LOCATION LAKEPORT IA+SDEstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Aquertic Hapludolls
TYPICAL PEDON: Lakeport silty clay loam, on a nearly level flood plain, in a cultivated field, at an elevation of 1,070 feet above sea level. (Colors are for moist soil unless otherwise stated.)
Ap1--0 to 4 inches; very dark brown (10YR 2/2) silty clay loam, very dark grayish brown (10YR 3/2) dry; weak fine subangular blocky structure parting to moderate very fine granular and moderate very fine subangular blocky; friable; few fine roots; few fine tubular pores; strongly acid; abrupt smooth boundary.
Ap2--4 to 12 inches; black (10YR 2/1) silty clay loam, very dark gray (10YR 3/1) dry; moderate very fine subangular blocky structure; friable; few fine roots; common fine tubular pores; moderately acid; clear smooth boundary.
A--12 to 22 inches; black (10YR 2/1) silty clay loam, very dark gray (10YR 3/1) dry; moderate fine subangular blocky structure parting to moderate very fine subangular blocky and moderate very fine granular; friable; few fine roots; common fine tubular pores; slightly acid; clear smooth boundary. (Combined thickness of the A horizons is 10 to 24 inches.)
Bg1--22 to 28 inches; dark grayish brown (10YR 4/2) silty clay loam; moderate fine granular and moderate very fine subangular blocky structure; firm; few fine roots; few medium tubular pores; common distinct very dark grayish brown (2.5Y 3/2) organic coats on vertical faces of peds; neutral; clear smooth boundary.
Bg2--28 to 37 inches; dark grayish brown (2.5Y 4/2) silty clay loam; moderate very fine subangular blocky structure; firm; few distinct very dark grayish brown (2.5Y 3/2) organic coats on vertical faces of peds; neutral; clear smooth boundary.
Bg3--37 to 48 inches; dark grayish brown (2.5Y 4/2) silty clay; moderate very fine subangular blocky structure; firm; few distinct olive gray (5Y 5/2) coats on vertical faces of peds; few fine prominent dark yellowish brown (10YR 4/4) and many fine prominent light yellowish brown (10YR 6/4) redoximorphic concentrations; neutral; abrupt smooth boundary. (Combined thickness of the Bg horizons is 16 to 30 inches.)
2Cg1--48 to 58 inches; grayish brown (2.5Y 5/2) silt loam; massive; very friable; few distinct dark grayish brown (2.5Y 4/2) coats in root channels and pores; few fine prominent dark yellowish brown (10YR 4/4), many medium prominent brown (7.5YR 4/4), and common fine prominent yellowish brown (10YR 5/4) redoximorphic concentrations; strongly effervescent; moderately alkaline; clear smooth boundary.
2Cg2--58 to 64 inches; grayish brown (2.5Y 5/2) silty clay loam; massive; friable; few very fine roots; many fine tubular pores; common fine light brownish gray (2.5Y 6/2) carbonate threads; many fine prominent yellowish brown (10YR 5/6), and common fine distinct brown (10YR 4/3) redoximorphic concentrations; strongly effervescent; moderately alkaline; abrupt smooth boundary.
3Cg3--64 to 76 inches; grayish brown (2.5Y 5/2) silty clay; massive; very firm, few very fine roots; common very fine tubular pores; few dark yellowish brown (10YR 4/6) coats in root channels and pores; few fine and medium light brownish gray (2.5Y 6/2) carbonate nodules; many fine prominent yellowish brown (10YR 5/4) and common fine distinct brown (10YR 4/3) redoximorphic concentrations; strongly effervescent; slightly alkaline; abrupt smooth boundary.
3Cg4--76 to 80 inches; grayish brown (2.5Y 5/2) clay; massive; very firm; few fine carbonate threads; few fine and medium light brownish gray (2.5Y 6/2) carbonate concretions; few fine rounded light brownish gray (2.5Y 6/2) carbonate nodules; strongly effervescent; slightly alkaline.
