The limiting portion of the nitrogen cycle for plants is often the conversion of atmospheric nitrogen into usable forms.
The process known as nitrogen fixation, which transforms atmospheric nitrogen into forms that plants can use, is frequently the limiting component of the nitrogen cycle for plants. Certain nitrogen-fixing bacteria can accomplish this by converting ambient nitrogen into ammonia or other similar chemicals.
Plants may experience restrictions in their nitrogen supply, which could affect their growth and development, if there are insufficient nitrogen-fixing bacteria or other sources of fixed nitrogen.