LOCATION NANNY CA

Established Series
Rev: SBJ/RCH/ET
03/2013

NANNY SERIES

The Nanny series consists of very deep, well drained soils formed in alluvium from basic igneous rock. Nanny soils are on fans. Slopes range from 0 to 9 percent. The mean annual precipitation is about 50 inches and the mean annual temperature is about 44 degrees F.

TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, frigid Typic Humixerepts

TYPICAL PEDON: Nanny gravelly loam is under a cover of Douglas fir, ponderosa pine, sugar pine, and white fir at an elevation of 4600 feet. (Colors are for dry soil unless otherwise stated. When described August, 1962, the soil was dry throughout).

A1--0 to 6 inches; dark grayish brown (10YR 4/2) gravelly loam, very dark grayish brown (10YR 3/2) moist; strong fine granular structure; soft, nonsticky, nonplastic; few very fine and fine roots; many very fine pores; 33 percent pebbles; slightly acid (pH 6.1); abrupt smooth boundary.

A2--6 to 12 inches; brown (10YR 4/3) gravelly loam, dark brown (10YR 3/3) moist; massive/weak fine granular structure; slightly hard, friable, nonsticky and nonplastic; few very fine and fine roots; many very fine and fine pores; 25 percent pebbles; slightly acid (pH 6.2); clear smooth boundary. (Combined thickness of the A horizon is 10 to 20 inches thick)

Bw--12 to 31 inches; brown (7.5YR 5/4) very gravelly heavy loam, dark brown (7.5YR 3/4) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; many very fine and fine pores; 36 percent gravel; moderately acid (pH 5.9); clear wavy boundary. (20 to 40 inches thick)

C--31 to 60 inches; light yellowish brown (10YR 6/4) very gravelly loam, dark yellowish brown (10YR 4/4) moist; massive, soft, friable, slightly sticky and plastic; few very fine roots; common very fine pores; 60 percent pebbles; moderately acid (pH 5.7).

TYPE LOCATION: Tehama County, California; about 1500 feet northwest of the junction of California Highways 32 and 36. Near the center of the southwest 1/4 of southeast 1/4 of section 10, T.28N., R.5E.

RANGE IN CHARACTERISTICS: Thickness of the solum is 30 to 60 inches. The mean annual soil temperature is 41 to 46 degrees F. The soil temperature exceeds 41 degrees F. from mid May to mid November and exceeds 47 degrees F. from early July to early October. The soil moisture control section (8 to 37 inches) is dry in all parts from mid August to mid October (60 to 80 days). The particle-size control section (10 to 40 inches) ranges from 10 to 18 percent clay and 35 to 60 percent rock fragments. Rock fragments, on the soil surface, range from 15 to 35 percent. Organic carbon ranges from 2 to 6 percent to a depth of 1 to 12 inches.

The A horizon color is 10YR and 7.5YR 3/2, 3/3, 4/2, 4/3, 5/2, 5/3. Moist color is 10YR and 7.5YR 2/2, 3/2, 3/3. Organic carbon ranges from 2 to 6 percent. Texture is gravelly, cobbly or stony sandy loam and loam. Clay content ranges from 6 to 18 percent. Rock fragments range from 15 to 35 percent. Reaction is slightly to strongly acid.

The Bw horizon color is 10YR and 7.5YR 5/2, 5/3, 5/4, 5/6, ts 6/2, 6/3, 6/4, 7/3, 7/4. Moist color is 10YR and 7.5YR 3/2, 3/3, 3/4, 4/2, 4/3, 4/4, 5/2, 5/3, 5/4. Organic carbon ranges from 0.4 to 0.9 percent. Texture is very gravelly loam or sandy loam. Clay content ranges from 10 to 18 percent. Rock fragments range from 35 to 60 percent. Reaction is very strongly to moderately acid.

COMPETING SERIES: These are the Freezeout (CA), Goodwin (OR), Snowbrier (OR) and Undusk WA) soils. Bindle, Freezeout and Snowbrier soils are 20 to 40 inches deep to bedrock. Goodwin soils have 15 to 25 percent clay in the particle-size control section and are dry for less than 60 days. Undusk soils have 18 to 25 percent clay and have a neutral reaction in the particle-size control section.

GEOGRAPHIC SETTING: Nanny soils are on fans. Slopes are 0 to 9 percent. These soils formed in alluvium weathered from volcanic rocks. Elevation is 4000 to 6000 feet. The climate is subhumid with warm dry summers and cold moist winters. Mean annual precipitation is 45 to 60 inches. Snowfall is 24 to 48 inches. The mean annual temperature is 49 degrees F. The mean January temperature is about 32 degrees F. The mean July temperature is about 63 degrees F. Frost-free season is 80 to 150 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Childs, Elam, Ponto and Wyntoon soils. Childs soils are fine loamy. Elam soils have an ochric epipedon and an irregular decrease in organic carbon. Ponto soils are medial. Wyntoon soils are fine loamy.

DRAINAGE AND PERMEABILITY: Well drained; slow runoff; moderately rapid permeability.

USE AND VEGETATION: This soil is used for timber production. The natural vegetation is Douglas fir, ponderosa pine, sugar pine, and white fir.

DISTRIBUTION AND EXTENT: Tehama and Shasta County, California. The soils are moderately extensive.

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

SERIES ESTABLISHED: Tehama County, Tehama Soil Survey Area, California 1962.

REMARKS: The classification was updated in February 2001 using the Eighth Edition to Soil Taxonomy, and in March of 2013 using the Eleventh Edition of Soil Taxonomy. This series was formerly classified as loamy-skeletal, mixed, frigid Typic Xerumbrepts. Competing series were not checked at these times.

Diagnostic horizons and features recognized in this pedon are:

Umbric epipedon - the zone from 0 to 16 inches (A1, A2)

Cambic horizon - the zone from 12 to 31 inches (Bw)

ADDITIONAL DATA: This pedon was characterized in 1960 and is described in the Tehama County Soil Survey Report, pages 111 and 117.

National Cooperative Soil Survey
U.S.A.