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 326 meters above sea level. (Colors are for moist soil unless otherwise stated.)
Ap1--0 to 10 centimeters; 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--10 to 30 centimeters; 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--30 to 56 centimeters; 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 horizon is 25 to 60 centimeters.)
Bg1--56 to 71 centimeters; 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--71 to 94 centimeters; 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--94 to 122 centimeters; 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 distinct dark yellowish brown (10YR 4/4) and many fine distinct light yellowish brown (10YR 6/4) redoximorphic concentrations; neutral; abrupt smooth boundary. (Combined thickness of the Bg horizon is 40 to 75 centimeters.)
2Cg1--122 to 147 centimeters; grayish brown (2.5Y 5/2) silt loam; massive; very friable; few distinct dark grayish brown (2.5Y 4/2) coats on surfaces along root channels and pores; few fine distinct dark yellowish brown (10YR 4/4), many medium prominent brown (7.5YR 4/4), and common fine distinct yellowish brown (10YR 5/4) redoximorphic concentrations; strongly effervescent; moderately alkaline; clear smooth boundary.
2Cg2--147 to 163 centimeters; 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--163 to 193 centimeters; 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 on surfaces along root channels and pores; few fine and medium light brownish gray (2.5Y 6/2) carbonate nodules; many fine distinct yellowish brown (10YR 5/4) and common fine faint brown (10YR 4/3) redoximorphic concentrations; strongly effervescent; slightly alkaline; abrupt smooth boundary.
3Cg4--193 to 200 centimeters; 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: Major Land Resource Area (MLRA) 107B-Iowa and Missouri Deep Loess Hills; Woodbury County, Iowa subset; about 2 miles southwest of Sloan; located about 1,840 feet west and 200 feet north of the southeast corner of section 36, T. 86 N., R. 47 W.; USGS Albaton topographic 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 the mollic epipedon--40 to 60 centimeters
Depth to carbonates--greater than 90 centimeters
Clay content in the particle-size control section (weighted average)--35 to 45 percent
Sand content 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 phase:
Texture--silt loam
Clay content--20 to 27 percent
Thickness--25 to 50 centimeters
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,
Muscotah,
Nameoki, and
Ocheda 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 that averages 15 to 35 percent in the particle-size control section
Kandiyohi--have carbonates within a depth of 90 centimeters and have a moist bulk density of 1.60 to 1.80 g/cc in the lower third of the series control section
Muscotah--have mollic epipedons greater than 90 centimeters thick
Nameoki--have a clay content that averages 45 to 60 percent in the upper part of the particle-size control section
Ocheda--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 in river valleys
Slope--0 to 2 percent
Elevation--185 to 610 meters above sea mean level
Mean annual air temperature--6 to 13 degrees C
Mean annual precipitation--585 to 1,040 millimeters
Frost-free period--150 to 220 days
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Blencoe,
Keg,
Luton,
Salix, and
Tieville soils.
Blencoe--are on landscape positions similar to those of the Lakeport soils and have a clay content that averages more than 50 percent in the upper two thirds of the particle-size control section
Keg--are on higher landscape positions and have a clay content that averages 20 to 26 percent in the particle-size control section
Luton--are on lower landscape positions and have a clay content that averages 45 to 60 percent in the particle-size control section
Salix--are on higher landscape positions and have a clay content that averages 16 to 35 percent in the particle-size control section
Tieville--are on slightly lower landscape positions and have carbonates within a depth of 25 centimeters
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat poorly drained--a frequently saturated zone occurs within a depth of 0.3 to 1 meter during the wettest periods of years when precipitation is within one standard deviation of the 30 year mean of annual precipitation, this saturation is considered apparent
Saturated hydraulic conductivity--1.0 to 10 micrometers per second
Flooding--rarely flooded for brief duration
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:
Physiographic Division--Interior Plains
Physiographic Province--Central Lowland
Physiographic sections--Dissected till plains and Western lake section
MLRAs--Till Plains (102B), Loess Uplands (102C), and Iowa and Missouri Deep Loess Hills (107B)
LRR M; along the Missouri River in Iowa and South Dakota
Extent--moderate
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Indianapolis, Indiana; MLRA SSO 10-6 (Atlantic, Iowa)
SERIES ESTABLISHED: Woodbury County, Iowa, 1971
REMARKS:
Particle-size control section--the zone from a depth of 25 to 100 centimeters;
series control section--the zone from the surface to a depth of 150 centimeters.
Diagnostic horizons and features recognized in this pedon include:
mollic epipedon--the zone from the surface to a depth of 56 centimeters (Ap and A horizons);
cambic horizon--the zone from a depth of 56 to 122 centimeters (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--Keys to Soil Taxonomy, tenth edition, 2006.
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/).