Nitrogen in the atmosphere, Nitrogen Fixation-Atmospheric nitrogen cannot be used directly by plants., Nitrogen-fixing bacteria, especially Rhizobium, which live in root nodules of leguminous plants like clover or peas, Nitrification, Nitrosomonas bacteria convert ammonium (NH₄⁺) into nitrite (NO₂⁻), Nitrite, Nitrobacter bacteria convert nitrite (NO₂⁻) into nitrate (NO₃⁻)., Decomposers, Ammonification- When animals excrete waste or plants and animals die, decomposers (bacteria and fungi) break down organic nitrogen compounds into ammonium (NH₄⁺), Plants absorb nitrate (NO₃⁻) from the soil and use it to make proteins., Assimilation, Animals then obtain nitrogen by eating plants or other animals., Denitrifying bacteria, Denitrification- Denitrifying bacteria convert nitrates (NO₃⁻) back into nitrogen gas (N₂), which is released into the atmosphere..

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