LOCATION POE                     OR+CA

Established Series
Rev. JSC/AON/TDT/CEG/BTH
02/2024

POE SERIES

Landscape--Intermontane basin
Landform--terraces
Slope--0 to 2 percent
Parent material--alluvial-lacustrine sediments weathered from tuff, basalt, diatomite, and ash
Mean annual precipitation--about 305 mm
Mean annual air temperature--about 9 degrees C
Depth class--moderately deep
Drainage class--somewhat poorly
Soil moisture regime--xeric
Soil temperature regime--mesic
Soil moisture subclass--typic

TAXONOMIC CLASS: Sandy, mixed, mesic Vitrandic Durixerepts

TYPICAL PEDON: Poe ashy loamy fine sand, irrigated pasture

Ap1--0 to 8 cm; ashy loamy fine sand, gray (10YR 5/1) dry, very dark brown (10YR 2/2) moist; weak very fine granular structure; soft, very friable, nonsticky and nonplastic; common very fine roots; many very fine pores; strongly effervescent; moderately alkaline (pH 8.2); clear smooth boundary

Ap2--8 to 23 cm; ashy loamy sand, gray (10YR 5/1) dry, very dark brown (10YR 2/2) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine roots; few medium and common very fine tubular pores; strongly effervescent; moderately alkaline (pH 8.3); gradual smooth boundary

AC--23 to 41 cm; ashy loamy sand, gray (10YR 5/1) dry, very dark grayish brown (10YR 3/2) moist; massive; soft, very friable, nonsticky and nonplastic; common very fine roots; few very fine tubular pores; strongly effervescent; moderately alkaline (pH 8.3); gradual smooth boundary

C1--41 to 56 cm; ashy loamy sand, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; massive; soft, very friable, nonsticky and nonplastic; few very fine roots; few very fine tubular pores; weakly effervescent; moderately alkaline (pH 8.0); gradual smooth boundary

C2--56 to 76 cm; ashy loamy sand, light brownish gray (10YR 6/2) dry, dark grayish brown (10YR 4/2) moist; massive; soft, very friable, nonsticky and nonplastic; few very fine roots; common very fine tubular pores; slightly alkaline (pH 7.8); abrupt wavy boundary

2Cqm1--76 to 91 cm; cemented material, very dark brown (10YR 2/2) and very dark grayish brown (10YR 3/2) moist; platy structure; extremely firm, indurated; few very fine roots in vertical fractures; vertical fractures coated with brown (10YR 4/3) opal; gray (10YR 6/1) indurated laminar cap at top of duripan; moderately alkaline (pH 8.2); abrupt smooth boundary

2Cqm2--91 to 117 cm; cemented material, very dark brown (10YR 2/2) and very dark grayish brown (10YR 3/2) moist; platy structure; extremely firm, indurated; few very fine roots in vertical fractures; vertical fractures coated with opal; gray (10YR 6/1) indurated laminar cap at top of duripan; moderately alkaline (pH 8.2)

TYPE LOCATION: Klamath County, Oregon; about 6.4 km east and 4.8 km south of the town Klamath Falls; 820 m east and 410 m south of the northwest corner of section 29, T. 39 S., R. 10 E., Willamette Meridian; Altamont, Oregon USGS 7.5 Minute Topographic Quadrangle; latitude 42.15222 degrees north, longitude 121.6672 degrees west, datum WGS 84 (coordinates derived from topographic map legal description)

RANGE IN CHARACTERISTICS:
Soil temperature regime--mesic
Mean annual soil temperature-- 8 to 11 degrees C
Moisture control section--30 to 76 cm; seasonally high water table (episaturation), perched above the duripan, can saturate lower portions of the control section between October and July
Organic carbon--less than 0.6 percent throughout the soil
Depth to duripan--50 to 100 cm

Particle-size control section:
*Clay content--7 to 10 percent
*Rock fragment content--0 to 6 percent volcanic gravel
*Durinode content--0 to 14 percent

In some pedons, the duripan is underlain by loamy sand, loamy fine sand, and coarse sand to a depth of more than 150 cm.

