Mitigation of N2O emission from agricultural soil and estimate of N2O production processes

2022 Fiscal Year Final Research Report

• Project/Area Number: 18H02318
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 41050:Environmental agriculture-related
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: Akiyama Hiroko 国立研究開発法人農業・食品産業技術総合研究機構, 農業環境研究部門, グループ長 (00354001)
• Project Period (FY): 2018-04-01 – 2023-03-31
• Keywords: 一酸化二窒素 / 土壌

Outline of Final Research Achievements

We measured N2O emissions from an Andosol field for three years using an automated flux monitoring system. The annual N2O emission was significantly lower in the nitrification inhibitor treatment than in the urea treatment, due to low N2O emission after fertilizer application. Cabbage yield was not significantly different. Therefore, the both N2O emission per area and per yield were lower in the nitrification inhibitor treatment than in the urea treatment. In addition, nitrification was inhibited by nitrification inhibitors. Our results showed that nitrification inhibitor can reduce N2O emissions and reduce the labor cost of additional fertilizer application while maintaining the yield.

Free Research Field

環境農学

Academic Significance and Societal Importance of the Research Achievements

一酸化二窒素（N2O）は強力な温室効果ガスであるとともにオゾン層破壊物質でもある。農業はN2Oの最大の人為的排出源であり、農耕地におけるN2Oの発生削減技術の開発は急務である。N2Oの発生経路は主に微生物による硝化および脱窒（細菌脱窒、硝化菌脱窒、糸状菌脱窒）である。
本課題では、硝化抑制剤は肥料由来N2O発生量を削減するとともに収量を維持しながら追肥の労力を削減できることが明らかにした。本研究成果は農耕地から発生する温室効果ガス削減に貢献するものである。