LOCATION PULTNEY CO+MTEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Ustic Haplocambids
TYPICAL PEDON: Pultney loam - grassland. (Colors are for dry soil unless otherwise noted.)
A--0 to 10 centimeters (0 to 4 inches); light brownish gray (10YR 6/2) loam, dark grayish brown (10YR 4/2) moist; weak fine subangular blocky structure that parts to moderate fine granular; soft, very friable; calcareous moderately alkaline (pH 8.0); clear smooth boundary. (8 to 15 centimeters (3 to 6 inches) thick)
AC--10 to 23 centimeters (4 to 9 inches); light yellowish brown (2.5Y 6/3) heavy loam, olive brown (2.5Y 4/3) moist; weak medium prismatic structure that parts to weak medium subangular blocky; slightly hard, very friable; calcareous; moderately alkaline (pH 8.2); gradual smooth boundary. (8 to 15 centimeters (3 to 6 inches) thick)
Ckz--23 to 61 centimeters (9 to 24 inches); light yellowish brown (2.5Y 6/3) light clay loam, light olive brown (2.5Y 5/3) moist; massive; hard, friable; visible calcium carbonate, calcium sulfate, and probably other salts occurring in fine crystals, as concretions, and in finely divided forms; calcium carbonate equivalent approximately 20 percent; calcareous; moderately alkaline (pH 8.4); clear smooth boundary. (15 to 86 centimeters (6 to 34 inches) thick)
Cr--61 to 152 centimeters (24 to 60 inches); partially weathered calcareous gypsiferous shales. Variegated colors ranging from pale yellow (2.5Y 8/3) to light yellowish brown (2.5Y 6/3).
TYPE LOCATION: Prowers County, Colorado; 0.6 kilometers (0.4 mile) south and 16 meters (51 feet) east of the NW corner of Sec. 18, T. 25 S., R. 47 W.
RANGE IN CHARACTERISTICS:
Soil moisture control section: moist in some part for about 65 to 130 days
Depth to a paralithic contact: 51 to 102 centimeters (20 to 40 inches)
Depth to calcic horizon: 15 to 30 centimeters (6 to 12 inches)
Cation exchange capacity (meq/100gm): 6 to 15
Particle-size control section (weighted average):
Clay content: 13 to 35 percent
Sand content: 15 to 55 percent
Silt content: 20 to 55 percent
Rock fragments: 0 to 5 percent
Size: gravel
A horizon:
Hue: 2.5Y or 10YR
Value: 5 to 7, 3 to 5 moist,
Chroma: 1 to 3.
Organic carbon of the upper 38 centimeters (15 inches): .8 to 2 percent
Texture: loam and clay loam
Clay content: 13 to 35 percent
Exchangeable sodium: 1 to 4 percent within the upper 10 inches of the surface
Reaction: moderately alkaline
Some pedons may have an AC horizon.
C horizon:
Hue: 5Y of 10YR
Value: 6 to 8, 4 to 6 moist
Chroma: 2 to 6
Texture: clay loam and silty clay loam
Clay content: 20 to 35 percent
Calcium carbonate equivalent: approximately 20 percent
Exchangeable sodium: 10 to 15 percent
Reaction: Moderately alkaline
Note: Discontinuous layers of gypsum crystals are present in some pedons.
COMPETING SERIES: Current Competing series are the
Aquima,
Atrac,
Bullpen,
La Fonda,
Querencia,
Shavano and
Zigweid soils
The Aquima, Atrac, La Fonda, Querencia and Zigweid soils do not have a paralithic contact.
The hues of Bullpen soils are not as yellow.
Lithic contact: 51 to 102 centimeters (20 to 40 inches) to sandstone bedrock
GEOGRAPHIC SETTING:
Parent material: weathered residually from the underlying highly gypsiferous shale
Landform: upland hills and ridges
Slope: 2 to 12 percent
Mean annual temperature: 11 to 15 degrees C. (52 to 59 degrees F.)
Mean annual precipitation: 36 centimeters (14 inches)
Precipitation pattern: 20 to 23 centimeters (8 to 9 inches) of which falls during the months of April through August.
Frost-free period: 160 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Kim,
Midway,
Ordway,
Renohill and
Shingle soils.
Kim soils lack a paralithic contact within a depth of 40 inches.
Midway and Shingle soils have a paralithic contact within a depth of 20 inches.
Ordway soils have more than 25 percent clay in the series control section.
Renohill soils have argillic horizons.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage: well drained
Runoff: medium
Saturated Hydraulic Conductivity: moderately high
USE AND VEGETATION: This soil is primarily used for rangeland and wheat production.
Alkali sacaton, blue grama and galleta dominate the rangeland.
DISTRIBUTION AND EXTENT: Southeastern Colorado and southeastern Montana. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Prowers County, Colorado, 1963.
REMARKS: Diagnostic horizons and features recognized in this profile are:
Paralithic contact: 61 centimeters (24 inches) (Cr horizon)
Calcic horizon: 23 to 61 centimeters (9 to 24 inches) (Ckz horizon)
OSED scanned by NSSQA and cleaned by Colorado. OSD last revised by state on 9/77.
Updated the classification, competing series and placed in semi-tab format. LRM 03/01
Modified format by LRM in 6/2006 to include metric conversion and change permeability to saturated hydraulic conductivity.