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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     Terms:     Element/Compound     Fluxes     Inputs/Outputs/Storage     Mediating Factors     Transformations 3. Spheres of Biogeochemical Cycles 4. Nitrogen Properties     Nitrogen Species         Terms:         Henry's Law         Examples Of Organic N Measurements     Transformations of Nitrogen Species         Terms:         Oxidation & Reduction         Oxidation States         N Speciation Under Varying Oxidation-Reduction Conditions     Terms:     Henry's Law     Isotopes     Oxidation & Reduction     Oxidation States     Nitrogen Fixation     Biological Processes Involving N 5. Simplified Nitrogen Cycle     Abridged Version Full Text Version     Terms:     Ammonia, Ammonium Ion     Anthropogenic inputs and outputs     Inputs/Outputs/Storage     Mediating Factors     Nitric Acid/Nitrate Ion     Nitric Oxide     Nitrogen Dioxide     Nitrous Oxide     Organic N     Oxidation & Reduction 6. Human Influences on the Nitrogen Cycle 7. Spheres of the Nitrogen Cycle     Terms:     Mediating Factors     Nitrogen Properties     Oxidation & Reduction 8. Choose a Nitrogen Cycle Sphere     Atmosphere    Terms:       Organic N Biosphere    Nitrogen Properties    Human Influences Geosphere    Nitrogen Properties    Terms:       Core       Crust       Mantle       Minerals       Oxidation & Reduction       Oxidation States Hydrosphere    N species    Terms:       Henry's Law   Also: Hide Terms   Glossary   Search   Menu HELP