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

McHenry County, Illinois—Part I 61
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
Harvard and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that have a lighter colored surface layer
• soils that have a thicker surface layer
• soils that contain loamy outwash at a depth of more
than 40 inches
• soils that contain sandy and gravelly deposits in the
lower part of the profile
Dissimilar soils:
• the somewhat poorly drained Brenton and Millbrook
soils 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
• “Wildlife Habitat” section
• “Engineering” section
• “Soil Properties” section
344B—Harvard silt loam, 2 to 5 percent
slopes
Setting
Landform: Outwash plains and stream terraces
Position on the landform: Summits, shoulders, and
backslopes
Slope range: 2 to 5 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
Harvard and similar soils: 85 percent
Dissimilar soils: 15 percent
Similar soils:
• soils that have a lighter colored surface layer
• soils that have a thicker surface layer
• soils that contain loamy outwash at a depth of more
than 40 inches
• soils that contain sandy and gravelly deposits in the
lower part of the profile
Dissimilar soils:
• the somewhat poorly drained Brenton and Millbrook
soils 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
• “Wildlife Habitat” section
• “Engineering” section
• “Soil Properties” section
Herbert Series
Drainage class: Somewhat poorly drained
Permeability: Moderate in the upper part and
moderately slow in the lower part
Landform: Moraines and till plains
Parent material: Silty material and the underlying
loamy till
Slope range: 0 to 2 percent
Taxonomic classification: Fine-silty, mixed, mesic
Udollic Epiaqualfs
Typical Pedon for MLRA 95B
Typical pedon of Herbert silt loam, 335 feet south and
306 feet east of the northwest corner of sec. 14, T. 42
N., R. 4 E.
Ap—0 to 8 inches; very dark brown (10YR 2/2) silt
loam, dark grayish brown (10YR 4/2) dry;
moderate very fine granular structure; friable;
many very fine and fine roots; slightly acid; abrupt
smooth boundary.
E—8 to 12 inches; dark grayish brown (10YR 4/2) silt
loam; weak medium and thick platy structure
parting to moderate fine granular; friable; many
very fine roots; few fine faint brown (10YR 5/3)
masses of iron accumulation in the matrix; slightly
acid; clear smooth boundary.
Bt1—12 to 16 inches; brown (10YR 4/3) silty clay
loam; moderate very fine subangular blocky
structure; firm; many very fine roots; common
distinct discontinuous dark grayish brown (10YR
4/2) clay films on faces of peds; few fine faint
brown (10YR 5/3) masses of iron accumulation in
the matrix; few fine distinct grayish brown (2.5Y