Chapter 3 Soil Classification and Survey T 3

Chapter 3 Soil Classification and Survey T 3 - Soil Science and Management, 4 E

Objectives • Describe the current USDA soil classification system • Explain how soil surveys are prepared and used • List soil capability classes T 3 - Soil Science and Management, 4 E

Terms to Know • • • Diagnostic horizons Families Great groups Land capability classes Land capability subclasses • Mapping units • Phases • Soil association T 3 - • • Soil classification Soil order Soil series Soil survey Soil taxonomy Subgroups Suborders Soil Science and Management, 4 E

Soil Classification Figure 3 -1 T 3 - Soil Science and Management, 4 E

Soil Classification Figure 3 -2 T 3 - Soil Science and Management, 4 E

Soil Classification • Soil series • Phases of soil series T 3 - Soil Science and Management, 4 E

Soil Classification • Field mapping Figure 3 -6 T 3 - Soil Science and Management, 4 E

Soil Classification • • T 3 - Mapping units Soil survey reports Survey report uses Field maps Soil Science and Management, 4 E

Land Capability Classes • Capability classes Figure 3 -7 T 3 - Soil Science and Management, 4 E

Land Capability Classes • • T 3 - Land capability subclasses Soil use maps Computer applications Lands of the United States Soil Science and Management, 4 E

Land Capability Classes Figure 3 -13 T 3 - Soil Science and Management, 4 E

Land Capability Classes Figure 3 -14 T 3 - Soil Science and Management, 4 E

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 T 3 - Soil Science and Management, 4 E