Table of Contents
Introduction to Soil Science in Sustainable Agriculture
Soil Components
PPT Slide
PPT Slide
Soil pores and water movement
Soil properties that affect porosity
Soil Particle Sizes
Approximate surface areas of 1 gram samples
PPT Slide
PPT Slide
Soil Structure
Formation of soil structure
Soil Structure
Major soil types of the Puget Sound area
Most local soils formed from glacial materials
PPT Slide
PPT Slide
PPT Slide
PPT Slide
Soil fertility and nutrient management
Nutrient Management
Plant Nutrients
PPT Slide
Nutrient Anion Availability
Nitrogen Cycle
Organic Materials
Organic Materials: Slow release nutrients
Slow release nutrients
Nutrient uptake
Organic materials: Fertilizers vs. Soil amendments
Carbon:Nitrogen ratio
C:N ratio and N availability
High N Content C:N < 10:1
High N Content Examples
Moderate N Content C:N 12:1 to 25:1
Moderate N Content Examples
Low N content C:N > 30:1
Low N content Examples
Soil Testing
What is a soil nutrient test?
Soil Nutrient Tests
When to sample?
How often to sample?
How to sample
Sample handling
Choosing a lab
Interpreting soil tests
Web sites
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