LOCATION KRUSE ID

Established Series
Rev. SMM-RWL-RJS
10/2016

KRUSE SERIES

The Kruse series consists of very deep, well drained soils on mountain slopes, canyon sides, ridges and hills. They formed in residuum weathered from granite, gneiss, and mica schist with a mantle of mixed ash and loess. Moderately high saturated hydraulic conductivity. Slope ranges from 0 to 75 percent. The average annual temperature is 44 degrees F. and the average annual precipitation is 30 inches.

TAXONOMIC CLASS: Fine-loamy, isotic, frigid Vitrandic Haploxeralfs

TYPICAL PEDON: Kruse ashy silt loam, forest, on an east-facing slope of 5 percent at 2,700 feet elevation. (Colors are for dry soil unless otherwise stated.)

Oi--0 to 2 inches; partially decomposed needles and twigs.

Oe--2 to 3 inches; decomposed needles and twigs. (O horizons 1 to 3 inches thick)

A--3 to 9 inches; grayish brown (10YR 5/2) ashy silt loam, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine to coarse roots; common very fine and fine irregular pores; moderately acid (pH 6.0); clear wavy boundary. (2 to 9 inches thick)

AB--9 to 16 inches; pale brown (10YR 6/3) ashy silt loam, brown (10YR 4/3) moist; weak medium and fine subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; many fine to coarse roots; common very fine and fine tubular pores; moderately acid (pH 5.8); clear wavy boundary. (0 to 19 inches thick)

Bt1--16 to 27 inches; pale brown (10YR 6/3) loam, brown (10YR 4/3) moist; weak medium prismatic structure parting to weak fine and medium subangular blocky; hard, very friable, slightly sticky and slightly plastic; common fine to coarse roots; common very fine and fine irregular and tubular pores; few faint clay films in pores; moderately acid (pH 5.8); clear wavy boundary. (7 to 11 inches thick)

Bt2--27 to 45 inches; very pale brown (10YR 7/3) clay loam, brown (10YR 5/3) moist; weak coarse prismatic structure parting to weak medium subangular blocky; hard, friable, moderately sticky and slightly plastic; few fine to coarse roots; common very fine and fine irregular and tubular pores; common distinct clay films in pores and on faces of peds; two lamellae 1/8 to 1/4 inch thick; about 3 percent fine gravel; moderately acid (pH 5.6); abrupt smooth boundary. (9 to 31 inches thick)

2BC1--45 to 59 inches; pale brown (10YR 6/3) fine sandy loam, brown (10YR 4/3) moist; weak coarse subangular blocky structur9e; hard, friable, slightly sticky and slightly plastic; few medium and coarse roots; few fine tubular pores; few faint clay films in pores; moderately acid (pH 5.6); gradual wavy boundary. (4 to 14 inches thick)

2BC2--59 to 75 inches; yellowish brown (10YR 5/4) fine sandy loam, dark yellowish brown (10YR 3/4) moist; massive; hard, friable; few faint clay films in pores; clay band 1/4 inch thick; few reddish brown and black iron-manganese concretions; 10 percent fine gravel; moderately acid (pH 5.6).

TYPE LOCATION: Kootenai County, Idaho; west of Mica; about 200 feet north and 2,400 feet west of the southeast corner of Section 1, T. 49 N., R. 5 W. Latitude - 47 degrees, 36 minutes, 54 seconds North; Longitude - 116 degrees, 55 minutes, 22 seconds West; USGS Rockford Bay quadrangle

RANGE IN CHARACTERISTICS:
Soil moisture - Usually dry for 45 to 70 consecutive days, moist November through July, dry August to October.
Average annual soil temperature - 41 to 46 degrees F.
Average summer soil temperature - 48 to 56 degrees F. with an 0 horizon (frigid temperature regime)
Depth to weathered bedrock - greater than 60 inches
Solum thickness - 40 to greater than 60 inches
Base saturation - 50 to 75 percent in the argillic horizons

A horizon
Hue - 7.5YR or 10YR dry or moist
Value - 3 to 6 dry, 2 to 4 moist
Chroma - 2 to 4, dry, 1 to 3 moist
Texture - ashy silt loam or ashy loam
Clay content - 5 to 20 percent
Rock fragments - 0 to 25 percent fine gravel
Reaction - strongly acid to neutral
Volcanic glass in the 0.02 to 2.0 mm fraction - 5 to 25 percent
Acid-oxalate extractable Al+1/2Fe - 0.4 to 1.0 percent

AB, Bw, or BA horizons
Hue - 7.5YR or 10YR dry or moist
Value - 4 to 7 dry, 2.5 to 4 moist
Chroma - 2 to 4 dry, 2 to 6 moist
Texture - ashy silt loam, ashy loam, ashy sandy loam, silt loam or loam
Clay content - 5 to 26 percent
Rock fragments - 0 to 20 percent fine gravel
Reaction - strongly acid to neutral
Volcanic glass in the 0.02 to 2.0 mm fraction - 5 to 25 percent
Acid-oxalate extractable Al+1/2Fe - 0.4 to 1.0 percent

