The environment is stabilized by biogeochemical cycles. Biogeochemical cycles are the processes that occur naturally and recycle nutrients in different chemical forms from the non-living ecosystem to the living organisms and then back to the non-living ecosystem. Biogeochemical cycles consist of five cycles which are iron cycle, sulfur cycle, phosphorus cycle, nitrogen cycle and carbon cycle. The most important and complex of the biogeochemical cycles is the nitrogen cycle (Botkin & Keller, 2012). The nitrogen cycle allows various nitrogenous species to circulate between inert nitrogen gas in the atmosphere and in the soil (Newton, 1999). According to Newton (1999), “the nitrogen gas molecule is fixed by both natural processes, which include biological and non-biological systems (lightning, combustion, and volcanism), and by artificial processes (principally industrial ammonia production)” (p. 1). There are four processes in the nitrogen cycle, namely nitrogen fixation, decomposition, nitrification and finally denitrification (refer to Figure 1 in Appendix 1). First, the cycle involves nitrogen fixation. Nitrogen fixation is a process of forming ammonia (NH3) or nitrate (NO3-) from inorganic nitrogen in the atmosphere. Organisms are unable to consume molecular nitrogen directly. As a result, plants and organisms must consume nitrogen in stable compounds, for example nitrate ions (NO3-), ammonia (NH3) and urea (NH2)2CO. Bacteria are the only organisms capable of producing ammonia from nitrogen gas. Moran et al. (2012) reported that cyanobacteria performed half of the nitrogen fixation while the other half came from soil bacteria. Nitrogen fixation helps prevent overall nitrogen deficiency (Newton, 1999). Nitrogen fixation occurs... halfway through the article....... (2000). Living in the environment: Principles, connections, and solutions (11th ed.). Pacific Grove, CA: Brooks/Cole Publishing Company.Miller, G. T. (2007). Living in the environment: principles, connections and solutions (15th ed.). Pacific Grove, CA: Brooks/Cole Publishing Company.Moran, L.A., Horton, H.R., Scrimgeour, K.G., & Perry, M.D. (2012) Principles of Biochemistry (5th ed.). Glenview, IL: Pearson Education.Mordy, C.W., Eisner, L.B., Proctor, P., Stabeno, P., Devol, A.H., Shull, D.H., …Whitledge, T. (2010). Temporary decoupling of the marine nitrogen cycle: nitrite accumulation on the Bering Sea shelf. Marine Chemistry, 121, 157-166.Newton, W. E. (1999). Nitrogen fixation and the biosphere. In Martinez, E. & Hernandez, G. (Eds.), Highlights of nitrogen fixation research (pp. 1-8). New York, NY: Kluwer Academic/Plenum Publisher.