How does decomposition contribute to the nitrogen cycle?

Decomposition is a critical step in the nitrogen cycle as it converts organic nitrogen present in dead organisms into forms that plants can use.

When plants and animals die, their proteins and nucleic acids contain organic nitrogen. Decomposers such as bacteria and fungi break down these complex compounds into simpler substances like ammonia through a process called ammonification.

This ammonia is then converted into nitrites and nitrates by nitrifying bacteria in the soil. Plants absorb these nitrates as a primary source of nitrogen for synthesizing proteins and other essential biomolecules.

Animals obtain nitrogen by consuming plants or other animals, and the cycle continues. Without decomposition, nitrogen would remain locked in dead matter and would not be available for reuse.

Thus, decomposition ensures the continuous recycling of nitrogen, supporting plant growth and maintaining ecosystem productivity.