Fixating on Nitrogen and Spreading Manure

Nitrogen is the most common substance in the atmosphere, existing mostly as two atoms held together by a triple bond. Nitrogen enters the system through the activity of various bacteria (some associated with plants but others free living). Nitrogen in natural systems also falls with rain... lightening will fuse nitrogen and oxygen together in several water soluble configurations (also fusing oxygen to itself forming ozone, O3). Ever noticed how green things look after a thunderstorm? In part because there was a dose of N added.