LOCATION RANDS IDEstablished Series
TAXONOMIC CLASS: Fine, smectitic, frigid Typic Palexerolls
TYPICAL PEDON: Rands loam, cultivated. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 9 inches; brown (10YR 5/3) loam, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure parting to weak fine granular; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; many fine interstitial pores; slightly acid (pH 6.4); clear smooth boundary. (7 to 10 inches thick)
A12--9 to 17 inches; brown (10YR 5/3) loam, dark brown (10YR 3/3) moist; moderate fine and medium subangular blocky structure; hard, firm, slightly sticky and slightly plastic; many very fine and fine, common medium roots; many very fine and fine tubular pores; slightly acid (pH 6.2); abrupt wavy boundary. (3 to 9 inches thick)
B21t--17 to 20 inches; brown (7.5YR 5/4) clay, dark brown (7.5YR 4/4) moist; moderate fine angular blocky structure; very hard, firm, very sticky and very plastic; many very fine and fine, few medium roots; common very fine tubular pores; many moderately thick clay films on faces of peds and in pores; common pinkish gray (7.5YR 7/2) silt coatings on vertical and horizontal faces of peds; slightly acid (pH 6.2); abrupt wavy boundary. (1 to 4 inches thick)
B22t--20 to 28 inches; brown (7.5YR 5/4) clay, dark brown (7.5YR 4/4) moist; moderate fine prismatic structure parting to moderate fine angular blocky; very hard, very firm, very sticky and very plastic; many very fine and few medium roots on faces of peds; common very fine tubular pores; continuous moderately thick clay films on faces of peds and in pores; neutral (pH 6.6); clear smooth boundary. (6 to 10 inches thick)
B23t--28 to 33 inches; brown (7.5YR 5/4) clay loam, dark brown (7.5YR 4/4) moist; moderate fine prismatic structure parting to moderate very fine angular blocky; very hard, firm, sticky and plastic; common very fine roots; many very fine tubular pores; many moderately thick clay films on faces of peds and in pores; mildly alkaline (pH 7.8); abrupt wavy boundary. (3 to 8 inches thick)
B3tca--33 to 41 inches; reddish yellow (7.5YR 6/6) fine gravelly clay loam, strong brown (7.5YR 5/6) moist; moderate medium prismatic structure parting to moderate very fine angular blocky; hard, firm, sticky and plastic; common very fine roots; many very fine tubular pores; many moderately thick clay films on faces of peds and in pores; lime segregated in common medium seams on vertical faces of peds; moderately alkaline (pH 8.0); abrupt wavy boundary. (2 to 9 inches thick)
C1--41 to 46 inches; pink (7.5YR 7/4) gravelly loamy sand, brown (7.5YR 4/4) moist; massive; slightly hard, loose; few very fine roots; mildly alkaline (pH 7.8); gradual wavy boundary. (4 to 10 inches thick)
C2--46 to 60 inches; very pale brown (10YR 7/3) gravelly loamy coarse sand, brown (7.5YR 5/4) moist; massive; slightly hard, loose; few very fine roots; moderately alkaline (pH 8.0).
TYPE LOCATION: Camas County, Idaho; about 7 miles east of Fairfield; 925 feet east and 435 feet north of the southwest corner of sec. 11, T. 1 S., R. 15 E.
RANGE IN CHARACTERISTICS: This soil is usually moist, but is dry for 45 to 70 consecutive days during the late summer and autumn. The mean annual soil temperature ranges from 41 degrees to 45 degrees F., and the mean summer soil temperature is 61 degrees to 65 degrees F. The thickness of the solum is 30 to 50 inches. The mollic epipedon is 10 to 19 inches thick. Usually the soil is weakly to strongly effervescent in the B3 or C horizons, but some pedons are noncalcareous throughout.
The A horizon has chroma of 2 or 3.
The B2t horizon has hue of 10YR or 7.5YR, value of 5 or 6 dry, and chroma of 3 or 4. It is clay or clay loam and averages more than 35 percent clay. It contains up to 5 percent fine pebbles.
The C horizon is gravelly loamy coarse sand through loam.
COMPETING SERIES: These are the Deer Creek, Goodington, Harkers, Norcan, and Zumwalt series. Deer Creek soils have a calcic horizon with 30 to 60 percent calcium carbonate. Goodington soils have bedrock at depths of 40 to 60 inches. Harkers soils have 20 to 35 percent coarse fragments in the B2t horizon. Norcan soils have an O horizon and have sola more than 60 inches thick. Zumwalt soils have an A2 horizons and are moderately deep over bedrock.
GEOGRAPHIC SETTING: The Rands soils are on alluvial fans and terraces. Slopes are 0 to 25 percent, but are dominantly 2 to 11 percent. Elevation is 4,800 to 6,000 feet. The soils formed in mixed alluvium are dominantly 2 to 11 percent. Elevation is 4,800 to 6,000 feet. The soils formed in mixed alluvium mainly from andesite and volcanic tuff. Mean annual temperature is 39 degrees to 43 degrees F. The climate is Humid mainly from andesite and volcanic tuff. Mean annual temperature is 39 degrees to 43 degrees F. The climate is Humid continental, cool summers (Trewartha's modified Koppen system) with cold moist winters and dry summers. Mean annual precipitation is 12 to 16 inches and average frost-free period is 70 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Brinegar, Simonton, and Vodermaier soils. Brinegar soils have a mollic epipedon more than 20 inches thick, a clay loam Bt horizon and are moderately well drained. Simonton soils have a fine-loamy control section. Vodermaier soils have a sandy control section.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; very slow permeability.
USE AND VEGETATION: Irrigated cropland, nonirrigated cropland and range. Crops are small grain and alfalfa hay and pasture. Vegetation is Sandberg bluegrass, Idaho fescue, and alkali sagebrush.
DISTRIBUTION AND EXTENT: Southwestern and south-central Idaho. The series is moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Camas County, Idaho, 1977.