Please enable JavaScript.

Coggle requires JavaScript to display documents.

Soil Phosphorus (Benefits (Essential nutrient for plants and animals…

- - - - Different P rocks
      - Manufacture
      - Additional elements present/added
  - - - Monocalcium phosphate
      - 8-10% P
      - Made by reacting ground phosphate rock with sulfuric acid
      - Bonus element - sulphur
    - - Monocalcium phosphate
      - 15-21% P
      - Made by reacting ground phosphate rock with phosphoric acid
    - - Tricalcium phosphate with OH-, carbonate
      - Organic Farming
      - Less immediately available
- - - - Phosphorus in active organic matter
        
        Phosphorus in passive organic matter
      - Organic P 20-80% total P
      - Derived from plant/animal/microbial tissue
      - Microbial P important for P cycling despite relatively small size of microbial P pool
    - - Mono- and di-calcium phosphates (SSP)
      - Usually dissolve in acidic conditions
      - React to form insoluble tri-calcium phosphates at high pH
      - Slowly soluble Ca phosphates
    - - Precipitates under acidic conditions
      - Phosphate reacts with soluble Fe3+ and Al3+ to precipitate insoluble Fe and Al phosphates
      - Occluded (minerals)
        
        Within parent material - released by weathering
        
        Give rise to native soil P
        
        Mainly apatite minerals (tricalcium phosphates - fluoroapatite, chlorapatite, hydroxyapatite)