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Spoiler
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Plants absorb nitrates (NO3-) from the soil.
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Plants use the nitrates and compounds from respiration to form amino acids (amongst other things such as ATP and nucleic acids).
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The amino acids are used to synthesise proteins.
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The plants are eaten by animals, the proteins digested into amino acids, the amino acids are absorbed and assimilated into animal proteins.
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Both plants and animals excrete and die, leaving a collection of materials which contain the nitrogen still in organic molecules (e.g. detritus).
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Decomposers (saprophytes) decay the excretory products and detritus, releasing ammonia (NH3) into the soil - Ammonification.
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Nitrifying bacteria oxidise the ammonia first into nitrites (NO2-) then to nitrates (NO3-) - nitrification -, which are taken up by the plants.
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