5 steps in the Nitrogen Cycle

Created by papereverbloom 

Upgrade to
remove ads

Nitrogen fixation

1. conversion of atmospheric nitrogen into ammonia, performed by bacteria in the roots of legumes or lightning. N2 --> NH3


2. conversion of ammonia to nitrite to nitrate performed by bacteria. NH3 --> NO2 --> NO3-


3. inorganic nitrogen is uptaken by the roots of plants and becomes part of the food chain. NO3- --> organic nitrogen (proteins and nucleic acids)


4. conversion of organic nitrogen into ammonia. Performed by decomposers (bacteria, fungus) to return nitrogen to the soil. Organic nitrogen --> NH3


5. nitrates are returned to the atmosphere by anaerobic bacteria. NO3- --> N2

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set