LOCATION KONKOL                  ID

Established Series
Rev. BDG-JAL-EMM
07/2013

KONKOL SERIES

The Konkol series consists of very deep, well drained, moderately permeable soils that formed in volcanic ash, alluvium and lacustrine sediments. They are on hills on plateaus and low mountain ridges and have slopes of 5 to 45 percent. The average annual precipitation is about 40 inches and the average annual temperature is about 42 degrees F.

TAXONOMIC CLASS: Fine-loamy, mixed, active, frigid Andic Hapludalfs

TYPICAL PEDON: Konkol ashy silt loam, forested, on a 45 percent slope, on a northerly aspect at an elevation of 3,280 feet. Colors are for dry soil unless otherwise noted.

Oe--0 to 2 inches; decomposed leaves, needles, twigs and moss. (O horizons 1 to 3 inches thick)

A--2 to 3 inches; dark yellowish brown (10YR 4/4) ashy silt loam, dark brown (10YR 3/3) moist; weak very fine and fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine and common medium roots; few very fine tubular pores; 2 percent rounded quartz gravel; strongly acid (pH 5.1); abrupt smooth boundary. (1 to 8 inches thick)

Bw--3 to 10 inches; brown (7.5YR 5/4) ashy silt loam, dark brown (7.5YR 3/4) moist; weak fine and medium subangular blocky structure parting to weak very fine and fine granular; soft, very friable, nonsticky and nonplastic; many very fine and fine and common medium and coarse roots; few very fine tubular pores; 5 percent rounded quartz gravel; strongly acid (pH 5.4); abrupt smooth boundary. (0 to 10 inches thick)

2Bt1--10 to 18 inches; very pale brown (10YR 7/4) gravelly loam, 95 percent brown (7.5YR 5/4) and 5 percent strong brown (7.5YR 5/6) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and moderately plastic; common very fine and fine and few medium and coarse roots between peds; common fine and medium tubular pores; common faint discontinuous clay films on faces of peds and in pores; 15 percent rounded quartz gravel; moderately acid (pH 5.6); clear wavy boundary.

2EB--18 to 25 inches; 90 percent very pale brown (10YR 8/2) and 10 percent very pale brown (10YR 8/4) very fine sandy loam, 90 percent brown (7.5YR 5/4) and 10 percent reddish yellow (7.5YR 6/6) moist; moderate fine and medium subangular blocky structure; moderately hard, friable, slightly sticky and moderately plastic; common very fine and fine roots between peds; many very fine and common fine tubular pores; common faint clay films lining pores; very strongly acid (pH 4.5); abrupt wavy boundary. (0 to 7 inches thick)

2Bt2--25 to 29 inches; reddish yellow (7.5YR 7/6) silt loam, reddish yellow (7.5YR 6/8) moist; strong fine and medium subangular blocky structure; moderately hard, friable, slightly sticky and moderately plastic; many very fine and fine and few medium roots between peds; common very fine and fine tubular pores; many distinct continuous clay films on faces of peds and in pores; many faint discontinuous skeletans on faces of peds; very strongly acid (pH 4.5); abrupt wavy boundary.

2Bt3--29 to 48 inches; 90 percent very pale brown (10YR 8/3) and 10 percent reddish yellow (7.5YR 7/6) silt loam, 90 percent very pale brown (10YR 7/4) and 10 percent reddish yellow (7.5YR 6/8) moist; strong fine and medium angular blocky structure; very hard, firm, moderately sticky and moderately plastic; common very fine and fine roots between peds; few very fine tubular pores; many distinct continuous clay films on faces of peds and in pores; few faint discontinuous skeletans on faces of peds; 5 percent fine mica flakes; very strongly acid (pH 4.5); clear wavy boundary.

