N Cycle Chapter
Additions	Removal/Losses
Symbiotic N Fixation	Forage/grain removal
Industrial Fixation	Ammonia Volatilization
Fixation in Lightning	Leaching
Plant and Animal Residue	Plant N Loss
Fertilization	Denitrification
	Soil Plant Inorganic N Buffering
Nitrogen Cycle (Power Point File)	Interactive Nitrogen Cycle

The Microbial World: The Nitrogen Cycle Explained

References:

Raun, William R., Gordon V. Johnson, Jeffory A. Hattey, Shannon L. Taylor and Heather L. Lees. 1997. Nitrogen cycle ninja, a teaching exercise. J. Nat. Resour. Life Sci. Educ. 26:39-42.

Nitrogen Cycle from "Growing Point Magazine", March 2005