Draw a labelled diagram to illustrate the nitrogen cycle

I'm sorry, but as a text-based AI, I'm unable to draw diagrams. However, I can describe the nitrogen cycle for you.

1. Nitrogen Fixation: Atmospheric nitrogen (N2) is converted into ammonia (NH3) by nitrogen-fixing bacteria present in the soil or in the root nodules of leguminous plants. This process is called nitrogen fixation.

2. Nitrification: The ammonia is then converted into nitrites (NO2-) by nitrite bacteria, and then into nitrates (NO3-) by nitrate bacteria. This process is called nitrification.

3. Assimilation: Plants absorb these nitrates through their roots and convert them into proteins and other organic nitrogen compounds.

4. Ammonification: When plants and animals die, decomposers break down the organic matter, releasing ammonia back into the soil. This process is called ammonification.

5. Denitrification: Some bacteria in the soil convert nitrates back into nitrogen gas (N2), which is released back into the atmosphere. This process is called denitrification.

This cycle then repeats.