LOCATION LOHMILLER SD+MT NE WYEstablished Series
TAXONOMIC CLASS: Fine, smectitic, calcareous, mesic Torrertic Ustifluvents
TYPICAL PEDON: Lohmiller silty clay loam - on a plane slope of less than 1 percent in a cultivated field. When described the soil was moist throughout. (Colors are for dry soil unless otherwise stated.)
Ap--0 to 4 inches; grayish brown (2.5Y 5/2) silty clay loam, dark grayish brown (2.5Y 4/2) moist; moderate medium granular structure; hard, friable; many fine roots; neutral; clear smooth boundary.
A--4 to 8 inches; grayish brown (2.5Y 5/2) clay loam, dark grayish brown (2.5Y 4/2) moist; weak thin platy structure parting to weak fine granular; very hard, firm; common fine roots, neutral; clear smooth boundary. (Combined A horizons 4 to 10 inches thick)
C--8 to 60 inches; grayish brown (2.5Y 5/2) clay loam, stratified with layers of loam, fine sandy loam, and silty clay loam; dark grayish brown (2.5Y 4/2) moist; massive; very hard, firm; thin bedding planes evident; common very fine roots; strong effervescence; slightly alkaline.
TYPE LOCATION: Fall River County, South Dakota; about 5 miles northwest of Oelrichs; 550 feet east and 1,180 feet south of the northwest corner of sec. 21, T. 9 S., R. 7 E.
RANGE IN CHARACTERISTICS: Carbonates are within 10 inches of the surface. The control section averages from 35 to 50 percent clay.
The A horizon has hue of 10YR or 2.5Y, value of 5 or 6 and 4 or 5 moist, and chroma of 2 to 4. Some pedons have value of 4 dry and 3 moist in the upper 4 inches. It typically is silty clay loam or clay loam but is silty clay in some pedons. It ranges from neutral to moderately alkaline.
The C horizon has hue of 10YR, 2.5Y, or 5Y; value of 5 to 7 and 4 to 6 moist; and chroma of 2 to 4. It typically is clay loam or silty clay loam but is silty clay or clay in some pedons. It is stratified with thin layers of loamy sand, fine sandy loam, loam, sandy clay or silt loam. It is slightly alkaline or moderately alkaline. Some pedons have accumulations of carbonates.
COMPETING SERIES: There are no other series in this family.
GEOGRAPHIC SETTING: Lohmiller soils are on flood plains and high bottom lands of rivers and streams and on alluvial fans of foot slopes. Slopes are typically less than 2 percent but range from 0 to 8 percent. The soils formed in calcareous alluvium from sedimentary rock. Mean annual air temperature ranges from 45 to 48 degrees F, and mean annual precipitation ranges from 10 to 19 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Arvada, Haverson, Kyle, Norka, Pierre, Savo, and Stetter soils. Arvada soils have a natric horizon and are on similar landscapes. Haverson soils have a fine-loamy control section and are on similar landscapes. Kyle, Norka, Pierre, and Savo soils are on steeper and higher landscapes. Kyle and Pierre soils are very-fine textured and do not have stratification. Norka and Savo soils have argillic horizons. Stetter soils contain more clay and crack when dry and are on similar landscapes.
DRAINAGE AND PERMEABILITY: Well drained. Permeability is slow or moderately slow. Runoff is low on nearly level areas and medium on more sloping areas.
USE AND VEGETATION: Lohmiller soils are used for cropland and rangeland. Principal crops are winter wheat, alfalfa, and grain sorghum. Principal native vegetation is western wheatgrass, green needlegrass, blue grama, buffalograss, and sedges.
DISTRIBUTION AND EXTENT: Western South Dakota, northeastern Colorado, and eastern Wyoming. It is of large extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Denver, Colorado
SERIES ESTABLISHED: Treasure County, Montana, 1961.
REMARKS: Diagnostic horizons and features recognized in this pedon are: ochric epipedon - the zone from the surface to a depth of about 8 inches (Ap, A horizon).