LOCATION LASA MNEstablished Series
TAXONOMIC CLASS: Sandy, mixed, mesic Entic Hapludolls
TYPICAL PEDON: Lasa loamy fine sand, on a south-facing, convex, 3 percent slope, on a ground moraine with a mantle of deltaic sediments, in a cultivated field. (Colors for moist conditions unless otherwise stated.)
Ap--0 to 10 inches; very dark gray (10YR 3/1) loamy fine sand, gray (10YR 5/1) dry; weak fine granular structure; very friable; neutral; abrupt smooth boundary.
A--10 to 15 inches; very dark grayish brown (10YR 3/2) loamy fine sand with common inclusions of very dark gray (10YR 3/1) loamy fine sand, grayish brown (10YR 5/2) dry; weak fine granular structure; very friable; neutral; clear smooth boundary. (Combined thickness of the A horizon is 10 to 20 inches.)
Bw1--15 to 23 inches; dark brown (10YR 3/3) loamy fine sand; weak medium granular structure; very friable; neutral; clear smooth boundary.
Bw2--23 to 36 inches; yellowish brown (10YR 5/4) loamy fine sand; weak medium granular structure; very friable; neutral; abrupt smooth boundary. (Combined thickness of the Bw horizon is 11 to 28 inches.)
BC--36 to 45 inches; dark yellowish brown (10YR 4/4) loamy fine sand; weak very fine and fine subangular blocky structure; friable; slightly acid; abrupt smooth boundary. (0 to 20 inches thick)
C--45 to 60 inches; light brownish gray (10YR 6/2) loamy fine sand; common thin strata of fine sand; single grain; neutral.
TYPE LOCATION: Blue Earth County, Minnesota; located about 1,515 feet west and 2,570 feet south of the northeast corner of section 21, T. 107 N., R. 28 W.; USGS Lake Crystal topographic quadrangle; lat. 44 degrees 03 minutes 30 seconds N. and long. 94 degrees 11 minutes 41 seconds W., NAD 83.
RANGE IN CHARACTERISTICS: The thickness of solum ranges from 30 to 70 inches. Depth to carbonates ranges from 60 to 80 inches. These soils do not have coarse fragments. The average texture between depths of 10 and 40 inches is fine sand or loamy fine sand. The content of medium sand is less than 5 percent and the content of very fine sand is commonly nearly as much as fine sand. The mollic epipedon is 10 to 20 inches thick.
The A horizon has hue of 10YR, value of 2 or 3, and chroma of 1 or 2. It is fine sand or loamy fine sand. Reaction is moderately acid to neutral.
Some pedons have a thin AB horizon.
The Bw horizon has hue of 7.5YR or 10YR, value of 3 to 5, and chroma are 3 to 5. Some pedons have redoximorphic features in the lower Bw horizons. It is loamy fine sand or fine sand with stratification. The reaction is slightly acid or neutral.
The C horizon has hue of 10YR or 2.5Y, value of 5 or 6, and chroma of 2 to 4. Some pedons have redoximorphic features in this horizon. It is stratified fine sand or loamy fine sand.
A 2C horizon of loamy, glacial till or lacustrine sediments commonly begins at depths ranging from 60 to 80 inches. A bedrock substratum phase is recognized.
COMPETING SERIES: These are the Bellechester, Finchford, Fruitfield, Hawick, Hononegah, Nesius, Sparta, Trempe, and Zumbro series. All these soils have more than 5 percent medium sand or coarser in the series control section.
GEOGRAPHIC SETTING: These soils have plane to convex slopes with gradients of 0 to 35 percent. They are on lake plains, outwash plains, valley trains, and terraces. The soils formed in loamy fine sand or fine sand sediments that are stratified. Loamy glacial till or silty or finer lacustrine sediments commonly begin at depths ranging from 60 to 80 inches. These sediments are from the Des Moines lobe of the Late Wisconsinan glaciation. Mean annual air temperature ranges from 45 to 48 degrees F. Mean annual precipitation ranges from 24 to 30 inches. Frost-free period ranges from 124 to 150 days. Elevation ranges from 700 to 1,570 feet above sea level.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Dassel, Fieldon, and Litchfield soils which formed in sediments similar to those of the Lasa soils and are members of the same hydrosequence. The Dassel soils are poorly and very poorly drained and are commonly in swales and depressions. The poorly drained Fieldon soils have carbonates throughout and are on lower lying terrain. The moderately well and somewhat poorly drained Litchfield soils are on lower lying or less sloping terrain.
DRAINAGE AND PERMEABILITY: Well drained. Surface runoff is slow or rapid. Permeability is moderately rapid.
USE AND VEGETATION: Most areas are cultivated. The principal crops are corn and soybeans. Native vegetation is tall grass prairie.
DISTRIBUTION AND EXTENT: Southern Minnesota. Inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Blue Earth County, Minnesota, 1975.
REMARKS: Diagnostic horizons recognized in this pedon include: mollic epipedon - from the soil surface to a depth of 15 inches (Ap and A horizons); udic moisture regime.
ADDITIONAL DATA: Refer to MAES Central File Code No. 1603 for results of some laboratory analysis of the typifying pedon.