Estimated properties, all horizons
*Ammonium oxalate extractable Al plus 1/2 Fe--0.2 to 0.4 percent
*1500 kPa water (air-dried samples)--10 to 15 percent
*Volcanic glass--5 to 20 percent
*1/3-bar bulk density--1.0 to 1.35 g/cm3

A or Ap horizons
Hue--10YR or 2.5Y, dry or moist
Value--4 to 6 dry, 2 to 4 moist
Chroma--1 to 3 dry or moist
Fine-earth texture--ashy loamy fine sand, ashy loamy sand, ashy fine sandy loam
Clay content--5 to 15 percent
Gravel content--0 to 5 percent; 2 to 5 mm diameter
Reaction--moderately to very strongly alkaline
Thickness--5 to 45 cm

AC horizon
Hue--10YR or 2.5Y, dry or moist
Value--4 to 6 dry, 2 to 4 moist
Chroma--1 to 3 dry or moist
Fine-earth texture--ashy loamy sand, ashy loamy fine sand, ashy fine sandy loam
Clay content--7 to 10 percent
Gravel content--0 to 5 percent; 2 to 5 mm diameter
Reaction--moderately to very strongly alkaline
Thickness--10 to 30 cm

C horizons
Hue--10YR or 2.5Y, dry or moist
Value--5 to 7 dry, 3 to 5 moist
Fine-earth texture--ashy loamy fine sand, ashy loamy sand
Clay content--7 to 10 percent; less than 2.5 times 15 bar water
Gravel content--0 to 5 percent; 2 to 5 mm diameter
Durinode content--0 to 14 percent
Reaction--moderately to very strongly alkaline
Thickness--15 to 60 cm

2Cqm horizons (duripan)
Opal cap--1 to 2 mm thick; indurated
Opal coatings in vertical fractures
Thickness--10 to over 75 cm

COMPETING SERIES:
There are no series in this family at this time.

GEOGRAPHIC SETTING:
Elevation--1230 to 1310 m
Climate--semiarid with warm, dry summers and cold, moist winters
Mean annual air temperature-- 7 to 11 degrees C
Mean annual precipitation--254 to 455 mm
Mean January temperature-- about -2 degrees C
Mean July temperature-- about 19 degrees C
Frost-free period--50 to 110 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Fordney--mollic epipedon; no duripan; noncalcareous
Henley--fine-loamy
Laki--mollic epipedon; no duripan; fine-loamy

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat poorly drained
Saturated hydraulic conductivity (Ksat)--high to very high in Ap, AC, and C horizons; low in 2Cqm horizons (duripan)
Saturation in normal years--episaturation (above the duripan) and endosaturation (below the duripan); water table is highest in January through May

USE AND VEGETATION:
Use--irrigated agriculture, dwellings
Vegetation--Baltic rush, inland saltgrass, meadow barley

DISTRIBUTION AND EXTENT: Klamath and Shasta Valleys and Basins, OR; MLRA 21; moderately extensive

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED:
Klamath County, Oregon, 1977

REMARKS:
Diagnostic horizons and features in this pedon
*Ochric epipedon
*Volcanic glass--all horizons
*Aquic conditions--C2 horizon
*Episaturation--C2 horizon
*Redoximorphic concentrations--C2 horizon
*Redoximorphic depletions with chroma 2 or less--C2 horizon
*Duripan--Cqm horizons

ADDITIONAL DATA:
NASIS SITE ID--S1967OR035007; NASIS PEDON ID--S1967OR035007

Characterization data on 2 profiles (S67 Oreg. 18-7 and 18-8) reported in Riverside Soil Survey Laboratory report for Poe soils sampled in Klamath County, Oregon, 1967. Profile 18-7 is the type location.

05/2022: Updated horizonation, ashy textural modifiers, diagnostic features, and classification; vitrandic subgroup criteria based on andic soil property laboratory data from nearby Laki soil (pedon ID S2015OR035011); added information on material below the duripan, based on information in published soil survey manuscript for Klamath County, Oregon, Southern Part (OR640).

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National Cooperative Soil Survey
U.S.A.