2Bt4--48 to 56 inches; 95 percent very pale brown (10YR 8/4) and 5 percent brownish yellow (10YR 6/8) sandy clay loam, 90 percent yellow (10YR 7/6) and 10 percent strong brown (7.5YR 5/8) moist; moderate fine and medium subangular blocky structure; very hard, friable, slightly sticky and moderately plastic; few very fine and fine roots between peds; few very fine tubular pores; many continuous distinct clay films on faces of peds and in pores; many continuous distinct skeletans on faces of peds; 10 percent fine mica flakes; extremely acid (pH 4.2); clear wavy boundary.

2Bt5--56 to 64 inches; 95 percent very pale brown (10YR 7/4) and 5 percent brownish yellow (10YR 6/8) very fine sandy loam, 95 percent yellow (10YR 7/6) and 5 percent strong brown (7.5YR 5/8) moist; moderate fine and medium subangular blocky structure; very hard, friable, slightly sticky and moderately plastic; few very fine and fine roots between peds; few very fine tubular pores; many continuous distinct clay films on faces of peds and in pores; many continuous distinct skeletans on faces of peds; 10 percent fine mica flakes; extremely acid (pH 4.3); clear wavy boundary.

2BC--64 to 68 inches; very pale brown (10YR 8/4) fine sandy loam, yellow (10YR 7/6) moist; weak fine and medium subangular blocky structure; moderately hard, friable, slightly sticky and moderately plastic; few very fine and fine roots between peds; few very fine tubular pores; common patchy distinct skeletans on faces of peds; extremely acid (pH 4.1).

TYPE LOCATION: Clearwater County, Idaho. About 2 miles north and 5 miles west of Headquarters, Idaho; about 1,750 feet north and 1,450 feet east of the southwest corner of sec. 2, T38N, R4E; Latitude - 46 degrees, 39 minutes, 48 seconds North; Longitude - 115 degrees, 55 minutes, 17 seconds West; USGS John Lewis Mountain Quadrangle.

RANGE IN CHARACTERISTICS:

Average annual soil temperature - 43 to 46 degrees F.
Frigid temperature regime
Soil moisture control section - usually moist year-round and not dry for 45 consecutive days between June and October
Udic moisture regime
Thickness of volcanic ash mantle - 8 to 12 inches

A horizon
Hue - 7.5YR or 10YR dry or moist
Value - 4 or 5 dry, 2.5 or 3 moist
Chroma - 2 to 4 dry or moist
Textures - ashy silt loam or ashy loam
Clay content - 8 to 16 percent
Rock fragments - 0 to 2 percent gravel
Reaction - strongly acid to neutral
Bulk density - 0.65 to 0.95 g/cc
Acid oxalate Al plus 1/2 Fe - 1.20 to 2.25 percent

Bw horizon
Hue - 7.5YR or 10YR dry
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 3 or 4 moist
Textures - ashy-silt loam or ashy loam
Clay content - 8 to 18 percent
Rock fragments - 0 to 5 percent gravel
Reaction - strongly acid to neutral
Bulk density - 0.75 to 1.20 g/cc
Acid oxalate Al plus 1/2 Fe - 1.20 to 2.35 percent

2BE or 2EB horizons
Hue - 7.5YR or 10YR dry or moist
Value - 7 or 8 dry, 4 to 6 moist
Chroma - 2 to 4 dry, 3 to 6 moist
Textures - loam, silt loam or very fine sandy loam
Clay content - 17 to 23 percent
Rock fragments - 0 to 2 percent gravel
Reaction - very strongly acid to moderately acid

2B/E or 2E/B horizons (present in some pedons)
B part:
Hue - 7.5YR or 10YR dry, 5YR to 10YR moist
Value - 6 dry, 4 or 5 moist
Chroma - 4 or 5 dry, 4 to 6 moist
Textures - silt loam or loam
Clay content - 19 to 21 percent
E part:
Hue - 7.5YR to 2.5Y
Value - 6 or 7 dry, 4 to 6 moist
Chroma - 3 to 6 dry, 4 to 6 moist
Textures - silt loam, loam or fine sandy loam
Clay content - 10 to 17 percent
Reaction - very strongly acid to neutral
Rock fragments - 0 to 2 percent gravel

