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

McHenry County, Illinois—Part I 89
Composition
Lorenzo and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that are severely eroded
• 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 less than 6 percent or
more than 12 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
Martinsville Series
Drainage class: Well drained
Permeability: Moderate
Landform: Outwash plains and stream terraces
Parent material: Loamy outwash
Slope range: 0 to 6 percent
Taxonomic classification: Fine-loamy, mixed, mesic
Typic Hapludalfs
Typical Pedon for MLRA 95B
Typical pedon of Martinsville silt loam, 0 to 2 percent
slopes, 660 feet north and 910 feet west of the
southeast corner of sec. 15, T. 28 N., R. 11 E.
Ap—0 to 9 inches; dark grayish brown (10YR 4/2) silt
loam, light brownish gray (10YR 6/2) dry;
moderate medium granular structure; friable;
many very fine roots; neutral; abrupt smooth
boundary.
BE—9 to 12 inches; 55 percent brown (10YR 5/3) and
45 percent brown (10YR 4/3) loam; moderate
medium subangular blocky structure; friable; many
very fine roots; slightly acid; abrupt smooth
boundary.
Bt1—12 to 19 inches; dark yellowish brown (10YR
4/4) loam; moderate medium subangular blocky
structure; friable; common very fine roots; few
distinct very dark grayish brown (10YR 3/2)
organo-clay films on faces of peds; neutral; clear
smooth boundary.
Bt2—19 to 31 inches; dark yellowish brown (10YR
4/4) clay loam; weak coarse prismatic structure
parting to moderate fine subangular blocky;
friable; common very fine roots; few distinct brown
(10YR 4/3) clay films on faces of peds; few distinct
pale brown (10YR 6/3) uncoated silt and sand
grains on faces of peds; neutral; clear smooth
boundary.
Bt3—31 to 37 inches; dark yellowish brown (10YR
4/4) loam; moderate medium subangular blocky
structure; friable; common very fine roots; few
distinct brown (10YR 4/3) clay films on faces of
peds; few fine black (10YR 2/1) very weakly
cemented iron and manganese oxide concretions
throughout; strongly acid; abrupt smooth
boundary.
Bt4—37 to 49 inches; dark yellowish brown (10YR
4/4) sandy loam; weak medium subangular blocky
structure; very friable; few very fine roots;
common distinct brown (10YR 4/3) clay films on
faces of peds; moderately acid; clear smooth
boundary.
Bt5—49 to 58 inches; dark yellowish brown (10YR
4/4) sandy loam; weak coarse subangular blocky
structure; very friable; few very fine roots; few
distinct brown (10YR 4/3) clay films on faces of
peds; moderately acid; gradual smooth boundary.
C—58 to 64 inches; dark yellowish brown (10YR 4/4)
sandy loam; massive; very friable; neutral.
MLRA Series Range in Characteristics
Depth to carbonates: Greater than 40 inches
Thickness of the solum: 40 to 70 inches
Ap or A horizon:
Hue—10YR
Value—3 or 4
Chroma—2 or 3
Texture—loam, silt 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—loam, silt loam, sandy loam, or fine
sandy loam