LOCATION MANITA OREstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, mesic Mollic Haploxeralfs
TYPICAL PEDON: Manita loam, reforested. (Colors are for moist soil unless otherwise noted.)
A1--0 to 4 inches; dark brown (7.5YR 3/2) loam, brown (7.5YR 5/3) dry; moderate fine and very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine roots; many very fine tubular pores; slightly acid (pH 6.2); abrupt smooth boundary. (2 to 5 inches thick)
A2--4 to 8 inches; dark brown (7.5YR 3/3) loam, brown (7.5YR 5/3) dry; moderate medium and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and very fine roots; many fine tubular pores; slightly acid (pH 6.2); clear smooth boundary. (2 to 5 inches thick)
Bt1--8 to 13 inches; dark reddish brown (5YR 3/4) clay loam, brown (7.5YR 5/4) dry; moderate medium subangular blocky structure; hard, firm, sticky and plastic; common fine and very fine roots; many very fine tubular pores; few thin dark reddish brown (5YR 3/5) clay films; moderately acid (pH 6.0); clear smooth boundary. (3 to 6 inches thick)
Bt2--13 to 28 inches; yellowish red (5YR 3/6) heavy clay loam, yellowish red (5YR 4/6) dry; moderate fine and medium subangular blocky structure; very hard, firm, very sticky and very plastic; few fine and medium roots; many fine and very fine tubular pores; common thin and few moderately thick clay films; moderately acid (pH 6.0); clear wavy boundary. (11 to 17 inches thick)
Bt3--28 to 45 inches; yellowish red (5YR 3/6) heavy clay loam, yellowish red (5YR 4/6) dry; moderate fine subangular blocky structure; very hard, firm, very sticky and very plastic; few medium roots; many very fine tubular pores; common thin and moderately thick clay films; few black stains; moderately acid (pH 5.8); clear smooth boundary. (13 to 19 inches thick)
Bt4--45 to 58 inches; yellowish red (5YR 3/6) heavy clay loam, yellowish red (5YR 4/6) dry; weak medium subangular blocky structure; very hard, firm, very sticky and very plastic; common very fine tubular pores; common thin and few moderately thick clay films; 5 percent partially weathered gravel; few black concretions and common black stains; moderately acid (pH 5.7). (9 to 15 inches thick)
Cr--58 inches; partially weathered fractured siltstone.
TYPE LOCATION: Jackson County,Oregon; about 800 feet east of Griffin Creek Road and 200 feet south of Pioneer Road, and about 2,400 feet west and 2,000 feet south of the NE corner of sec. 11, T. 38 S., R. 2 W., Willamette Meridian.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 49 to 56 degrees F. The soils are usually moist but are dry during the summer for 80 to 110 consecutive days in all parts of the moisture control section and are moist in the winter. Depth to bedrock is 40 to 60 inches. It is moderately or slightly acid.
The A horizon has hue of 5YR, 7.5YR or 10YR, value of 3 or 4 moist, 4 through 6 dry and chroma of 2 through 4 moist and dry. It has 0 to 15 percent gravel. It has 2 to 4 percent organic matter.
The Bt horizon has hue of 2.5YR, 5YR or 7.5YR, value of 3 through 5 moist, 4 through 6 dry and chroma of 4 through 6 moist and dry. It is clay loam, silty clay or clay and has 35 to 45 percent clay and 0 to 15 percent gravel.
COMPETING SERIES: These are the Garfield and Secca series. Garfield soils crack in the Bt horizon during the summer, have manganese concretions and stainings and are neutral to moderately alkaline in the B horizon. Secca soils have mean annual soil temperature of 56 to 58 degrees F, are mildly alkaline in the lower part of the B horizon, and are dry for more than 120 consecutive days.
GEOGRAPHIC SETTING: Manita soils are on fans, hillslopes and mountain slopes and have gradients of 2 to 50 percent. The soils are at elevations of 800 to 4,000 feet. The soils formed in colluvium weathered from altered sedimentary and extrusive igneous rocks. The mean annual precipitation is 18 to 40 inches. The mean annual temperature is 47 to 54 degrees F. The frost-free period is 100 to 170 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Lettia, Ruch, Vannoy and Pollard soils. Lettia, Ruch and Vannoy soils are fine-loamy. Pollard soils have less than 35 percent base saturation in all parts of the argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; moderately slow permeability.
USE AND VEGETATION: Pasture, hay, homesites, timber production and water supply. The native vegetation is mainly Douglas fir, ponderosa pine, Pacific madrone, California black oak, Oregon white oak, mountainmahogany, California fescue and poison oak.
DISTRIBUTION AND EXTENT: Southwestern Oregon. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Josephine County, Oregon, 1979.
REMARKS: CEC activity class superactive added 1/2000, competing series not updated at that time.
ADDITIONAL DATA: Characterization data on one profile (S73-OR-15-2) from Oregon State University.