LOCATION BARCO MOEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, active, thermic Humic Hapludults
TYPICAL PEDON: Barco loam - on a 3 percent convex north-facing slope in native prairie grasses at an elevation of 1010 feet. (Colors are for moist soil unless otherwise stated.)
A--0 to 11 inches; very dark brown (10YR 2/2) loam, grayish brown (10YR 5/2) dry; strong very fine and fine granular structure; very friable; many fine roots; many worm channels and casts; strongly acid; gradual smooth boundary. (6 to 18 inches thick)
BA--11 to 18 inches; dark brown (10YR 3/3) loam, brown (10YR 5/3) dry; weak very fine subangular blocky structure; friable; common fine roots; common very dark grayish brown coatings on surfaces of peds and worm casts; many root channels filled with material from A horizon; few sandstone fragments; very strongly acid; gradual smooth boundary. (0 to 8 inches thick)
Bt1--18 to 23 inches; dark yellowish brown (10YR 4/4) loam; common fine distinct yellowish red (5YR 4/6) mottles; weak very fine subangular blocky structure; friable; few fine roots; few faint clay films on faces of peds; common very dark grayish brown coatings on faces of peds and worm casts; few sandstone fragments; very strongly acid; gradual smooth boundary.
Bt2--23 to 30 inches; brown (7.5YR 5/4) sandy clay loam; few fine faint darker brown (7.5YR 4/4) and a few coarse prominent red (2.5YR 4/8) mottles; weak very fine and fine subangular blocky structure; friable; few fine roots; few faint clay films on faces of peds; common very dark grayish brown coatings on faces of peds and worm casts; few fine iron covered sandstone fragments; very strongly acid; gradual smooth boundary.
Bt3--30 to 34 inches; yellowish brown (10YR 5/4) sandy clay loam; many medium prominent red (2.5YR 4/8) and common medium faint brown (7.5YR 5/4) mottles; weak fine and medium subangular blocky structure; friable; few faint gray clay films on faces of peds; few dark concretions (oxides); common fine soft sandstone fragments; strongly acid; gradual wavy boundary. (Combined thickness of the Bt horizon is 10 to 24 inches.)
Cr--34 to 60 inches; red and light yellowish brown soft weakly stratified sandstone; thin discontinuous lenses of shale and gray and dark gray thick clay films or flows in the vertical cracks of the strata; very strongly acid.
TYPE LOCATION: Barton County, Missouri; just west of Lamar; 322 feet north and 1320 feet west of the southeast corner, sec. 26, T. 32 N., R. 31 W.; lat. 37 degrees 29 minutes 15 seconds N. and long. 94 degrees 18 minutes 43 seconds W..
RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is ; udic moisture regime
Depth to lithic contact: greater than to 40 inches
Depth to paralithic contact: 20 to 40 inches
Depth to argillic horizon: 6 to 26 inches
Depth to redox depletions: 30 to 34 inches
Particle-size control section (weighted average):
Clay content: 18 to 35 percent
A horizon:
Hue: 10YR or 7.5YR
Value: 2 or 3, 3 to 5 dry
Chroma: 1 to 3
Texture: loam, fine sandy loam, sandy loam, silt loam
Clay content: 12 to 15 percent
Base saturation: 50 to 80 percent
Reaction: strongly acid or moderately acid
Some pedons have an E horizon.
BA horizon:
Hue: 10YR or 7.5YR
Value: 2 to 4
Chroma: 2 to 3
Texture: loam, fine sandy loam, sandy loam, silt loam
Base saturation: 30 to 58 percent
Reaction: strongly acid or moderately acid
Bt horizon:
Hue: 5YR, 7.5YR, or 10YR
Value: 3 to 5, 4 to 6 dry
Chroma: 3 to 8
Texture: loam, sandy clay loam, or clay loam, or silt loam in the upper part
Clay content: 18 to 35 percent
Channer size fragments: 0 to 20 percent
Base saturation: 21 to 25 percent
Reaction: very strongly acid to slightly acid
Some pedons have a BC horizon.
C horizon (where present):
Mottled with colors:
Hue: 2.5YR to 10YR
Value: 4 to 7
Chroma: 1 to 8
Redoximorphic features: common masses of iron-manganese accumulation
Texture: fine sandy loam
Pararock fragments: 0 to 85 percent parachanners
Base saturation: 23 to 35 percent
Reaction: very strongly acid
COMPETING SERIES: There are no competing series within the same family.
GEOGRAPHIC SETTING:
Parent material: residuum derived from acid sandstone that contains thin beds of silty and sandy shales
Landscape: undulating to rolling uplands
Slopes: 1 to 35 percent
Mean annual temperature: 59 to 62 degrees F
Mean annual precipitation: 35 to 45 inches
GEOGRAPHICALLY ASSOCIATED SOILS:
Barden: fine family and moderately well drained
Collinsville: depth to hard sandstone bedrock ranges from 4 to 20 inches
Liberal: fine family and moderately well drained
Parsons: fine family and poorly drained
Sylvania: fine family and moderately well drained
DRAINAGE AND PERMEABILITY:
Drainage: well
Runoff: medium to high
Permeability: moderate
USE AND VEGETATION: About equally divided between grassland and cultivated crops. Principal crops are wheat, soybeans, sorghums, and corn. Native vegetation is prairie grasses, mainly big bluestem and little bluestem.
DISTRIBUTION AND EXTENT: Barco soils are extensive in southwestern Missouri (MLRA 112 and MLRA 116B).
MLRA OFFICE RESPONSIBLE: Salina, Kansas
SERIES ESTABLISHED: Barton County, Missouri, 1969.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: The zone from 18 to 34 inches. (Bt1, Bt2, and Bt3 horizons)
Umbric epipedon: The zone from 0 to 18 inches. (A and BA horizons)
Argillic horizon: The zone from 18 to 34 inches. (Bt1, Bt2, and Bt3 horizons)
Paralithic contact: The contact with sandstone is between 30 and 40 inches. (Cr horizons)
Lithic contact: The contact with sandstone is below 40 inches. (R horizons)
These soils are mostly in a wide belt adjacent to the Ozark border area. The northern boundary is north of the Fort Scott escarpment
These soils were formerly a part of the Bates series. They are excluded from that series due to low base saturation. They were originally classified as Alfisols, but lab data for the type location and from additional pedons from surrounding counties in Missouri shows that the correct classification is as an Ultisol.
The assignment of the cation-exchange activity class is supported by lab sample(s) numbers S90M0-011-006.
7/17/01 - PRF - added activity class and reformatted the RIC. added chroma 1 to the Bt horizon.
Taxonomic Version: Keys to Soil Taxonomy, Eighth Edition, 1998