LOCATION PINNOBIE CAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, thermic Ultic Haploxerolls
TYPICAL PEDON: Pinnobie loam - on an east-facing slope of 2 percent in a vineyard at 675 feet elevation. (Colors are for dry soil unless otherwise stated. When described October 20, 1980, the soil was moist throughout due to recent irrigation.)
Ap--0 to 11 inches; brown (10YR 5/3) loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine and few coarse roots; common very fine and fine and few medium interstitial and tubular pores; 5 percent 2 to 25 mm pebbles; slightly acid (pH 6.5); clear wavy boundary. (10 to 13 inches thick)
Bw1--11 to 26 inches; light yellowish brown (10YR 6/4) loam, dark yellowish brown (10YR 4/6) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine, fine and medium roots; many very fine and common fine tubular pores; few granular gray coatings on ped faces; 5 percent 2 to 25 mm rounded pebbles; worm casts in the upper 5 inches; slightly acid (pH 6.5); gradual wavy boundary. (12 to 23 inches thick)
Bw2--26 to 42 inches; light yellowish brown (10YR 6/4) loam, dark yellowish brown (10YR 4/6) moist; weak medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; common very fine and fine tubular pores; neutral (pH 6.8); clear wavy boundary. (13 to 24 inches thick)
C1--42 to 48 inches; variegated light yellowish brown (10YR 6/4) and yellowish brown (10YR 5/6) loam, dark yellowish brown (10YR 4/6) and grayish brown (10YR 5/2) moist; weak medium subangular blocky structure; hard, friable, slightly sticky and plastic; few very fine and fine roots; few very fine and fine tubular pores; few thin clay films and few granular gray coatings on ped faces; slightly acid (pH 6.5); gradual wavy boundary. (3 to 9 inches thick)
C2--48 to 60 inches; variegated light yellowish brown (10YR 6/4) and yellowish brown (10YR 5/8) clay loam, dark yellowish brown (10YR 4/6) and grayish brown (10YR 5/2) moist; massive; hard, firm, slightly sticky and plastic; few fine roots; few very fine, fine and medium tubular pores; neutral (pH 7.0).
TYPE LOCATION: Mendocino County, California; 120 feet north of the northeast corner of the Parducci Winery tasting room, and 70 feet east of the eastern edge of the road adjacent to the bottling building. The tasting room is located on Parducci Road, 0.4 mile west of State Street, Ukiah, California; 2,550 feet south and 3,700 feet east of the northeast corner of sec. 31, T. 16 N., R. 12 W., MDBM, Ukiah Quadrangle.
RANGE IN CHARACTERISTICS: Depth to bedrock is greater than 60 inches. The solum is 40 to 60 inches thick. Where not irrigated, the soil, between a depth of 5 to 18 inches, is dry in all parts from June to October and is moist in all parts from December through May. The mean annual soil temperature varies from 59 to 61 degrees F. Mean January soil temperature is 47 degrees F and mean July temperature is 76 degrees F. Organic matter content to a depth of 10 inches is 1 to 2 percent. Base saturation is 50 to 75 percent in the upper 30 inches and is greater than 50 below 30 inches.
The A horizon is 10YR 5/3 or 7.5YR 5/3. Moist colors are 10YR 3/3 or 7.5YR 3/3. It is loam with 18 to 27 percent clay and 5 to 10 percent gravel. It is slightly acid or neutral.
The Bw horizon is 10YR 5/4, 6/4 or 7.5YR 6/4. Moist colors are 10YR 3/4, 4/4, 4/6 or 7.5YR 4/4 or 4/6. It is loam or sandy clay loam or their gravelly equivalents with 18 to 30 percent clay and 0 to 20 percent gravel. It is slightly acid or neutral.
The C horizon has variegated colors of 10YR 4/6, 6/4, 5/8, 5/6, 5/4 and 5/3 with moist colors of 10YR 4/6, 5/2, 4/4 and 7.5YR 3/3. It is loam, clay loam, sandy clay loam, or their gravelly equivalents with 18 to 30 percent clay and 0 to 25 percent gravel.
COMPETING SERIES: There are no other series in this family. Some soils in other families are Hoover (T), Pinole, and Tocaloma series. Hoover soils have a mesic soil temperature and a paralithic contact within 60 inches. Pinole soils have an argillic horizon. Tocaloma soils have mesic soil temperatures and are 20 to 40 inches deep to a lithic contact.
GEOGRAPHIC SETTING: The Pinnobie soils are on terraces and have slopes of 0 to 15 percent. The soils have formed in alluvium from sedimentary rocks. Elevations are 500 to 1,500 feet. The climate is subhumid with hot, dry summers and cool, moist winters. Mean annual precipitation is 32 to 44 inches and occurs during November through April as rain. Mean January temperature is about 46 degrees F; mean July temperature is about 72 degrees F; mean annual temperature is 57 degrees to 59 degrees F. The frost-free season is 200 to 250 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Pinole, Redvine (T), and Yokayo (T) soils in other families. Pinole, Redvine and Yokayo soils have an argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained; slow or medium runoff; moderate permeability.
USE AND VEGETATION: Used for wine grape and pear production. Natural vegetation was annual grasses, manzanita, poison-oak, black oak and toyon. Most areas of this soil are cleared and cultivated.
DISTRIBUTION AND EXTENT: Northern California in the Coast Range. These soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Mendocino County, Eastern Part, California 1984. The name is coined.
REMARKS: Change in type location. Sample 78CA145-27(1-5) had base saturations by sum too low for Mollisolls. Most of this soil as mapped has B.S. of more than 50 percent.
The activity class was added to the classification in February of 2003. Competing series were not checked at that time. - ET