LOCATION HARBORD COEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, active, mesic Ustic Haplargids
TYPICAL PEDON: Harbord loam, cultivated. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 5 inches; grayish brown (10YR 5/2) loam, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure that parts to moderate fine granules; slightly hard, very friable; noncalcareous; moderately alkaline; clear smooth boundary. (4 to 6 inches thick)
Bt--5 to 15 inches; brown (10YR 5/3) light clay loam; brown (10YR 4/3) moist; moderate medium prismatic structure that parts to moderate medium subangular blocks; hard, very friable; many thin patchy clay films on horizontal and vertical faces of peds; noncalcareous; moderately alkaline; clear smooth boundary. (8 to 14 inches thick)
2Btkb--15 to 35 inches; brown (7.5YR 5/3) light clay loam; brown (7.5YR 4/3) moist; moderate medium prismatic structure that parts to moderate medium subangular blocks; very hard, friable; thin patchy clay films on peds; visible secondary calcium carbonate occurring as concretions and in thin seams and streaks coating peds; noncalcareous ped interiors, calcareous crushed soil mass; moderately alkaline; gradual smooth boundary. (14 to 24 inches thick)
2Bkb--35 to 40 inches; brown (7.5YR 5/4) light clay loam; brown (7.5YR 4/4) moist; moderate medium subangular blocky structure; very hard, friable; few thin patchy clay films on peds; visible secondary calcium carbonate occurring as concretions and in thin seams and streaks; moderately alkaline; gradual smooth boundary. (4 to 6 inches thick)
2Ckb--40 to 60 inches; light brown (7.5YR 6/3) loam; brown (7.5YR 5/3) moist; massive; hard, very friable; moderate visible secondary calcium carbonate occurring as concretions, in thin seams and streaks, and in finely divided forms; strongly alkaline. (Several feet thick)
TYPE LOCATION: Baca County, Colorado; 1,548 feet south and 110 feet west of the NE corner of Sec. 4, T. 29 S., R. 42 W.
RANGE IN CHARACTERISTICS:
Mean annual soil temperature: 53 degrees F.
Depth of the solum: 30 to 50 inches
Depth to argillic horizon: 4 to 6 inches
Depth to calcic horizon: 12 to 20 inches
Base saturated: 90 to 100 percent
Particle-size control section (weighted average):
Sand content: 20 to 40 percent
A horizon:
Hue: 2.5Y or 10YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 2 or 3
Texture: loam
Reaction: neutral or moderately alkaline
Bt horizon:
Hue: 2.5Y or 10YR
Value: 5 or 6 dry, 4 or 5 moist
Chroma: 2 to 4
Texture: light clay loam or heavy loam
Clay content: 18 to 35 percent
Silt content: 20 to 50 percent
Sand content: 15 to 35 percent
Reaction: neutral or moderately alkaline
Calcium carbonate equivalent: 6 to 12 percent in the lower part of the Bt2 horizon.
Note: The lower part is typically redder with hue of 10YR through 5YR, value 5 or 6 dry, 4 or 5 moist and chroma of 3 through 6.
C horizon:
Hue: 7.5YR or 5YR
Reaction: strongly alkaline.
Calcium carbonate equivalent: 8 to 15 percent.
COMPETING SERIES:
These are the
Balon,
Blancot,
Bowbac,
Buckle,
Cambria,
Cerrillos,
Cushman,
Decolney,
Doakum,
Forkwood,
Fort,
Gaddes,
Gapbutte,
Gapmesa,
Hagerman,
Los Alamos,
Marianolake,
Mentmore,
Oelop,
Olney,
Palacid, Pawspoc,
Penistaja,
Pokeman,
Potts,
Pugsley,
Quagwa,
Redpen,
Spangler,
Spenlo,
Sundance,
Teckla and
Yenlo series.
Balon, Decolney, and Spangler soils have no continuous horizons of secondary calcium carbonate accumulation.
Buckle, Doakum, Marionolake, Mentmore, Oelop, Palacid, Pawspoc, Quagwa, Redpen soils have dry soil moisture during
May and June.
Cerrillos, soils have calcic horizons. Potts, soil have solums less than 30 inches thick.
Bowbac, Cerrillos, Cushman, Gaddes, Gapbutte, Gapmesa, Hagerman and Pokeman, Pugsley and Spangler soils have a lithic or paralithic contact at depths of less than 40 inches.
Gapbutte, Gapmesa, Redpen, and Teckla soils have redder hues.
Blancot, Forkwood, Marianolake, and Mentmore soils have hues more yellow.
Cambria soils have Bt horizons less than 10 inches thick.
Los Alamos soils have pumice and ash at depths of 20 to 50 inches and have solum thickness of 12 to 34 inches.
Olney, and Penistaja soils have more than 35 percent fine and coarser sand in the B2t horizon.
Spenlo soils formed in mixed alluvium and have hue of 5YR or redder through the B2t horizon.
Olney, Penistaja, and Yenlo soils have 40 to 75 percent sand with more than 35 percent fine sands or coarser.
Sundance soils have lithologic discontinuities.
Teckla soils have fragmental discontinuity at 20 to 40 inches.
GEOGRAPHIC SETTING:
Parent Material: tertiary sediments of the Ogallala formation, capped by a thin increment of loess.
Landform: gently sloping to rolling uplands
Slope: 1 to 6 percent
Mean annual temperature: 53 degrees F.
Mean annual precipitation: 14 inches
Precipitation pattern: 11 inches of which falls during the months of April through August
GEOGRAPHICALLY ASSOCIATED SOILS:
These are the
Baca and
Wiley soils.
Baca soils have a fine montmorillonitic control section.
Wiley soils have a fine-silty control section.
DRAINAGE AND PERMEABILITY:
Drainage: well drained
Runoff: medium to low
Permeability: medium.
USE AND VEGETATION: These soils are used both as dry and irrigated cropland and as native pastureland. Native vegetation is mainly blue grama, sagebrush, and cactus.
DISTRIBUTION AND EXTENT: Southeastern Colorado. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Baca County, Colorado, 1975.
REMARKS: "Last updated by the state 1/75".
Diagnostic horizons and features recognized in this profile are:
Argillic horizon: 5 to 35 inches (Bt horizon)
Calcic horizon: 15 to 60 inches (2Btkb, 2Bkb, and 2Ckb horizon)
Updated the classification, competing series and placed in semitab format. LRM 03/01