Nitrogen cycling in rice paddy environments: Past achievements and future challenges

Satoshi Ishii, Seishi Ikeda, Kiwamu Minamisawa, Keishi Senoo

Research output: Contribution to journalReview articlepeer-review

175 Scopus citations


Nitrogen is generally the most limiting nutrient for rice production. In rice paddy soils, various biochemical processes can occur regarding N cycling, including nitrification, denitrification, and nitrogen fixation. Since its discovery in the 1930s, the nitrification-denitrification process has been extensively studied in Japan. It may cause N loss from rice paddy soils, while it can also reduce environmental pollutions such as nitrate leaching and emission of nitrous oxide (N 2O). In this review article, we first summarize the early and important findings regarding nitrification-denitrification in rice paddy soils, and then update recent findings regarding key players in denitrification and N 2O reduction. In addition, we also discuss the potential occurrence of other newly found reactions in the N cycle, such as archaeal ammonia oxidization, fungal denitrification, anaerobic methane oxidation coupled with denitrification, and anaerobic ammonium oxidation.

Original languageEnglish (US)
Pages (from-to)282-292
Number of pages11
JournalMicrobes and environments
Issue number4
StatePublished - 2011
Externally publishedYes


  • Denitrification
  • Nitrification
  • Nitrogen cycling
  • Nitrogen fixation
  • Rice paddy soil


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