LOCATION KRENKA NV
Established Series
Rev. PWB-RLB-JVC-JBF
02/2019
KRENKA SERIES
The Krenka series consists of very deep, well drained soils that formed in alluvium derived from mixed rocks. Krenka soils are on fan remnants. Slopes are 4 to 30 percent. The mean annual precipitation is about 460 mm and the mean annual temperature is about 6 degrees C.
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Pachic Argixerolls
TYPICAL PEDON: Krenka loam--rangeland. (Colors are for dry soil unless otherwise noted.) The soil surface is covered with 20 percent gravel and 5 percent cobbles.
A1--0 to 5 cm; brown (10YR 5/3) loam, black (10YR 2/1) moist; moderate fine granular structure; soft, very friable, slightly sticky and slightly plastic; few very fine, fine and medium roots; few very fine, fine and medium interstitial pores; 10 percent gravel; neutral (pH 6.6); clear wavy boundary. (5 to 13 cm thick)
A2--5 to 43 cm; brown (10YR 5/3) loam, black (10YR 2/1) moist; moderate medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common fine and medium roots; common very fine, medium and few coarse interstitial and tubular pores; 10 percent gravel; neutral (pH 6.6); gradual smooth boundary. (18 to 38 cm thick)
Bt1--43 to 56 cm; brown (10YR 5/3) gravelly sandy clay loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; many fine and medium roots; few faint clay films on faces of peds and lining pores; many very fine and medium interstitial and tubular pores; 25 percent gravel; neutral (pH 6.6); clear smooth boundary. (10 to 20 cm thick)
Bt2--56 to 79 cm; grayish brown (10YR 5/2) gravelly sandy clay loam, very dark grayish brown (10YR 3/2) moist; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine medium roots; many very fine, fine and common medium tubular and interstitial pores; common distinct clay films on faces of peds and lining pores; 30 percent gravel; neutral (pH 6.6); clear smooth boundary. (18 to 28 cm thick)
2Bt3--79 to 150 cm; yellowish brown (10YR 5/4) extremely cobbly sandy clay loam, dark yellowish brown (10YR 3/4) moist; moderate medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine medium roots; many very fine and common fine interstitial and tubular pores; common faint clay films on faces of peds and lining pores; 40 percent gravel, 20 percent cobbles, and 10 percent stones; slightly acid (pH 6.4).
TYPE LOCATION: Elko County, Nevada; about 18.25 miles east of Halleck in Secret Valley; approximately 1,500 feet south and 2,000 feet west of the northeast corner of section 3, T. 34 N., R. 60 E.; USGS Secret Valley 7.5 minute topographic quadrangle; 40 degrees 51 minutes 38 seconds north latitude and 115 degrees 11 minutes 13 seconds west longitude, WGS84 Decimal Degrees 40.8605472 latitude, -115.1869444 longitude.
RANGE IN CHARACTERISTICS:
Soil moisture: Usually moist in the moisture control section in winter and spring, dry in summer and fall; Xeric moisture regime that borders on aridic.
Mean annual soil temperature: 6 to 8 degrees F.
Mollic epipedon thickness: 50 to 89 cm; includes the Bt1 and Bt2 horizons.
Depth to argillic horizon: 38 to 50 cm.
Depth to base of argillic horizon: 114 to more than 150 cm.
Depth to bedrock: More than 200 cm.
Particle-size control section - Clay content: 20 to 25 percent.
Rock fragments: Averages 35 to 50 percent, mainly gravel in the upper horizons and cobbles in the lower subhorizon.
A horizons
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 2 or 3 dry, 1 or 2 moist.
Organic matter content: 2 to 4 percent.
Bt1 and Bt2 horizons
Chroma: 2 or 3, dry or moist.
Texture: Gravelly sandy clay loam or very gravelly sandy clay loam.
Clay content: 20 to 25 percent.
