LOCATION POLD ID

Established Series
Rev BDG/EMM
07/2013

POLD SERIES

The Pold series consists of very deep soils that are moderately deep to a fragipan. They are moderately well drained and found on hill slopes and interfluves. The soils formed in loess and Tertiary age alluvium with a thick mantle of volcanic ash. Saturated hydraulic conductivity is low in the fragipan, moderately low in the glossic horizon and moderately high and high in the overlying material. Slope ranges from 5 to 30 percent. The average annual temperature is about 6.5 degrees C. and the average annual precipitation is about 889 mm.

TAXONOMIC CLASS: Ashy over loamy, glassy over mixed, active, frigid Aquic Vitrixerands

TYPICAL PEDON: Pold ashy silt loam, forested, on a south facing (170 degrees) linear slope of 9 percent at an elevation of 868 meters. (Colors are for dry soil unless otherwise stated). When described on July 29 2009, the soil was dry throughout.

Oi -- 0 to 6 centimeters; slightly decomposed plant material; abrupt smooth boundary.

A -- 6 to 12 centimeters; brown (10YR 5/3) ashy silt loam, dark brown (10YR 3/3) moist; weak very fine granular structure; nonsticky and nonplastic; common very fine and coarse roots; neutral (pH 6.8); gradual wavy boundary. (5 to 13 centimeters thick)

Bw1 --- 12 to 29 centimeters; brown (7.5YR 5/4) ashy silt loam, dark yellowish brown (10YR 3/4) moist; weak fine and medium subangular blocky structure; nonsticky and nonplastic; common very fine and moderately few coarse and very coarse roots; neutral (pH 6.8); clear wavy boundary.

Bw2 -- 29 to 48 centimeters; light yellowish brown (10YR 6/4) ashy silt loam, dark yellowish brown (10YR 3/6) moist; moderate medium subangular blocky structure; nonsticky and nonplastic; common very fine and moderately few coarse and very coarse roots; neutral (pH 6.9); abrupt wavy boundary. (Combined thickness of the Bw horizons is 20 to 38 centimeters)

2E -- 48 to 72 centimeters; pale brown (10YR 6/3) silt loam, brown (10YR 5/3) moist; moderate medium subangular blocky structure; slightly sticky and moderately plastic; common very fine and moderately few medium roots between peds; common very fine and fine interstitial pores; 1 percent gravel; slightly acid (pH 6.3); clear wavy boundary. (0 to 24 centimeters thick)

2Bt/E -- 72 to 100 centimeters; Bt part is 70 percent yellowish brown (10YR 5/4) silt loam, brown (10YR 5/3) moist; E part is 30 percent light gray (10YR 7/2) light brownish gray (2.5Y 6/2) moist, moderate medium prismatic parting to moderate coarse subangular blocky structure; moderately sticky and very plastic; moderately few very fine and very few fine and medium roots between peds; common very fine and medium interstitial pores; 2 percent fine spherical iron-manganese concretions; 10 percent fine platy mica flakes; moderately acid, pH 5.7; clear irregular boundary. (17 to 48 centimeters thick)

Btxb1 -- 100 to 133 centimeters; light yellowish brown (10YR 6/4) silt loam; dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky and moderate very coarse prismatic structure; moderately sticky and very plastic; brittle; very few very fine roots between peds; common very fine tubular and interstitial pores; 8 percent manganese coatings; 15 percent fine platy mica flakes; strongly acid, pH 5.3; clear wavy boundary.

2Btxb2 -- 133 to 150 centimeters; very pale brown (10YR 7/4) loam; light olive brown (2.5Y 5/4) moist; moderate very coarse prismatic structure; moderately sticky and very plastic; brittle; very few very fine roots between peds; 10 percent manganese coatings on vertical faces of peds; 15 percent fine platy mica flakes; 1 percent gravel; strongly acid, pH 5.5.

TYPE LOCATION: Latah County, Idaho, about 3 miles north and 1.5 miles west of Troy, Idaho; about 1,685 feet west and 920 feet south of the northeast corner of section 26, T. 40 N., R. 4 W., Boise P.M.; Latitude - 46 degrees, 47 minutes, 7.0 seconds North; Longitude - 116 degrees, 47 minutes, 52.3 seconds West, NAD 83; UTM Zone 11, 515429m easting and 5181322m northing, NAD83; USGS Moscow Mountain Quadrangle.

RANGE IN CHARACTERISTICS:

Depth to fragipan - 51 to 102 cm
Soil moisture control section - usually dry for 45 to 60 consecutive days during June to October.
Xeric soil moisture regime.
Average annual soil temperature - 3.3 to 6.7 degrees C.
Frigid temperature regime.

