Soil-dwelling bacteria change organic nitrogen compounds into inorganic nitrogen that plants can utilise. Plant roots absorb nitrogen, which is then incorporated into the plant's organic materials.
Nitrogen-fixing bacteria in the soil and in the root nodules of some plants turn atmospheric nitrogen gas into ammonia. Nitrifying bacteria transform ammonia into nitrites or nitrates. All three forms of fixed nitrogen—ammonia, nitrites, and nitrates—can be absorbed by plants.
The action of creatures referred to as decomposers releases nitrogen back into the atmosphere. Some bacteria breakdown and disintegrate the intricate nitrogen molecules.
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