Soil Survey of McHenry County, Illinois Part I - Soil Data Mart

McHenry County, Illinois—Part I 87
Taxonomic classification: Fine-loamy over sandy or
sandy-skeletal, mixed, mesic Typic Argiudolls
Typical Pedon for MLRA 95B
Typical pedon of Lorenzo loam, 2 to 4 percent slopes,
1,800 feet north and 960 feet west of the southeast
corner of sec. 18, T. 43 N., R. 6 E.
Ap—0 to 8 inches; very dark brown (10YR 2/2) loam,
dark grayish brown (10YR 4/2) dry; weak medium
subangular blocky structure parting to weak fine
and medium granular; friable; common very fine
roots; 1 percent gravel; slightly acid; abrupt
smooth boundary.
Bt1—8 to 12 inches; 95 percent dark yellowish brown
(10YR 4/4) and 5 percent very dark brown (10YR
2/2) clay loam; moderate fine and medium
subangular blocky structure; friable; common very
fine roots; few distinct dark yellowish brown (10YR
3/4) and dark brown (10YR 3/3) clay films on
faces of peds; 5 percent gravel; neutral; clear
smooth boundary.
Bt2—12 to 18 inches; dark yellowish brown (10YR
4/4) sandy clay loam; weak medium subangular
blocky structure; friable; common very fine roots;
few distinct dark yellowish brown (10YR 3/4) and
dark brown (10YR 3/3) clay films on faces of
peds; 8 percent gravel; slightly acid; abrupt
smooth boundary.
2C—18 to 60 inches; dark yellowish brown (10YR 4/4)
very gravelly loamy sand and very gravelly sand;
single grain; loose; common very fine roots; 32
percent gravel and 5 percent cobbles; strongly
effervescent; slightly alkaline.
MLRA Series Range in Characteristics
Thickness of the mollic epipedon: 6 to 15 inches
Depth to sandy and gravelly deposits: 10 to 24 inches
Depth to carbonates: 10 to 24 inches
Thickness of the solum: 12 to 24 inches
Ap or A horizon:
Hue—7.5YR or 10YR
Value—2 or 3
Chroma—1 or 2
Texture—loam, silt loam, or sandy loam
Bt horizon:
Hue—7.5YR or 10YR
Value—4 or 5
Chroma—3 or 4
Texture—clay loam, loam, sandy clay loam, or the
gravelly analogs of these textures
Content of gravel—5 to 35 percent
2C horizon:
Hue—7.5YR or 10YR
Value—4 or 5
Chroma—3 to 6
Texture—the gravelly, very gravelly, or extremely
gravelly analogs of sand, loamy sand, coarse
sand, or loamy coarse sand
Content of gravel—20 to 70 percent
318A—Lorenzo loam, 0 to 2 percent
slopes
Setting
Landform: Stream terraces, kames, outwash plains,
and moraines
Position on the landform: Summits
Slope range: 0 to 2 percent
A typical soil series description with range in
characteristics is included, in alphabetical order, in this
section. Additional information specific to this map
unit, such as horizon depth and textures, is available
in the “Soil Properties” section in Part II of this
publication.
Composition
Lorenzo and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that have a lighter colored surface layer
• soils that contain sandy and gravelly deposits at a
depth of more than 24 inches
• soils that have slopes of more than 2 percent
• soils that contain loamy till in the lower part of the
profile
Dissimilar soils:
• the somewhat poorly drained Kane soils in the
lower positions on the landform
• the excessively drained Rodman soils in the slightly
higher positions on the landform
• the poorly drained Will soils in depressions and
drainageways
Management
For general and detailed information about
managing this map unit, see the following sections in
Part II of this publication:
• “Agronomy” section
• “Wildlife Habitat” section
• “Engineering” section
• “Soil Properties” section