Nitrogen Cycles: Past, Present, and Future

@article{Galloway2004NitrogenCP,
  title={Nitrogen Cycles: Past, Present, and Future},
  author={James N. Galloway and Frank J. Dentener and Douglas G. Capone and Elizabeth W. Boyer and Robert W. Howarth and Sybil P. Seitzinger and Gregory P. Asner and Cory C. Cleveland and Pamela A. Green and Elisabeth Holland and David M. Karl and Anthony F. Michaels and John H. Porter and Alan R. Townsend and C. J. V{\"o}osmarty},
  journal={Biogeochemistry},
  year={2004},
  volume={70},
  pages={153-226}
}
This paper contrasts the natural and anthropogenic controls on the conversion of unreactive N2 to more reactive forms of nitrogen (Nr). A variety of data sets are used to construct global N budgets for 1860 and the early 1990s and to make projections for the global N budget in 2050. Regional N budgets for Asia, North America, and other major regions for the early 1990s, as well as the marine N budget, are presented to Highlight the dominant fluxes of nitrogen in each region. Important findings… 
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