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Nitrous oxide [亜酸化窒素]

posted Mar 20, 2013, 10:03 PM by Yoshitaka Uchida Hokudai   [ updated May 15, 2013, 6:07 PM ]
In our lab, 'N2O' or nitrous oxide can be one of the most important key words. N2O is a greenhouse gas produced from soils. Because N2O is a greenhouse gas, its emissions from soils have to be stopped or reduced, but it is difficult. 

Why? One reason is because the most important source of N2O is a use of synthetic fertilizer (chemical fertilizer). In modern agriculture, it is hard to tell farmers to 'reduce' the use of synthetic fertilizer because farmers have to use fertilizer to maintain high yield. 

Not only fertilizers but animal urine is another important source of N2O. In a country like New Zealand, N2O emissions from cow & sheep urine are one of the largest sources of N2O. 

Our team are trying to propose farm management options to reduce N2O, without reducing farm yield. In fact, reducing N2O and increasing farm yield can be similar because both are trying to reduce the loss of nutrients from soils. 

Here are some of the ideas researched by scientists to reduce N2O emissions without reducing fertilizer inputs. 
  • Improve soil structure (high N2O emissions are often observed from poorly managed soils)
  • Timing of fertilizer application (apply fertilizers when plants need them)
  • Use of coated fertilizers
  • Use of microbial inoculations to reduce N2O
These are known to reduce N2O emissions but the reduction efficiency differs by different soil types/climate conditions. More and more studies are needed to efficiently reduce greenhouse gas emissions from soils.



  • 土壌環境を整える(土壌の構造が悪いとN2Oがたくさん出ることがわかっています)。
  • 肥料をあげるタイミング(植物が必要としているときに肥料をあげる)。
  • 被服肥料などを用いる。
  • 微生物を用いてN2Oを削減する。