LOCATION MADTURKEY               CA

Established Series
Rev.: JTB/JWH/ET
10/2016

MADTURKEY SERIES

The Madturkey series consists of very deep, moderately well drained soils formed in colluvium and residuum derived from siltstone. Madturkey soils are on mountains. Slopes range from 30 to 50 percent. Mean annual precipitation is about 1650 millimeters and the mean annual temperature is about 11 degrees C.

TAXONOMIC CLASS: Fine, mixed, superactive, isomesic Aquultic Haplustalfs

TYPICAL PEDON: Madturkey silt loam on a north facing 32 percent slope under Douglas-fir, tanoak, Pacific madrone, redwood, and California bay at an elevation of 305 meters. (Colors are for dry soil unless otherwise noted.) When described on 09/20/07, the soil was moist from 60 to 200 centimeters.

Oi--0 to 4 centimeters; very dark gray (10YR 3/1) slightly decomposed plant material, black (10YR 2/1) moist; 100 percent fibers, 60 percent rubbed; moderately acid (pH 6.0); abrupt smooth boundary. (0 to 5 centimeters thick)

A--4 to 14 centimeters; brown (10YR 5/3) silt loam, very dark grayish brown (10YR 3/2) moist; moderate very fine subangular blocky structure; moderately hard, friable, slightly sticky and slightly plastic; common very fine, fine, and medium roots throughout; few very fine, fine, medium and coarse tubular pores; 2 percent paragravel; slightly acid (pH 6.5); clear wavy boundary. (5 to 25 centimeters thick)

AB--14 to 42 centimeters; pale brown (10YR 6/3) silt loam, brown (10YR4/3) moist; moderate fine subangular blocky structure; moderately hard, friable, moderately sticky and moderately plastic; common very fine, fine, medium, and coarse roots throughout; common very fine, fine, medium, and coarse tubular pores; 5 percent paragravel; moderately acid (pH 5.7); clear wavy boundary. (0 to 25 centimeters thick)

Bt--42 to 63 centimeters; light yellowish brown (10YR 6/4) silty clay loam, dark yellowish brown (10YR 4/4) moist; moderate fine subangular blocky structure; very hard, firm, moderately sticky and moderately plastic; few very fine, fine, and common medium and coarse roots throughout; common very fine, fine, and few medium and coarse tubular pores; 5 percent faint clay films on all faces of peds; 10 percent paragravel; strongly acid (pH 5.5); clear wavy boundary.

Btg1--63 to 80 centimeters; light yellowish brown (10YR 6/4) paragravelly silty clay loam, dark yellowish brown (10YR 4/4) moist; moderate very fine and fine subangular blocky structure; very hard, firm, moderately sticky and moderately plastic; few very fine, fine, and many medium, coarse, and very coarse roots throughout; common very fine, fine, and few medium and coarse tubular pores; 40 percent faint clay films on all faces of peds; 10 percent fine prominent irregular gray (2.5Y 5/1) moist iron depletions in the matrix and 10 percent fine distinct irregular strong brown (7.5YR 4/6) moist iron-manganese masses in the matrix; 15 percent weakly cemented siltstone paragravels; moderately acid (pH 5.6); clear wavy boundary.

Btg2--80 to 130 centimeters; light yellowish brown (10YR 6/4) silty clay, dark yellowish brown (10YR 4/4) moist; moderate fine and medium subangular blocky structure; very hard, firm, moderately sticky and moderately plastic; few very fine, fine, many medium, and common coarse roots throughout; common very fine, fine, medium, and coarse tubular pores; 40 percent faint clay films on all faces of peds; 30 percent fine prominent irregular gray (2.5Y 5/1) moist iron depletions in the matrix and 30 percent fine distinct irregular strong brown (7.5YR 4/6) moist iron-manganese masses in the matrix; 2 percent paragravel; strongly acid (pH 5.4); clear wavy boundary.

BCtg--130 to 150 centimeters; light yellowish brown (10YR 6/4) silty clay loam, dark yellowish brown (10YR 4/4) moist; weak fine subangular blocky structure; very hard, firm, moderately sticky and moderately plastic; few very fine, fine, and common medium roots throughout; common very fine, fine, and common medium and coarse tubular pores; 10 percent faint clay films on all faces of peds; 30 percent fine prominent irregular gray (2.5Y 5/1) moist iron depletions in the matrix and 30 percent fine distinct irregular strong brown (7.5YR 4/6) moist iron-manganese masses in the matrix; 2 percent paragravel; strongly acid (pH 5.4); clear wavy boundary. (Combined thickness of the Bt horizons is 100 to 195 centimeters)

Cg--150 to 200 centimeters; light brownish gray (2.5Y 6/2) silty clay loam, dark gray (2.5Y 4/1) moist; massive; very hard, firm, moderately sticky and very plastic; few very fine, fine, and medium roots throughout; few very fine and fine tubular pores; 50 percent fine distinct irregular strong brown (7.5YR 4/6) moist, iron-manganese masses in the matrix; 8 percent paragravel; moderately acid (pH 5.6). (0 to 50 centimeters thick)

TYPE LOCATION: Humboldt County, California; about 5 kilometers northwest of the town of Redway, CA, USGS Miranda Quadrangle, CA; WGS84 Decimal degrees 40.1577556 latitude and -123.8571750 longitude; UTM zone 10 427000mE, 4445619mN; NAD 83.

