LOCATION POXMASH KSEstablished Series
The Poxmash soils consists of deep, well drained, moderately rapidly permeable soils that formed in alluvium over residuum derived from permian shale. Poxmash soils are on strath terraces in River Valleys of the Great Bend Sand Plains (MLRA 79). Slopes range from 0 to 6 percent. Mean annual precipitation is about 29 inches (74 centimeters) and the mean annual temperature is about 58 degrees F (14 degrees C).
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, mesic Udic Haplustalfs
TYPICAL PEDON: Poxmash sandy loam on a northwest facing, planar, 1 percent slope in cropland at an elevation of 1500 feet. (Colors are for dry soil unless otherwise noted.) When described on 12/10/96 the soil was moist from 0 to 80 inches.
Ap--0 to 5 inches (0 to 13 centimeters); brown (10YR 5/3), interior, sandy loam, brown (10YR 4/3), interior, moist; weak fine subangular blocky structure; soft, friable, nonsticky and nonplastic; common very fine roots throughout; 13.0 percent clay; noneffervescent throughout (HCl, 1 normal); moderately acid; abrupt smooth boundary.
A--5 to 9 inches (13 to 23 centimeters); brown (10YR 4/3), interior, sandy loam, dark brown (10YR 3/3), interior, moist; weak fine and medium subangular blocky structure; soft, friable, nonsticky and nonplastic; common very fine and fine roots throughout; 14.0 percent clay; noneffervescent throughout (HCl, 1 normal); 1 percent subrounded mixed gravel; moderately acid; clear smooth boundary. (5 to 9 inches thick; 13 to 23 centimeters thick)
Bt1--9 to 15 inches (23 to 38 centimeters); yellowish brown (10YR 5/4), interior, sandy loam, dark yellowish brown (10YR 4/4), interior, moist; weak fine and medium subangular blocky structure; soft, friable, slightly sticky and slightly plastic; common very fine roots throughout; 17.0 percent clay; very few faint patchy dark yellowish brown (10YR 4/4) clay films on vertical faces of peds; noneffervescent throughout (HCl, 1 normal); 1 percent subrounded mixed gravel; slightly acid; gradual wavy boundary. (7 to 20 inches thick; 18 to 50 centimeters thick)
Bt2--15 to 20 inches (38 to 51 centimeters); light yellowish brown (10YR 6/4), interior, sandy loam, yellowish brown (10YR 5/4), interior, moist; weak fine and medium subangular blocky structure; soft, friable, nonsticky and nonplastic; common very fine roots throughout; 10.0 percent clay; few faint patchy clay bridging between sand grains; noneffervescent throughout (HCl, 1 normal); 1 percent subrounded mixed gravel; slightly acid; gradual smooth boundary. (7 to 20 inches thick; 18 to 50 centimeters)
C1--20 to 32 inches (51 to 83 centimeters); very pale brown (10YR 7/4), interior, loamy sand, light yellowish brown (10YR 6/4), interior, moist; single grain; loose, loose, nonsticky and nonplastic; 5.0 percent clay; noneffervescent throughout (HCl, 1 normal); 1 percent subrounded mixed gravel; moderately acid; gradual wavy boundary. (0 to 27 inches thick; 0 to 69 centimeters thick)
C2--32 to 48 inches (81 to 122 centimeters); very pale brown (10YR 8/3), interior, sand, very pale brown (10YR 7/3), interior, moist; single grain; loose, loose, nonsticky and nonplastic; 1.0 percent clay; noneffervescent throughout (HCl, 1 normal); moderately acid; abrupt smooth boundary. (0 to 27 inches; 0 to 69 centimeters thick)
Cr--48 to 80 inches (122 to 203 centimeters); weathered permian shale bedrock; noneffervescent throughout (HCl, 1 normal).
TYPE LOCATION: Reno County, KS; about 3 miles (4.8 kilometers) west of Castelton; located about 240 feet (73 meters) South and 700 feet (213 meters) West of the Northeast corner of sec. 24, T. 25 N., R. 7 W.; Pretty Prairie USGS quad; lat. 37 degrees 52 minutes 2.0 seconds N. and long. 98 degrees 2 minutes 0.8 seconds W.
