- Global Population and the Nitrogen Cycle
 (PDF) - Looks at how the distribution of nitrogen on the earth has been changed in dramatic, and sometimes dangerous, ways by modern agricultural practices. - Human Alteration of the Global Nitrogen Cycle: Causes and Consequences
- Describes the nitrogen cycle and explores how humans have increased the amount and rate of nitrogen being cycled through the living world, soil, water, and atmosphere.
- Microbial World: The Nitrogen Cycle and Nitrogen Fixation
- Looks at the role of nitrogen in the biosphere.
- Nitrogen Cycle Project
- Provides an improved scientific basis for developing mathematical process models that simulate the biogeochemical cycling of nitrogen in Illinois' environments.
- Nitrogen Cycle, The
- From the online text Fundamentals of Physical Geography.
- Nitrogen Fixation
- Covers the range of organisms that can fix nitrogen, the physiology and anatomy of nitrogen fixation, and the ecology of nitrogen fixation.
- Nitrogen Fixation Research Center - National Autonomous University of Mexico
- With programmes in computational genomics, metabolic engineering, microbial and molecular ecology, and plant molecular biology.
- Nitrogen in the Environment: Nitrogen Cycle
- Offers a basic look at the nitrogen cycle.
- Nitrogen Saturation in Temperate Forest Ecosystems
- Looks at how increasing the nitrogen supply can induce a complex series of alterations to soil and plant biogeochemistry may affect productivity, competition, and microbial community structure.
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