Biogeochemical Cycles
  Spheres of B. Cycles
  Nitrogen Properties
  Simple Nitrogen Cycle
  Human Influences
  Spheres of the N Cycle
  Choose a Sphere



Contact Us:

From 1999 to 2004, Illinois State Water Survey scientists created a web site about the nitrogen cycle as an educational tool. The site is no longer actively maintained and some of the quantitative data may be out of date, but the basic discussion of principles and processes is still accurate and relevant.

For further information on nitrogen in various reservoirs, please contact the following people:

   Groundwater: Walt Kelly
   Surface Water: Laura Keefer
   Atmospheric: David Gay
   Soils and crops: UI Agricultural Extension