LOCATION YAHOO IDEstablished Series
TAXONOMIC CLASS: Loamy, mixed, superactive, mesic, shallow Xeric Haplodurids
TYPICAL PEDON: Yahoo silt loam--on a northwest facing slope of 2 percent under rangeland vegetation at 3,805 feet elevation. (Colors are for dry soil unless otherwise stated.) When described on September 12, 1984, the soil profile was dry.
A--0 to 3 inches; pale brown (10YR 6/3) silt loam, brown (10YR 4/3) moist; moderate medium platy structure; soft, friable, slightly sticky and slightly plastic; many very fine, fine, and few medium roots; many very fine and fine tubular pores; strongly effervescent; (12 percent calcium carbonate); slightly alkaline (pH 7.8); clear smooth boundary. (3 to 5 inches thick)
Bk--3 to 9 inches; brown (10YR 5/3) silt loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; slightly hard, friable, sticky and plastic; common very fine and fine roots; common very fine and fine tubular pores; slightly effervescent; (15 percent calcium carbonate); moderately alkaline (pH 8.0); abrupt smooth boundary. (0 to 9 inches thick)
Bkq--9 to 14 inches; very pale brown (10YR 7/3) silt loam, brown (10YR 5/3) moist; weak medium subangular blocky structure; hard, friable, sticky and plastic; few very fine and fine roots; few very fine and fine tubular pores; 15 percent durinodes; violently effervescent; (30 percent calcium carbonate); moderately alkaline (pH 8.0); abrupt smooth boundary. (0 to 9 inches thick)
2Bkqm--14 to 34 inches; indurated duripan with continuous silica and calcium cemented 1/8 inch laminar cap over imbedded lamellae of silica pans and very pale brown (10YR 7/3) very fine sandy loam, brown (10YR 5/3) moist; massive; very hard, very firm and brittle (pans are about 5 percent of mass); root matting on surface of laminar cap with few very fine roots along fracture planes; violently effervescent; (14 percent calcium carbonate); moderately alkaline (pH 8.2); abrupt smooth boundary. (8 to 26 inches thick)
3Bkqm--34 to 60 inches; fractured duripan; 1/4 to 2 inch silica lenses throughout extremely hard, platy, rock-like material.
TYPE LOCATION: Twin Falls County, Idaho; about 9 miles west of Buhl, Idaho in the northeast 1/4, northeast 1/4, northwest 1/4 of section 28, T. 9 S., R. 13 E.
RANGE IN CHARACTERISTICS:
Soil temperature - 49 to 51 degrees F.
Depth to carbonates - 0 to 4 inches
Depth to bedrock - greater than 60 inches
Depth to duripan - 12 to 20 inches
Control section - clay: 20 to 30 percent
Control section texture - silt loam, silty clay loam
A horizon
Value - 5 or 6 dry, 3 or 4 moist
Reaction - neutral or mildly alkaline
Effervescence - none through strong
Calcium carbonate - 0 to 15 percent
Bkq horizon
Value - 5 through 7 dry, 3 through 5 moist
Clay percentage in thin sub horizon - 14 to 20
Durinodes - 5 to 20 percent
Effervescence - strong or violent
Calcium carbonate - 10 to 30 percent
Bkqm horizon
Thickness laminar cap - 1/16 to 1/4 inch
Texture below laminar cap - VFSL, L, or SIL
Effervescence - strong or violent
Calcium carbonate - 10 to 30 percent
COMPETING SERIES: These are the Arritola (T), Chiara, Crooked, Frohman, Minveno, Nevoyer, Otoole, Peeko, Plegomir, Scoon, and Tenvorrd soils. Arritola soils are non-calcareous above the pan, and Chiara soils are non-calcareous above 7 inches. Chiara, Crooked, Frohman, Minveno, Otoole, Plegomir, and Scoon soils have less than 18 percent clay in the control section. Arritola, Crooked, Plegomir, and Scoon soils have more than 15 percent coarser than very fine sand in the control section. Nevoyer soils are less than 20 inches to bedrock. Otoole soils are somewhat poorly drained, and are strongly or very strongly alkaline. Peeko soils have 15 to 35 percent coarse fragments, and Scoon soils have up to 35 percent coarse fragments in the control section. Tenvorrd soils do not have durinodes described above the duripan. The duripan is indurated throughout, and lacks textures of very fine sandy loam, loam or silt loam below the laminar cap.
GEOGRAPHIC SETTING: Yahoo soils are on old dissected terraces. These soils formed in old alluvium from mixed sources. Slopes are 0 to 4 percent. Elevations are 3,400 to 4,300 feet. The average annual precipitation is 8 to 10 inches. The average annual temperature is 47 to 49 degrees F. and the frost free season is 120 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Blacknest, Chuska, Purdam, Rakane, Sluka, and Tulch soils. Blacknest soils lack duripans. Chuska soils have argillic horizons. Purdam, Rakane, and Sluka soils are moderately deep to a duripan. All the above soils are on the same landform as Yahoo. Tulch soils lack duripans, and are on lower terraces and large drainageways.
DRAINAGE AND PERMEABILITY: Well drained; runoff is slow or medium; permeability is moderate.
USE AND VEGETATION: Yahoo soils are used for rangeland and irrigated crops. Native vegetation is Wyoming big sagebrush, Thurber needlegrass, and Sandberg bluegrass. Irrigated crops are mainly wheat, barley, sugar beets, potatoes, beans, and alfalfa hay.
DISTRIBUTION AND EXTENT: Yahoo soils are of small extent in south central Idaho.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Twin Falls County, Idaho, 1992. The name is from a nearby creek.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from the soil surface to 3 inches (A horizon)
Calcic horizon - the zone from 3 to 14 inches (Bk and Bkq horizons)
Duripan - the zone from 14 to 60 inches (2Bkqm and 3Bkqm horizons)
Particle size control section - the zone from the soil surface to 14 inches (A, Bk, and Bkq horizons)