EB horizons (where present)
Hue - 7.5YR or 10YR dry or moist
Value - 6 or 7 dry, 4 moist
Chroma - 3 or 4 dry, 3 to 6 moist
Texture - silt loam
Clay content - 20 to 24 percent
Rock fragments - 0 to 10 percent
Reaction - strongly acid or moderately acid

Bt and 2Bt horizons
Hue - 10YR or 7.5YR dry or moist
Value - 4 to 7 dry, 3 to 5 moist
Chroma - 2 to 6 dry, 3 to 8 moist
Texture - loam, silt loam, clay loam, sandy clay loam, or silty clay loam
Rock fragments - 0 to 75 percent gravel, 0 to 35 percent cobbles, 0 to 75 percent total fragments (weighted average of the particle size control section is less than 35 percent)
Clay content - 15 to 36 percent (weighted average of the particle size control section is less than 35 percent)
Reaction - very strongly acid to neutral

2BC or 2BCt horizons
Hue - 5YR to 10YR dry or moist
Value - 5 to 8 dry, 3 to 5 moist
Chroma - 2 to 6 dry or moist
Texture - loam, silt loam, fine sandy loam, sandy loam, sandy clay loam, coarse sandy loam or clay loam
Clay content - 10 to 32 percent
Rock fragments - 0 to 30 percent gravel, 0 to 5 percent cobbles
Reaction - very strongly acid to neutral

2C horizons (where present)
Hue - 2.5Y to 2.5YR dry or moist
Value - 4 to 8 dry, 3 to 8 moist
Chroma - 1 to 8 dry or moist
Textures - loam, fine sandy loam, sandy loam, coarse sandy loam, loamy fine sand or loamy sand
Clay content - 3 to 25 percent
Rock fragments - 0 to 60 percent gravel, 0 to 15 percent cobbles, 0 to 60 percent total fragments
Mica fragments - 0 to 15 percent
Reaction - very strongly acid to moderately acid

COMPETING SERIES:
Carrico soils: are moderately deep to a paralithic contact
Eaglelake soils: are deep to a paralithic contact
Ketchly soils: are deep and very deep; have umbric epipedons 10 to 20 inches thick
Mcewen soils: formed in mixed alluvium; found only on alluvial terraces
Nahahum soils: has an E horizon above the argillic
Nard soils: has an albic and/or glossic horizon
Nardmont soils: has an albic horizon
Neuske soils: has albic horizons
Panak soils: has basalt fragments in the subsoil and acid oxalate extractable Al + 1/2 Fe of 1 to 2 percent

GEOGRAPHIC SETTING: Kruse soils are on mountain slopes, canyon sides, ridges and hills. Slopes range from 0 to 75 percent. These soils formed in residuum weathered from granite, gneiss, or mica schist with a mantle of loess and minor amounts of volcanic ash at elevations of 1,600 to 4,700 feet (488 to 1433 meters). The average annual temperature ranges from 40 to 46 degrees F., with an average annual precipitation of 25 to 43 inches (635 to 1092 mm). The average frost-free period is from 80 to 130 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ardtoo, Lenz, Melder, Ulricher, Vassar, and Blackprince soils. Ardtoo and Blackprince soils are on east and west-facing convex mountain slopes and do not have argillic horizons. Lenz and Ulricher soils are on south-facing mountain slopes and are mesic. Melder soils are on south-facing mountain footslopes, are loamy-skeletal, and have bedrock at 40 to 60 inches. Vassar soils are on north-facing mountain slopes and have volcanic ash surface horizons.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; Moderately high saturated hydraulic conductivity.

USE AND VEGETATION: These soils are used for timber production, livestock grazing, wildlife habitat, recreation, and watershed. Some cleared areas are used for the production of small grains, grass seed, hay, and pasture. Potential natural vegetation is mainly grand fir, Douglas-fir, western white pine, ponderosa pine, western larch, and lodgepole pine, with an understory of myrtle pachystima, Columbia brome, American trailplant, baldhip rose, starry false-Solomon's-seal, sweetscented bedstraw, pine reedgrass, common snowberry, elk sedge, mallow ninebark, creambush oceanspray, and white spirea.

DISTRIBUTION AND EXTENT: Northern Idaho and eastern Washington. This soil is moderately extensive. MLRA 43.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana

SERIES ESTABLISHED: Kootenai County, Idaho, 1976

REMARKS: Diagnostic horizons and other features recognized in this pedon:
Ochric epipedon - The zone from 0 to 9 inches (Oi, Oe and A horizons).
Argillic horizon - The zone from 16 to 45 inches (Bt horizons).
Vitrandic feature - The zone from 3 to 16 inches (A and AB horizons).
Particle-size control section - The zone from 16 to 36 inches (Bt1 and part of Bt2 horizon).

The ranges in values listed under the A and AB horizons for Volcanic glass content and Acid-oxalate extractable Al+1/2Fe are estimates only.

National Cooperative Soil Survey
U.S.A.