Nitrogen cycle

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Nitrogen cycle

• Notebook 7

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• Nitrogen makes up 80 of the atmosphere
• It is essential for the synthesis of_______
• Atmospheric nitrogen is not usable by living
  things because 2 atoms of N are joined with a
  triple bond

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Nitrogen fixation(converting N2 to nitrates)

• Fixation by lightening
• Fixation by bacteria in the roots of (some) plants

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Passing on the nitrogen

• Nitrification producing nitrate from ammonia
• Decomposition breaking down proteins in to
  ammonia
• Denitrification producing nitrogen gas from
  nitrate

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The human factor

• Farmers add huge amounts of nitrogen to the soil
• Much of it is not used and gets into ground
  water, lakes and streams

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