Volcanic ash mantle thickness - 35 to 42 cm
Volcanic glass content in the 0.02 to 2.0 mm fraction - 15 to 60 percent
Acid-oxalate extractable Al plus 1/2 Fe - 1.3 to 2.7 percent
Phosphate retention - 75 to 90 percent
15-bar water retention on air dried samples - 4.5 to 14 percent (weighted average is less than 12 percent)
Moist bulk density - 0.60 to 0.90 g/cc

A horizon
Hue - 7.5YR or 10YR dry or moist
Value - 4 to 6 dry, 2.5 or 3 moist
Chroma - 2 to 4 dry and 3 or 4 moist
Texture - ashy silt loam
Clay content - 5 to 10 percent
Rock fragments - 0 to 1 percent gravel
Reaction - 5.8 to 6.8

Bw horizons
Hue - 7.5YR or 10YR dry or moist
Value - 5 or 6 dry, 3 to 5 moist
Chroma - 3 to 6 dry or moist
Texture - ashy silt loam
Clay content - 5 to 10 percent
Rock fragments - 0 to 1 percent gravel
Reaction - 5.6 to 6.8

2Bw horizons (present in some pedons)
Hue - 7.5YR or 10YR dry or moist
Value - 6 dry, 4 or 5 moist
Chroma - 4 dry, 3 or 4 moist
Texture - silt loam
Clay content - 15 to 20 percent
Rock fragments - 0 to 5 percent gravel
Reaction - 5.3 to 6.3

2E horizons (absent in some pedons)
Hue - 10YR dry and 7.5YR moist
Value - 6 or 7 dry and 4 or 5 moist
Chroma - 3 or 4 moist
Texture - silt loam
Clay content - 12 to 20 percent
Rock fragments - 0 to 1 percent gravel
Reaction - 5.3 to 6.5

2E/Bt and 2Bt/E horizons
E part:
Hue - 10 yr or 2.5Y moist
Value - 5 or 6 moist
Chroma - 2 or 3 dry or moist
Texture - silt loam
Clay content - 12 to 23 percent

B part:
Hue - 7.5yr or 10YR moist
Value - 5 or 6 dry, 4 or 5 moist
Chroma - 3 to 6 dry, 3 or 4 moist
Texture - silt loam or silty clay loam
Clay content - 17 to 28 percent
Rock fragments - 0 to 5 percent gravel
Reaction - 5.1 to 6.0

2Btx horizons
Hue - 7.5YR or 10YR dry or moist
Value - 5 to 7 dry, 3 to 6 moist
Chroma - 3 to 6 dry or moist
Textures - silt loam, loam or silty clay loam
Clay content - 18 to 30 percent
Rock fragments - 0 to 10 percent gravel
Reaction - 5.1 to 6.0

COMPETING SERIES: There are no competing series.

GEOGRAPHIC SETTING: The Pold soils are on hill slopes and interfluves. Slopes range from 5 to 30 percent. These soils formed in loess and Tertiary age alluvium with a thick mantle of volcanic ash at elevations of 823 to 1039 meters. The average annual temperature ranges from 5.0 to 8.0 degrees C, with an average annual precipitation of 790 to 990 mm. The frost free season is 90 to 130 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Neva, Hugus, Carrico and Teakean series. Neva soils are on hillslopes with a thinner volcanic ash mantle. They do not have a fragipan and have granitic residuum in the subsoil. Hugus soils are on mountain slopes. They do not have a fragipan and have more than 35 percent rock fragments in the subsoil. Carrico soils are on mountain slopes. They do not have a distinct ash cap and are moderately deep to a paralithic contact. Teakean soils are on mountain slopes. They do not have a distinct ash cap and are deep to a fragipan.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Moderately well drained; Saturated hydraulic conductivity is low in the fragipan, moderately low in the glossic horizon and moderately high and high in the overlying material.

USE AND VEGETATION: These soils are used for timber production, livestock grazing, wildlife habitat, watershed, and recreation. Potential natural vegetation is grand fir (Abies grandis), Douglas-fir (Pseudotsuga menziesii var. glauca), and ponderosa pine (Pinus ponderosa), with an understory of oceanspray (Holodiscus discolor), pinegrass (Calamagrostis rubescens), common snowberry (Symphoricarpos albus), mallow ninebark (Physocarpus malvaceus), dwarf rose (Rosa gymnocarpa) and starry Solomon's seal (Smilacina stellata)

DISTRIBUTION AND EXTENT: North-central Idaho. The series is not extensive. MLRA 43A.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: BOZEMAN, MONTANA

SERIES ESTABLISHED: Latah County, Idaho, 2013.

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

Ochric epipedon - The zone from 0 to 12 cm (Oi and A horizons).

Cambic horizon - The zone from 12 to 72 cm (Bw1, Bw2 and 2E horizons).

Argillic horizon - The zone from 72 to 150 cm (2Bt/E, 2Btxb1 and 2Btxb2 horizons).

Glossic horizon - The zone from 72 to 100 cm (2Bt/E horizon).

Fragipan - The zone from 100 to 150 cm (2Btxb1 and 2Btxb2 horizons).

Andic soil properties - The zone from 6 to 48 cm (A, Bw1 and Bw2 horizons).

Particle-size control section - The zone from 6 to 100 cm.

ADDITIONAL DATA: Laboratory data exists for this pedon:
Laboratory pedon number 09N1152 and user pedon ID number S09ID-057-012
Laboratory data exist for another pedon sampled as Pold but found to be outside the range of the series:
Laboratory pedon number 02N1043 and user pedon ID number S02ID-057-001

National Cooperative Soil Survey
U.S.A.