Washington State University

Organic Farming Systems and Nutrient Management

Soils and Soil Testing

How to collect soil samples:

Determining Soil Properties:

Soil Testing Laboratories:

Interpreting Soil Test Results:

La Composición y Análisis de Suelos:


Soil profile

General Soil Information:

  • Soils of the Puget Sound Area A set of 29 slides that show the major soil types of the Puget Sound area, how they are related to local geology, and their suitability and limitations for different types of land use. C.G. Cogger.
  • The Soil Biology Primer A useful guide to the types and roles of soil organisms and soil ecosystems. Many color photos. View on-line or order paper copy from the USDA. From the Soil Quality Institute, United States Department of Agriculture-Natural Resources Conservation Service.
Giddings Soil Probe

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