Denitrifying bacteria reducing NO3 to N2., Nitrogen fixation by nitrifying bacteria such as Azotobacter., Bacterial Oxidation by Nitrosomonas, Further oxidation by bacteria such as Nitrobacter, Ionising processes such as lightning strikes - N2 + O2 --> NOx, Nitrogen Fixation by rhizome bacteria in plants such as legumes., Absorption of nitrates by roots., Death and Leaf fall, Amonification through decomposition by detritovores., Eating, Consumption, Death and Excretion e.g Urea.

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