N2 - 78 - 79% of the Atmosphere (fairly un-reactive)
1) Plants:
- NO3 (nitrate) ---> Amino acids ----> Protein (required for growth)
- DNA controls growth
2) Lightning combines N2 + O2 ---> NO3
3) Plants take in Nitrate to form Amino Acids which contain C.H.O.N. ---> Proteins
4) Food Chain:
- Producer ---> Primary Consumer ---> Secondary Consumer
- The nitrogen passes through the trophic levels in feeding in the form of protein
5) Animal - Nitrogen excretion (Urea + H20 ---> Urine)
- Return of nitrogen from the trophic levels back into soil
6) Death - Decomposers:
- Take the Urine/Urea along with the decaying organic molecules making ammonia (NH3)
7) Ammonia is converted into NO2 - (nitrite) ----> NO3 (Nitrate)
- This is done by a group of bacteria by: nitrifying bacteria
8) Plants:
- In the soil a bacteria called free-living, it takes atmospheric nitrogen (in air/soil) and turn it into nitrate
- Nodules in Leguminous plants such as Beans and clover. These plants also take in atmospheric nitrogen and turn it into nitrate for the plants
9) Denitrifying Bacteria:
- They take nitrate and convert it back to nitrogen and completing the cycle.
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