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

McHenry County, Illinois—Part I 125
Bt3—31 to 40 inches; 70 percent brown (7.5YR 4/4)
and 30 percent brown (7.5YR 5/4) loam; weak
medium prismatic structure parting to weak
medium subangular blocky; firm; common very
fine roots; very few distinct brown (7.5YR 4/3) clay
films on faces of peds and in pores; very few
distinct dark brown (7.5YR 3/2) organo-clay films
in root channels and in pores; common fine and
medium very dark gray (10YR 3/1) wormcasts; 5
percent gravel; slightly effervescent; slightly
alkaline; gradual smooth boundary.
C—40 to 60 inches; brown (7.5YR 5/4) loam; massive;
firm; common very fine roots; 5 percent gravel;
strongly effervescent; moderately alkaline.
MLRA Series Range in Characteristics
Thickness of silty material: Less than 18 inches
Depth to carbonates: 20 to 40 inches
Thickness of the solum: 24 to 40 inches
Ap or A horizon:
Hue—10YR
Value—3 or 4 (4 to 6 dry)
Chroma—1 to 3
Texture—silt loam, loam, sandy loam, or fine
sandy loam
E horizon (if it occurs):
Hue—7.5YR or 10YR
Value—4 or 5
Chroma—2 to 4
Texture—silt loam, loam, sandy loam, or fine
sandy loam
Bt horizon:
Hue—5YR, 7.5YR, or 10YR
Value—4 to 6
Chroma—3 to 6
Texture—clay loam or loam
C horizon:
Hue—5YR, 7.5YR, or 10YR
Value—5 or 6
Chroma—3 or 4
Texture—loam or sandy loam
Content of gravel—less than 15 percent
618E—Senachwine silt loam, 12 to 20
percent slopes
Setting
Landform: Moraines
Position on the landform: Backslopes
Slope range: 12 to 20 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
Senachwine and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that are moderately eroded
• soils that have a darker subsurface layer
• soils that contain carbonates at a depth of less than
20 inches or more than 40 inches
• soils that have slopes of less than 12 percent or
more than 20 percent
Dissimilar soils:
• the somewhat poorly drained Herbert soils in the
lower positions on the landform
• Fox soils, which contain sandy and gravelly
deposits at a depth of less than 40 inches; in the lower
positions on the landform
• the poorly drained Pella soils in drainageways
Management
For general and detailed information about
managing this map unit, see the following sections in
Part II of this publication:
• “Agronomy” section
• “Forestland” section
• “Wildlife Habitat” section
• “Engineering” section
• “Soil Properties” section
618F—Senachwine silt loam, 20 to 30
percent slopes
Setting
Landform: Moraines
Position on the landform: Backslopes
Slope range: 20 to 30 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
Senachwine and similar soils: 85 percent
Dissimilar soils: 15 percent