine and medium tubular pores; common coarse light brownish gray (10YR 6/2) mottles; few distinct reddish yellow (7.5YR 6/6) strongly effervescent; strongly alkaline; (pH 8.8) clear wavy boundary. (10 to 20 inches thick)
3Ckqb--52 to 60 inches; very pale brown (10YR 7/3) sandy loam, brown (10YR 4/3) moist; massive; soft, very friable, nonsticky and nonplastic; few fine interstitial pores; yellowish brown (10YR 5/6) mottles; common medium and fine very pale brown (10YR 8/2) lime masses; weakly lime cemented; 5 percent durinodes; matrix effervescent, lime masses violently effervescent; strongly alkaline; (pH 8.8).
TYPE LOCATION: Nye County, Nevada; about 700 feet west and 400 feet north of the southeast corner of section 12 T. 2 N. R. 43 E.
RANGE IN CHARACTERISTICS:
Soil moisture - Usually dry, intermittently moist in winter and spring, dry in summer and fall. Typic Aridic soil moisture regime. The ratio of soil moisture utalized for evapotranspiration between summer and winter is about 0.4:1, typical of the Mojave Desert. (Saturated at depths of 3 to 5 feet in late winter and spring, unless drained.)
Soil temperature - 59 to 65 degrees F.
Depth to saturated conditions - 36 to 40 inches
Reaction: Strongly or very strongly alkaline
Control section - Clay content: 27 to 35 percent.
A horizon - Value: 6 through 8 dry, 5 or 6 moist.
Chroma: 2 or 3.
C horizon - Hue: 10YR, 2.5Y or 5Y.
Value: 6 through 8 dry, 5 through 7 moist.
Chroma: 2 or 3.
Texture: Stratified fine sandy loam to clay, averages silty clay loam.
Carbonates: 20 to 40 percent calcium carbonate equivalent.
2Ab horizon (when present)- Value: 5 or 6 dry, 3 through 5 moist.
Chroma: 2 or 3.
Texture: Silt loam, loam or silty clay loam.
3Ckq - Hue: 10YR, 2.5Y or 5Y.
Value: 7 or 8 dry, 4 through 7 moist.
Carbonate: 40 to 60 percent calcium carbonate equivalent.
COMPETING SERIES: There are no competing series at this time.
GEOGRAPHIC SETTING: Bobnbob soils are on flood plains along the basin floor. They formed in mixed alluvium with a large amount of limestone. Slopes are 0 to 2 percent. Elevations range from 2000 to 2500. The climate is typical of the Mojave Desert with hot, dry summers and mild winters. The mean annual temperature is 59 to 63 degrees F. The mean annual precipitation is 4 to 8 inches and the frost-free season is 200 to 250 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are
Caslo and
Cobatus soils. Caslo soils are carbonatic and Cobatus soils have fine-loamy control sections.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; runoff is slow; permeability is slow.
USE AND VEGETATION: Rangeland. The present vegetation is mostly saltgrass.
DISTRIBUTION AND EXTENT: Southwest Nevada. Small extent, MLRA 30.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: PHOENIX, ARIZONA
SERIES ESTABLISHED: Nye County, Nevada, Southwest Part, 1994.
REMARKS: The name is coined.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 0 to 7 inches (A1 and A2 horizons).
Particle-size control section - 10 to 40 inches.
Organic Matter - Decreases irregularly with depth.
Aquic feature - The soil is saturated at 3 to 5 feet in late winter and early spring.
Responsibility for this series was transferred from Davis to Phoenix 4/2015. The last revision to the series was 1/2001. ET
National Cooperative Soil Survey
U.S.A.