Post on 17-Jan-2016
transcript
T3-1 Soil Science and Management, 4E
Chapter 3
Soil Classification
and Survey
T3-2 Soil Science and Management, 4E
Objectives
• Describe the current USDA soil classification system
• Explain how soil surveys are prepared and used
• List soil capability classes
T3-3 Soil Science and Management, 4E
Terms to Know• Diagnostic horizons• Families• Great groups• Land capability classes• Land capability
subclasses• Mapping units• Phases• Soil association
• Soil classification• Soil order• Soil series• Soil survey• Soil taxonomy• Subgroups• Suborders
T3-4 Soil Science and Management, 4E
Soil Classification
Figure 3-1
T3-5 Soil Science and Management, 4E
Figure 3-2
Soil Classification
T3-6 Soil Science and Management, 4E
Soil Classification
• Soil series
• Phases of soil series
T3-7 Soil Science and Management, 4E
Soil Classification
Figure 3-6
• Field mapping
T3-8 Soil Science and Management, 4E
Soil Classification
• Mapping units
• Soil survey reports
• Survey report uses
• Field maps
T3-9 Soil Science and Management, 4E
Land Capability Classes
• Capability classes
Figure 3-7
T3-10 Soil Science and Management, 4E
Land Capability Classes
• Land capability subclasses
• Soil use maps
• Computer applications
• Lands of the United States
T3-11 Soil Science and Management, 4E
Land Capability Classes
Figure 3-13
T3-12 Soil Science and Management, 4E
Land Capability Classes
Figure 3-14
T3-13 Soil Science and Management, 4E
Summary• Soil classified by soil properties and profiles
– Six levels• Level important to growers is soil series
and its subdivision—the soil phase– Soil maps prepared on classification system– Land placed into a capability classes
• Classes determine needs of soil