Rock fragments: 25 to 40 gravel, 0 to 5 percent cobbles.
Consistence: Soft or slightly hard.
Organic matter content: 1 to 3 percent.
2Bt3 horizons
Value: 5 through 8 dry, 3 through 5 moist.
Texture: Very cobbly sandy clay loam or extremely cobbly sandy clay loam.
Clay content: 20 to 25 percent.
Rock fragments: 35 to 40 percent gravel, 10 to 20 percent cobbles, 0 to 10 percent stones.
Consistence: Soft or slightly hard.
Reaction: Slightly acid or neutral.
COMPETING SERIES: These are the
Bullump,
Bullvaro,
Burchflat,
Camelback,
Chrisflat,
Dogbed,
Dooh,
Erig, Krenka,
Leroman,
Lockgate,
Murain,
Nutval,
Snyderville,
Softback,
Softscrabble,
Staberg,
Vetagrande, and
Vipont series.
Bullump soils have 25 to 35 percent clay in the particle-size control section and have lithic contacts between 100 and 200 cm from the soil surface.
Bullvaro,
Dooh,
Nutval, and
Vetagrande soils have an aridic moisture regime.
Burchflat and
Vipont soils are moderately deep to lithic contacts.
Camelback soils have lithic contacts between 100 and 200 cm from the soil surface and have fine-earth texture of silt loam throughout.
Chrisflat soils do not have less than 35 percent rock fragments in the upper part of the argillic horizon.
Dogbed soils do not have less than 35 percent rock fragments in the upper part of the argillic horizon and have paralithic contacts between 150 and 200 cm from the soil surface.
Erig soils are deep to lithic contacts.
Leroman and
Staberg soils are moderately deep to paralithic contacts.
Lockgate soils are deep to paralithic contacts.
Murain soils are dominated by stones and cobbles and average 60 to 80 percent rock fragments in the particle-size control section.
Snyderville soils have depth to base of the argillic horizon of less than 36 cm.
Softback soils average 25 to 32 percent clay in the particle-size control section and have mollic epipedons that do not include the upper Bt horizons.
Softscrabble soils average 27 to 35 percent clay in the particle-size control section and typically have paralithic contacts between 150 and 200 cm from the soil surface.
GEOGRAPHIC SETTING: Krenka soils are on fan remnants. These soils formed in alluvium derived from mixed rocks. Slopes are 4 to 30 percent. Elevations range from 1,895 to 2,135 meters. The climate is semiarid with cool, moist winters and warm, dry summers. The mean annual precipitation is 410 to 510 mm, the mean annual temperature is 5 to 7 degrees C, and the frost-free period is 70 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing
Bullump soil and the
Cleavage,
Secrepass, and
Welch soils. Cleavage are shallow to lithic contacts. Secrepass soils are clayey-skeletal and have an abrupt increase in clay content at the top of the argillic horizon. Welch soils are fine-loamy, have endosaturation which is very shallow or shallow, and do not have argillic horizons.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; medium surface runoff; moderate saturated hydraulic conductivity.
USE AND VEGETATION: Krenka soils are used for rangeland and wildlife habitat. The present vegetation is mainly mountain big sagebrush, antelope bitterbrush, snowberry, basin wildrye, Idaho fescue, and Columbia needlegrass.
DISTRIBUTION AND EXTENT: Northeastern Nevada. These soils are not extensive with about 2,100 acres of the series mapped to date. MLRA 25.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California.
SERIES ESTABLISHED: Elko County (Southeast Part), Nevada, 1994.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - The zone from the soil surface to 79 cm (A1, A2, Bt1, and Bt2 horizons).
Argillic horizon - The zone from 43 to 150 cm (Bt1, Bt2, and 2Bt3 horizons).
Particle-size control section - The zone from 43 to 94 cm (Bt1 and Bt2 horizons and part of the 2Bt3 horizon).
National Cooperative Soil Survey
U.S.A.