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Major sections are shown in gray.   1. Overview     Instructions to Reviewers     Illinois State Water Survey (ISWS) Home     Illinois Council on Food and Agricultural Research (C-FAR) Home     Glossary     View splash page 2. Biogeochemical Cycle 3. Spheres of Biogeochemical Cycles 4. Nitrogen Properties     Nitrogen Species         Examples Of Organic N Measurements     Transformations of Nitrogen Species         N Speciation Under Varying Oxidation-Reduction Conditions     Biological Processes Involving N 5. Simplified Nitrogen Cycle     Abridged Version Full Text Version 6. Human Influences on the Nitrogen Cycle 7. Spheres of the Nitrogen Cycle 8. Choose a Nitrogen Cycle Sphere     Atmosphere Biosphere    Nitrogen Properties    Human Influences Geosphere    Nitrogen Properties Hydrosphere    N species   Also: Show Terms   Glossary   Search   Menu HELP