Nitrogen Fixation: Nitrogen gas converted to Ammonium ions, Done industrially via the Haber Process, Occurs when lightning hits the soil, By Nitrogen-fixing bacteria, In root nodules of legumes by Rhizobium, The bacteria that do this process are 'mutualistic', Ammonification: Involves saprobiants, Nitrogen containing compounds eg. waste and dead organisms are broken down by bacteria, Convert Nitrogen containing compounds to ammonium ions in the soil, Nitrification: By nitrifying bacteria, Ammonium ions in soil are changed into nitrates., Nitrates taken up by active transport, Ammonium ions converted to Nitrites, Nitrites converted to Nitrates, Denitrification: Conversion of nitrates into nitrogen gas, By denitrifying bacteria, Waterlogging of soil gives low oxygen conditions for bacteria, Bacteria respire anaerobically,

A Level Nitrogen Cycle

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