RANGE IN CHARACTERISTICS:
Soil moisture regime: ustic moisture regime bordering on udic
Soil temperature regime: mesic
Mean annual soil temperature: 56 to 58 degrees F (13 to 14 degrees C).
Surface rock fragments: 0 - 2 percent
Particle-size control section: 10 to 17 percent clay
Depth to non-paralithic contact: 40 to 59 inches (102 to 150 centimeters)
Thickness of the ochric epipedon: 5 to 9 inches (13 to 22 centimeters)
Thickness of the argillic horizon: 7 to 20 inches (18 to 50 centimeters)
A horizon:
Hue: 10YR or 7.5YR
Value: 5 to 3 (moist) 6 to 4 (dry)
Chroma: 3 to 4
Texture: sandy loam
Rock fragments: 0 - 2 percent
Reaction: moderately acid to slightly acid
Bt horizon:
Hue: 10YR or 7.5YR
Value: 4 to 6 (moist) 5 or 7 (dry)
Chroma: 4
Texture: sandy loam or fine sandy loam
Rock fragments: 0 - 10 percent
Reaction: moderately acid to slightly acid
Some pedons have a BC horizon
BC horizon:
Hue: 10YR or 7.5YR
Value: 6 to 7 (moist) 7 to 8 (dry)
Chroma: 3 to 4
Texture: sandy loam, loamy sand, or sand
Rock fragments: 0 - 10 percent
Reaction: slightly acid to slightly alkaline
C horizon:
Hue: 10YR or 7.5YR
Value: 6 to 8 (moist and dry)
Chroma: 3 to 4
Texture: loamy sand or sand
Rock fragments: 0 - 10 percent
Reaction: moderately acid to moderately alkaline
Cr horizon:
Hue: 5G or 2.5YR
Value: 3 to 6
Chroma: 2 to 4
Texture: weathered Beds - permian shale or siltstone
COMPETING SERIES: These are the Attica (KS), and Hayes (KS) series. The Hayes and Attica series are both very deep and occur on dunes on Paleo-terraces. The Hayes series has a buried soil at greater than 30 inches (76 centimeters).
GEOGRAPHIC SETTING: Poxmash soils
Parent material: Alluvium over residuum derived from shale
Landform: Strath terraces in River Valleys
Slopes: 0 to 6 percent
Elevation: 1400 to 1600 feet (426.7 to 487.7 meters)
Mean annual air temperature: 56 to 58 degrees F (13 to 14 degrees C).
Mean annual precipitation: 27 to 29 inches (69 to 74 centimeters)
Wettest months: Mar. to Oct.
Driest months: Nov to Feb.
Frost-free period: 180 to 200 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Piedmont, Jamash, Saxman, and Shellabarger series. The very deep Saxman soils occur on high flood plains and have seasonal high water table. Shellabarger soils occur at higher elevations on paleo-terraces and are very deep also. Jamash and Piedmont soils are pediments that are fine textured. Jamash soils are shallow.
DRAINAGE AND PERMEABILITY:
Drainage: Well drained,
Runoff: low to moderately high
Permeability: moderately rapid in the upper part and very slow in the lower part of the horizon .
USE AND VEGETATION: Cropland and native rangeland are the primary land uses. Small grains and sorghum are the primary crops.
DISTRIBUTION AND EXTENT: South Central Kansas. LRR H Great Plains Winter Wheat and Range, MLRA 79 Great Bend Sand Plains. This series is of minor extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Reno County, KS. 1996
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: The zone from 0 to 9 inches (0 to 23 centimeters) (Ap, A)
Argillic horizon: The zone from 9 to 20 inches (23 to 50 centimeters) (Bt1, Bt2)
Keys to Soil Taxonomy: Eighth edition, 1998
ADDITIONAL DATA: Typical pedon site ID 96KS155443
POXMASH SERIES
LRR=H
DATE: 04/03/97
Series is set up in the transitional zone between MLRAs 79 and 80A. The central concept is the Arkansas River Valley Alluvium that overlies the Permian bedrock.
This is of very small extent.
6/3/97 PRF: made corrections based on comments from other states. Corrected the landform to a pediment instead of a terrace
12/23/99 PRF: established series by Reno County final correlation.