2Bt horizons
Hue - 5YR to 10YR dry, 5YR to 2.5Y moist
Value - 6 to 8 dry, 3 to 7 moist
Chroma - 2 to 8 dry or moist
Textures - loam, silt loam, sandy clay loam, sandy loam, silty clay loam, clay loam, or very fine sandy loam
Clay content - 17 to 36 percent
Rock fragments - 0 to 45 percent gravel, 0 to 5 percent cobbles, 0 to 45 percent total rock fragment content (weighted average for the particle size control section is less than 35 percent)
Reaction - extremely acid to neutral

2BC horizons (present in some pedons)
Hue - 7.5YR or 10YR
Value - 5 to 8 dry, 4 to 7 moist
Chroma - 4 or 6 dry, 3 to 6 moist
Textures - loam, silt loam, fine sandy loam or sandy loam
Clay content - 12 to 22 percent
Rock fragments - 0 to 10 percent gravel
Reaction - extremely acid to strongly acid

2C horizons (present in some pedons)
Hue - 7.5YR to 2.5Y dry, 2.5YR to 10YR moist
Value - 5 to 7 dry, 4 to 7 moist
Chroma - 4 or 6 dry, 2 to 8 moist
Textures - loam, sandy clay loam, silty clay loam, fine sandy loam, or sandy loam
Clay content - 5 to 32 percent
Rock fragments - 0 to 15 percent gravel
Reaction - very strongly acid or strongly acid

COMPETING SERIES: These are the Jaype and Hildebrand series. Jaype soils are slowly permeable in some layer in the subsoil and have buried argillic horizons. Hildebrand soils are moderately well drained with redox features at 12 inches.

GEOGRAPHIC SETTING: Konkol soils are on uhills on plateaus and low ridges at elevations of 3000 to 3,550 feet. Slopes range from 5 to 45 percent. These soils formed in alluvium and lacustrine sediments thinly mantled by volcanic ash. The average annual air temperature is 38 to 44 degrees F. and the average annual precipitation is 30 to 55 inches. The frost-free season ranges from 50 to 110 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Grangemont, Kauder, Revling and Statemeadow series. Grangemont soils are on undulating plateaus and are fine-silty. Kauder soils are on undulating plateaus and have a fragipan. Revling soils are on undulating plateaus and have a thick ash cap. Statemeadow soils are on undulating plateaus and have a highly mixed ash cap.

DRAINAGE AND PERMEABILITY: Well drained; medium runoff; moderate permeability.

USE AND VEGETATION: These soils are used primarily for timber production, livestock grazing, wildlife habitat and watershed. The natural vegetation is mainly western redcedar, grand fir, Douglas fir, western larch and western white pine with an understory of queencup beadlily, goldthread, longtube twinflower, bunchberry dogwood, rocky mountain maple and common snowberry.

DISTRIBUTION AND EXTENT: North central Idaho; Konkol soils are not extensive. MLRA 43A.

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

SERIES ESTABLISHED: Clearwater County, Idaho, 2003.

REMARKS: Diagnostic horizons and other features recognized in this pedon are:

Ochric epipedon - The zone from the 0 to 3 inches (Oe and A horizons).

Cambic horizon - The zone from 3 to 10 inches (Bw horizon).

Volcanic ash cap - The zone from the mineral soil surface to 10 inches (A and Bw horizons).

Argillic horizon - The zone from 10 to 64 inches (2Bt1, 2EB, 2Bt2, 2Bt3, 2Bt4, and 2Bt5 horizons).

Particle size control section - The zone from the top of the argillic horizon to 30 inches (2Bt1, 2EB, 2Bt2 and part of the 2Bt3 horizons).

The ranges in values listed under the A and Bw horizons for Bulk density and Acid-oxalate extractable Al+1/2Fe are estimates only.

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National Cooperative Soil Survey
U.S.A.