Nitrogenous Fertilisers (Man-made Fertilisers)

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  • Created by: Katy **
  • Created on: 19-04-14 16:45
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  • Nitrogenous Fertilisers
    • Fertiliser
      • substance used to put nutrients into soil for healthy plant growth
      • nitrogenous
        • contains nitrogen
          • protein
    • Made from
      • ammonia
        • main use
        • react with acid
          • neutralisation
      • Ammonia + Nitric acid ? Ammonium nitrate
        • NH3 + HNO3 ? NH4NO3
      • Ammonia + Sulfuric acid ? Ammonium sulfate
        • NH3 + H2SO4 ? (NH4)2 SO4
    • Disadvantages
      • eutrophication
        • water soluble
        • washed by rain to water source
        • contributes to nitrate pollution of water
        • causes excess growth of algae
        • algae die = bacteria decompose the decaying algae
        • bacteria use dissolved oxygen = low oxygen levels = fish die
      • intensive farming
        • reduce in biodiversity
        • loss of habitats
    • Advantages
      • produce large yields
      • arable lands
      • keep down food price
      • avoids food shortages

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