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Soil Texture & Structure (Importance of soil structure (Productivity…

- - - - Weathered rock fragments
      - Chemically inert
      - Important for physical properties - air and water transport through soil
        
        Drainage
        
        Aeration
        
        Cultivation
    - - Important for physical properties - air and water transport through soil
        
        Drainage
        
        Aeration
        
        Cultivation
      - Chemically inert
      - Weathered rock fragments
    - - Negatively charged
      - Easily waterlogged
      - High water holding capacity
      - Relatively large reactive surface area
- - - - Development of cracks in soil separates peds and gives them their shape
    - - Pedal
        
        Obvious development of soil structure
        
        Strong pedality - >75% peds
        
        Moderate pedality 25-75% peds
        
        Weak pedality 15-25% peds
      - Apedal
        
        Little or no structural development
        
        Creates land use problems
- - - - Transmission pores (30-300um diameter)
      - Air pores (>300um diameter)
    - - Residual pores (<0.2um diameter)
      - Storage pores (0.2-30um diameter)
- - - - Opposite charges
        
        Organic matter - solid/soluble
        
        Fe and Al oxides
      - van der Waals bonds
      - Cations
        
        Hydration spheres