LOCATION POLLARD OREstablished Series
TAXONOMIC CLASS: Fine, kaolinitic, mesic Typic Palexerults
TYPICAL PEDON: Pollard loam, forested. (Colors are for moist soil unless otherwise noted.)
Oi--2 inches to 0; partially decomposed litter of leaves, needles and twigs.
A1--0 to 3 inches; dark brown (7.5YR 3/3) loam, brown (7.5YR 4/4) dry; moderate fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and very fine roots; many irregular pores; 14 percent gravel; moderately acid (pH 5.6); abrupt smooth boundary. (2 to 5 inches thick)
A2--3 to 11 inches; dark brown (7.5YR 3/4) loam, brown (7.5YR 4/4) dry; moderate fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and very fine roots; many irregular pores; 14 percent gravel; moderately acid (pH 5.6); clear smooth boundary. (4 to 9 inches thick)
AB--11 to 18 inches; dark reddish brown (5YR 3/4) clay loam, reddish brown (5YR 4/4) dry; strong fine and medium subangular blocky structure; hard, firm, slightly sticky and slightly plastic; common fine and very fine and few medium roots; common tubular pores; 14 percent gravel; moderately acid (pH 5.6); clear smooth boundary. (3 to 8 inches thick)
Bt1--18 to 36 inches; dark reddish brown (5YR 3/4) clay loam, reddish brown (5YR 4/4) dry; strong medium and coarse subangular blocky structure; hard, very firm, sticky and plastic; few fine, very fine, and coarse roots; few tubular pores; common faint and many distinct clay films; 14 percent gravel; moderately acid (pH 5.6); gradual smooth boundary.
Bt2--36 to 45 inches; yellowish red (5YR 4/6) clay loam, reddish brown (5YR 5/4) dry; moderate medium and coarse subangular blocky structure; hard, very firm, sticky and plastic; few very fine and coarse roots; few tubular pores; common faint and many distinct clay films; 10 percent gravel and 5 percent cobbles; moderately acid (pH 5.6); gradual wavy boundary. (Combined thickness of the Bt horizon is 16 to 55 inches)
BCt--45 to 61 inches; brown (7.5YR 4/4) clay loam, brown (7.5YR 5/4) dry; weak medium and coarse subangular blocky structure; hard, firm, sticky and plastic; few medium and coarse roots; few tubular pores; many distinct clay films; 15 percent partially weathered gravel; strongly acid (pH 5.4).
TYPE LOCATION: Jackson County, Oregon; approximately 1,600 feet west and 500 feet north of the southeast corner of sec. 3, T. 34 S, R. 3 W.
RANGE IN CHARACTERISTICS: The soils are usually moist but are dry during the summer for 60 to 90 consecutive days in all parts of the moisture control section and are moist during the winter. The mean annual soil temperature is 47 to 56 degrees F. Solum thickness is 60 inches or more.
The A horizon has hue of 7.5YR, 5YR, or 2.5YR, value of 3 or 4 moist, 4 or 5 dry, chroma of 3 or 4 moist and 3 to 6 dry. It is loam or gravelly loam with 5 to 20 percent gravel and 0 to 10 percent cobbles.
The Bt horizon has hue of 2.5YR or 5YR, value of 3 or 4 moist, 4 or 5 dry in the upper part, and 5 dry in the lower part, and chroma of 4 to 6 moist and 5 to 7 dry. It is clay, silty clay, or clay loam and has 35 to 50 percent clay and 0 to 15 percent rock fragments in the Bt horizon and up to 50 percent in the BCt horizon or below the control section in some pedons. In some pedons there is 5 to 10 percent small black concretions.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: The Pollard soils are on hill slopes and toe slopes, foot slopes, saddles, ridges, and side slopes of mountains. Slopes are 2 to 60 percent. The soils are at elevations of 800 to 4,000 feet. The soils formed in alluvium and colluvium weathered from sedimentary, altered sedimentary and extrusive igneous rocks. The climate is characterized by warm moist to wet winters and hot dry summers. The mean annual precipitation is typically 30 to 60 inches but may range to 100 inches in the high winter rainfall interior mountains of Curry County, Oregon. The mean annual temperature is 45 to 54 degrees F. The frost-free period is 100 to 200 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Abegg, Josephine, Manita, Speaker and Vannoy soils. Abegg soils are loamy-skeletal. Josephine, Speaker and Vannoy soils are fine-loamy. Manita soils have higher base saturation.
DRAINAGE AND PERMEABILITY: Well drained; moderately slow permeability.
USE AND VEGETATION: Pollard soils are used for timber production, watershed, pasture, hay, wildlife habitat and homesites. The native overstory vegetation is Douglas fir, ponderosa pine, sugar pine, Oregon white oak, Oregon black oak, tanoak, Pacific madrone, cascade Oregongrape, common snowberry, and whipplevine.
DISTRIBUTION AND EXTENT: Southwestern Oregon; MLRA 5. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Josephine County, Oregon, 1979.
REMARKS: The classification was changed from Typic Haploxerults to Typic Palexerults in 1994, based in no decrease in clay by 20 percent or more to a depth of 60 inches.
Diagnostic horizons and features include:
Argillic horizon - the zone from 18 to 61 inches (Bt1, Bt2, and BCt horizons)
Pale feature - no clay decrease by 20 percent or more to a depth of 60 inches or more.
Particle-size control section - the zone from 18 to 38 inches (Bt1 and upper 2 inches of the Bt2 horizon)
ADDITIONAL DATA: Characterization data on two profiles (S69 Oreg. 15-7 and 15-8) reported on computer printout from the Riverside Soil Survey Laboratory on soils sampled in Josephine and Jackson Counties, Oregon. S69 Oreg. 15-7 is modal profile.