LOCATION KIMAMA                  ID+WA

Established Series
Rev. JEB/KDPL/SBC
09/2019

KIMAMA SERIES

Landscape--plateaus
Landform--drainageways, depressions, structural benches
Slope--0 to 35 percent
Parent material--local alluvium and loess
Mean annual precipitation--about 250 mm
Mean annual air temperature--about 10 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--aridic
Soil temperature regime--mesic
Soil moisture subclass--xeric

TAXONOMIC CLASS: Fine-silty, mixed, superactive, mesic Calciargidic Argixerolls

TYPICAL PEDON: Kimama silt loam in an area of rangeland

A1--0 to 10 cm; silt loam, brown (10YR 5/3) dry, very dark grayish brown (10YR 3/2) moist; weak very thin platy structure that parts to weak very fine granular; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and few fine roots; many very fine interstitial and tubular pores; slightly acid (pH 6.5); abrupt smooth boundary

A2--10 to 20 cm; silt loam, brown (10YR 5/3) dry, very dark grayish brown (10YR 3/2) moist, dark brown (10YR 3/3) moist and crushed; very weak medium prismatic structure that parts to weak very fine granular; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and fine and few medium roots; common very fine tubular pores; neutral (pH 6.6); clear smooth boundary

Bt1--20 to 43 cm; silt loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; very weak medium prismatic structure that parts to moderate very fine and fine subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; common very fine and few fine roots; many very fine tubular pores; few faint patchy clay films on vertical and horizontal faces of peds and in pores; few hard (cicada) krotovinas; neutral (pH 6.8); clear smooth boundary

Bt2--43 to 69 cm; silt loam, brown (10YR 5/3) dry, pale brown (10YR 6/3) crushed, brown (10YR 4/3) moist; moderate very fine and fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine and few fine and medium roots; common very fine tubular pores; few faint patchy clay films on vertical and horizontal faces of peds and in pores; many hard (cicada) krotovinas; neutral (pH 6.9); clear smooth boundary

Bt3--69 to 84 cm; silt loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; moderate very fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine roots; common very fine tubular pores; few faint clay films on faces of peds and in pores; common hard (cicada) krotovinas; slightly effervescent; slightly alkaline (pH 7.6); clear wavy boundary

Bk1--84 to 109 cm; silt loam, light gray (10YR 7/2) dry, grayish brown (10YR 5/2) moist; weak fine and medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; few very fine roots; many very fine tubular pores; common (cicada) krotovinas; violently effervescent, many fine veins and few coatings of lime; moderately alkaline (pH 7.9); clear wavy boundary

Bk2--109 to 137 cm; silt loam, light gray (10YR 7/2) dry, grayish brown (10YR 5/2) moist; very weak medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; few very fine roots; many very fine tubular pores; few (cicada) krotovinas; violently effervescent, many fine veins and few coatings of lime; moderately alkaline (pH 7.9); clear wavy boundary

Bkb--137 to 163 cm; silt loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; very weak coarse subangular blocky structure; hard, friable, slightly sticky and slightly plastic; few very fine roots; many very fine tubular pores; few (cicada) krotovinas; strongly effervescent, common fine veins and few coatings of lime; moderately alkaline (pH 7.9); clear smooth boundary

TYPE LOCATION: Blaine County, Idaho, about 2.5 km southeast of Minidoka; latitude 43 degrees, 42 minutes, 28 seconds north and longitude 113 degrees, 27 minutes, 12 seconds west

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--9 to 13 degrees C
Thickness of mollic epipedon--18 to 46 cm
Depth to calcic horizon--51 to 109 cm

A horizon (where mixed to depth of 20 cm)
Value--4 or 5 dry, 2 or 3 dry
Chroma--2 or 3 dry or moist
Organic matter content--1 to 2 percent
Reaction--6.6 to 7.8
Combined thickness--13 to 46 cm

Bt horizon
Value--4 to 6 dry, 3 or 4 moist
Chroma--2 to 4 dry or moist
Clay content--18 to 25 percent
Reaction--6.6 to 8.4
Combined thickness--23 to 76 cm

Bk horizon
Value--5 to 7 dry, 3 to 5 moist
Chroma--2 to 6 dry or moist
Calcium carbonate equivalent--15 to 25 percent
Texture--loam, silt loam
Content of hard nodules of soil material or cicada krotovinas--0 to 20 percent
Combined thickness--13 to 102 cm

Bkb horizon
Thickness--0 to 25 cm

COMPETING SERIES:
Hamrub--100 to 125 cm (deep) to a duripan
Marley--100 to 150 cm (deep) to a duripan
Polecat--carbonates at a depth of 30 to 50 cm; 100 to 150 cm (deep) to a paralithic contact (lacustrine deposits)
Rockspring--50 to 100 cm (moderately deep) to a lithic contact (basalt)

GEOGRAPHIC SETTING:
Elevation--910 to 1375 m in Idaho, 460 to 1025 m in Washington
Climate--semiarid; dry summers
Mean annual precipitation--200 to 310 mm, including 300 to 910 cm of snow; most areas also receive runoff from adjacent slopes
Mean annual air temperature--8 to 12 degrees C
Frost-free period--80 to 145 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Caliralls--more than 15 percent fine sand or coarser material in particle-size control section
Minidoka, Portino, Portneuf, Trevino--no mollic epipedon or argillic horizon
Wipple--45 to 60 percent clay in particle-size control section; 100 to 150 cm or more (deep and very deep) to a lithic contact (basalt)

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--moderately high

USE AND VEGETATION:
Use--mainly irrigated crop production
Principal crops--sugar beets, beans, small grain, hay, pasture
Natural vegetation--Wyoming big sagebrush, basin wildrye, streambank wheatgrass, bluebunch wheatgrass, Sandberg bluegrass

DISTRIBUTION AND EXTENT: Southern Idaho and central Washington; MLRA 8; small extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Blaine County, Idaho; 1972

REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Mollic epipedon--zone from the surface to a depth of 43 cm
*Argillic horizon--zone from 20 to 84 cm
*Calcic horizon--zone from 84 to 150 cm
*Particle-size control section--zone from 20 to 70 cm

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National Cooperative Soil Survey
U.S.A.