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Evaporation and Transpiration
Precipitation and Runoff
Free nitrogen is found in the air (N 2 ) (this is NOT the usable form of Nitrogen that humans need). Nitrogen Fixation occurs on the small nodules (found on legume roots such as clover, peas, beans, and alfalfa) to fix free nitrogen from the air directly into simple compounds that the plants can use nitrogen gas (N 2 ) to ammonia(NH 3)
Nitrification is the process, which converts the ammonia (NH 3 ) into nitrite ions (NO 3 ) which the plantscan take in as nutrients.
After all of the living organisms have used the nitrogen, decomposer bacteria convert the nitrogen-rich waste compounds into simpler ones and convert the simple nitrogen compounds back into nitrogen gas (N)
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