TYPE LOCATION: Woodbury County, Iowa; about 2 miles southwest of Sloan; about 1,840 feet west and 200 feet north of the southeast corner sec. 36, T. 86 N., R. 47 W.; USGS Albaton quadrangle; lat. 42 degrees 12 minutes 55.4 seconds N. and long. 96 degrees 15 minutes 28.2 seconds W., NAD 83
RANGE IN CHARACTERISTICS:
Thickness of mollic epipedon--16 to 24 inches
Depth to carbonates--greater than 36 inches
Content of clay in the particle-size control section (weighted average)--35 to 45 percent
Content of sand in the particle-size control section (weighted average)--less than 15 percent
Ap or A horizon:
Hue--10YR
Value--2 or 3
Chroma--1 or 2
Texture--silty clay loam or silty clay
Clay content--32 to 50 percent
Sand content--less than 20 percent
Soil reaction: strongly acid to neutral
Moist bulk density--1.20 to 1.50 g/cc
Overwash phases:
Texture--silt loam
Clay content--20 to 27 percent
Thickness--10 to 20 inches
Bg horizon:
Hue--10YR, 2.5Y, or 5Y
Value--3 or 4
Chroma--1 or 2
Texture--silty clay loam or silty clay
Clay content--35 to 48 percent
Sand content--10 to 20 percent, mostly very fine sand
Soil reaction--slightly acid to slightly alkaline
Moist bulk density--1.25 to 1.35 g/cc
C, Cg, 2Cg, or 3Cg horizon (if it occurs):
Hue--10YR or 2.5Y
Value--5 or 6
Chroma--2 to 4
Texture--very fine sandy loam, silt loam, loam, silty clay loam, clay loam, silty clay or clay
Clay content--15 to 70 percent
Sand content--1 to 70 percent
Rock fragment content--0 percent
Calcium carbonate equivalent: 2 to 15 percent
Reaction--slightly alkaline or moderately alkaline
Moist bulk density--1.10 to 1.50 g/cc
COMPETING SERIES: These are the
Collinwood,
Guckeen,
Kandiyohi,
Nameoki, and
Ocheda (T) series.
Collinwood--have a moist bulk density of 1.25 to 1.40 g/cc in the lower third of the series control section
Guckeen--have a sand content of 15 to 35 percent sand coarser than very fine sand in the particle-size control section
Kandiyohi--have carbonates within a depth of 36 inches and have a moist bulk density of 1.60 to 1.80 gm/cc in the lower third of the series control section
Nameoki--are in areas where the mean annual air temperature ranges from 54 to 57 degrees F.
Ocheda (T)--have a rock fragment content of 2 to 8 percent in the lower third of the series control section
GEOGRAPHIC SETTING:
Parent material--silty alluvium
Landform--flood plains
Slopes--0 to 2 percent
Elevation--950 to 1,260 feet above sea level
Mean annual air temperature--47 to 52 degrees F.
Mean annual precipitation--26 to 32 inches
Frost-free period--145 to 175 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Blencoe,
Keg,
Luton,
Salix, and
Tieville soils.
Blencoe--are in landform positions similar to those of the Lakeport soils and have a clay content of more than 50 percent in the upper two thirds of the particle-size control section
Keg--are in higher landscape positions and have a clay content of 20 to 26 percent in the particle-size control section
Luton--are in lower positions on the landscape and have a clay content of 45 to 60 percent in the particle-size control section
Salix--are in higher positions on the landscape and have a clay content of 16 to 35 percent in the particle-size control section
Tieville--are in slightly lower positions on the landscape and have carbonates within a depth of 10 inches
DRAINAGE AND PERMEABILITY:
Drainage class--somewhat poorly drained--a saturated zone occurs within a depth of 1 to 3 feet during March to June in most years and is considered apparent
Permeability--moderate to moderately slow
Surface runoff--low
Flooding--rare for brief periods during the months of February to November from precipitation events and snowmelt
USE AND VEGETATION:
Most areas are cultivated. Corn and soybeans are principal crops. Some areas are irrigated. The native vegetation is big bluestem, indiangrass, switchgrass, and other grasses of the tall grass prairie.
DISTRIBUTION AND EXTENT:
LRR M, MLRA 107; Missouri River flood plain in Iowa and South Dakota. This series is of moderate extent.
MLRA OFFICE RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Woodbury County, Iowa, 1971
REMARKS:
Particle-size control section--the zone from a depth of 10 to 40 inches (Ap2, A, Bg1, Bg2, and Bg3 horizons);
series control section--the zone from the surface to a depth of 60 inches (Ap1, Ap2, A, Bg1, Bg2, Bg3, 2Cg1, and 2Cg2 horizons).
Diagnostic horizons and features recognized in this pedon:
mollic epipedon--the zone from the surface to a depth of 22 inches (Ap and A horizons);
cambic horizon--the zone from a depth of 22 inches to 48 inches (Bg1, Bg2, and Bg3 horizons);
udic moisture regime.
Aquertic subgroup based on matrix color of Bg1 horizon and linear extensibility greater than 6.0 cm between the surface and a depth of 100 cm.
Taxonomy version--second edition, 1999.
Refer to DMUid 280,700 in NASIS for property data.
These soils were formerly included in certain areas of Kennebec, Monona, bench phase, and Salix soils in the previous soil survey of Woodbury County, Iowa.
ADDITIONAL DATA:
Laboratory data--National Soil Survey Laboratory, Lincoln, Nebraska pedon S95IA-193-008 (http://ssldata.sc.egov.usda.gov/).