LOCATION IPHIL ID+WYEstablished Series
TAXONOMIC CLASS: Coarse-silty, mixed, superactive, frigid Typic Calcixerolls
TYPICAL PEDON: Iphil silt loam on a hill with 10 percent slope at 1646 meters elevation. When described on November 10, 1987 the soil was moist from 0 to 23 cm, dry from 23 to 102 cm, and slightly moist from 102 to 152 cm. (Color is for dry soil unless otherwise noted.)
Ap--0 to 25 cm; brown (10YR 5/3) silt loam, dark brown (10YR 3/3) moist; weak very fine subangular blocky structure; slightly hard, very friable, nonsticky and slightly plastic; many very fine and common fine roots; many very fine irregular and common very fine and fine tubular pores; strongly effervescent; slightly alkaline (pH 7.8); clear wavy boundary. (18 to 40 cm thick)
Bk1--25 to 53 cm; light gray (10YR 7/2) silt loam, brown (10YR 5/3) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and few fine roots; common very fine and fine tubular pores; common fine calcium carbonate masses and threads; violently effervescent (25 percent calcium carbonate equivalent); moderately alkaline (pH 8.2); gradual wavy boundary.
Bk2--53 to 91 cm; very pale brown (10YR 7/3) silt loam, brown (10YR 5/3) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and few fine roots; common very fine and fine tubular pores; common fine calcium carbonate masses and threads; violently effervescent (16 percent calcium carbonate equivalent); strongly alkaline (pH 8.6); clear wavy boundary.
Bk3--91 to 127 cm; very pale brown (10YR 7/3) loam, brown (10YR 5/3) moist; weak very fine subangular blocky structure; slightly hard, very friable, nonsticky and slightly plastic; few very fine roots; common very fine irregular and tubular pores; common fine nodules very weakly cemented by calcium carbonate; strongly effervescent (12 percent calcium carbonate equivalent); strongly alkaline (pH 8.8); gradual wavy boundary. (Combined thickness of the Bk horizons is 102 to 142 cm thick)
C--127 to 152 cm; very pale brown (10YR 7/3) loam, yellowish brown (10YR 5/4) moist; massive; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and few fine tubular pores; strongly effervescent; strongly alkaline (pH 8.9).
TYPE LOCATION: Oneida County, Idaho; about 19 kilometers northwest of Malad City; about 366 meters west and 564 meters south of the northeast corner of section 6, T. 13 S., R. 35 E.; Daniels USGS topographic quadrangle; lat. 42 degrees, 19 minutes, 29 seconds N. and long. 112 degrees, 24 minutes, 25 seconds W., NAD83.
RANGE IN CHARACTERISTICS:
Mollic epipedon thickness: 18 to 40 cm Particle size control section total clay: 10 to 24 percent (weighted average of non-carbonate clay is less than 18 percent)
Control section carbonate clay: 2 to 14 percent
Control section non-carbonate clay: 10 to 18 percent
Control section sands coarser than very fine: 2 to 10 percent
Control section rock fragments: 0 to 3 percent Depth to calcic horizon: 18 to 40 cm
Depth to bedrock: 100 cm to greater than 152 cm
Calcium carbonate equivalent: 15 to 35 percent average in the calcic horizon
Mean annual soil temperature: 5.0 to 8.0 degrees C.
Mean summer soil temperature: 15.0 to 18.9 degrees C. (frigid soil temperature regime)
Ap horizons
Hue: 7.5YR or 10YR moist
Value: 4 or 5 dry, 2 or 3 moist
Chroma: 2 or 3, dry and moist
Reaction: slightly to strongly alkaline
Effervescence: slight to violent
Bk horizon
Hue: 10YR or 2.5Y, dry and moist
Value: 6 to 8 dry, 4 to 6 moist
Chroma: 2 to 4, dry and moist
Texture: SIL or L
Reaction: slightly to very strongly alkaline
Effervescence: strong to violent
Secondary carbonates: greater than 5 percent of carbonate masses, nodules, and veins
Cementation: weak cementation of insect casts in some horizons
Calcium carbonate equivalent: 10 to 35 percent
C horizon
Value: 7 or 8 dry, 4 to 6 moist
Chroma: 3 or 4, dry and moist
Texture: SIL or L
Reaction: slightly to very strongly alkaline
COMPETING SERIES: This is the Merkley series. Merkley soils are moderately well drained with redox features at depths of 100 to 152 cm.
GEOGRAPHIC SETTING:
Landscape: alluvial plains, outwash plains, plateau, hills, and foothills
Landform: hills, fan remnants, terraces, and lava fields
Elevation: 1400 to 2033 meters
Slope: 1 to 30 percent
Parent material: loess and silty alluvium
Mean annual air temperature: 2.2 to 7.2 degrees C.
Mean annual precipitation: 305 to 559 mm
Frost free period: 50 to 100 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cedarhill, Hondoho, Rexburg, Ririe, Kucera, and Watercanyon soils. Cedarhill and Hondoho soils are located in draws and have loamy-skeletal particle-size control sections. Rexburg, Ririe, and Kucera soils are found on similar landscapes as Iphil but are on linear to concave slopes; these soils are not calcareous in all parts of all horizons above the calcic horizon after the upper 18 cm of soil has been mixed. Watercanyon soils are also in similar landscape positions as Iphil but on more strongly convex south and west facing positions. Watercanyon soils have an ochric epipedon.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class: well
Runoff: medium
Saturated hydraulic conductivity: moderately high
USE AND VEGETATION:
Major uses: irrigated areas are used primarily for small grains, potatoes, hay and pasture; non-irrigated areas are used for pasture and range.
Dominant native vegetation: mountain big sagebrush, bluebunch wheatgrass, antelope bitterbrush, western wheatgrass, and eriogonum
DISTRIBUTION AND EXTENT:
Distribution: Southeastern Idaho and Western Wyoming, MLRA 13
Extent: the series is not extensive
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Oneida County, Idaho, 1994; Oneida County Area Soil Survey.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: from a depth of 0 to 25 cm
Calcic horizon: from a depth of 25 to 91 cm
Particle-size control section: from a depth of 25 to 100 cm
Surface effervescence: strong from a depth of 0 to 25 cm
Soil temperature regime: frigid
Soil moisture regime: xeric
ADDITIONAL DATA:
Lab data from NSSL, Lincoln, NE:
Typical pedon was not sampled.
Additional reference samples are PEDON ID:
S06ID-081-007
S89ID-029-005