RANGE IN CHARACTERISTICS:

Soil Temperature: The mean annual soil temperature at 50 centimeters is 9 to 11 degrees C. (48 to 51 degrees F) and the difference between mean summer and mean winter soil temperatures is less than 6 degrees C. The soils have an isomesic soil temperature regime.

Soil Moisture: The soil moisture control section is dry in some or all parts for 90 or more cumulative days in normal years and moist in some part for more than 180 cumulative days or for 90 or more consecutive days per year. The soils have an ustic soil moisture regime.

Depth to redoximorphic features: 50 to 100 centimeters

Base Saturation: less than 75 percent by sum of cations throughout the argillic horizon

Particle size control section (weighted average):
Clay content: 35 to 42 percent
Pararock fragments: 0 to 25 percent weakly cemented siltstone paragravel

A horizon:
Hue: 10YR or 2.5Y
Value: 4 through 6, 2 through 4 moist
Chroma: 1 through 4, dry and moist
Clay content: 18 to 26 percent
Pararock fragments: 0 to 14 percent weakly cemented siltstone paragravel

Reaction: moderately to slightly acid

Bt horizons:
Hue: 10 YR or 2.5Y
Value: 5 through 6, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Texture of the fine earth: silty clay loam or silty clay
Clay content: 33 to 50 percent
Pararock fragments: 0 to 34 percent weakly cemented siltstone paragravel
Reaction: strongly to moderately acid


Redoximorphic Features: fine and medium iron-manganese masses
Quantity: few to many
Hue: 7.5YR or 10YR
Value: 4 through 6, moist
Chroma: 4 through 8, moist

Redoximorphic features: fine and medium iron depletions
Quantity: none to common
Hue: 10YR to 5Y
Value: 4 or 5, moist
Chroma: 1 or 2, moist

C horizons:
Hue: 10 YR or 2.5Y
Value: 5 or 6, 4 or 5 moist
Chroma: 3 or 4, dry or moist
Texture of the fine earth: silty clay loam or silty clay
Clay content: 30 to 50 percent
Pararock fragments: 0 to 34 percent weakly cemented siltstone paragravel
Reaction: strongly to moderately acid

Redoximorphic Features: fine and medium iron-manganese masses
Quantity: few to many
Hue: 7.5YR or 10YR
Value: 4 through 6, moist
Chroma: 4 through 8, moist

Redoximorphic features: fine and medium iron depletions
Quantity: none to common
Hue: 10YR to 5Y
Value: 4 or 5, moist
Chroma: 1 or 2, moist

COMPETING SERIES: There are no other series in this family.

GEOGRAPHIC SETTING: Madturkey soils are on linear to concave or slightly convex positions of backslopes and footslopes on mountains. Slopes are 30 to 50 percent. Elevations are 60 to 400 meters. These soils formed in colluvium and residuum derived from weakly cemented siltstone. The climate is subhumid with warm, dry summers with a marine layer influence and cool, wet winters. Mean annual precipitation is 1250 to 1780 millimeters. The mean annual temperature is 10 to 12 degrees C. Frost free season is about 240 to 280 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Seelycreek (CA) and Gibsoncreek (CA) soils. Gibsoncreek and Seelycreek soils lack redoximorphic features within 150 centimeters of the surface. Gibsoncreek soils have between 18 and 26 percent clay in the particle size control section. Seelycreek soils contain between 27 and 34 percent clay in the particle size control section. Gibsoncreek and Seelycreek soils are found on linear to slightly concave or convex positions on summits, shoulders and backslopes.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Moderately well drained; very high runoff; moderately low saturated hydraulic conductivity. A seasonal water table is present between 50 and 100 centimeters in the months of December through April.

USE AND VEGETATION: This soil is used for timber production, wildlife habitat, and watershed. Natural vegetation includes Douglas-fir, tanoak, Pacific madrone, California laurel, California black oak, Oregon white oak, California huckleberry, and western swordfern. Coast redwood can occur in concave positions and, where present, is less than 50 percent.

DISTRIBUTION AND EXTENT: Coastal Redwood Belt; MLRA 4B. The series is not extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Humboldt County, South Part, California, 2010. The name is coined.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
1. Ochric epipedon: The zone from 0 to 14 centimeters (Oi and A horizons)
2. Argillic horizon: The zone from 42 to 150 centimeters (Bt1, Bt2, Bt3, and BCt horizons)
3. Particle-size control section: The zone from 42 to 92 centimeters (Bt1 and Bt2 horizons) averages 39 percent clay.
4. Aquultic subgroup feature and Aquic conditions: more than 10 percent fine prominent irregular gray (2.5Y 5/1) moist iron depletions in the matrix from 63 to 200 centimeters (Bt2, Bt3, BCt, and C horizons)

ADDITIONAL DATA: NSSL Pedon No. 08N0569

Keys to Soil Taxonomy, 12th edition

---

National Cooperative Soil Survey
U.S.A.