Effect of nitrogen source and tillage on N2O Emissions. Wagga Wagga, New South Wales, 2012-2013 [Theme 1: Inhibitors for reducing emissions]

This project aims to reduce nitrous oxide emissions from dryland grains cropping in northern and southern NSW through improving the nitrogen use efficiency of applied nitrogenous fertiliser, through the use of inhibitors, and through substituting fertiliser nitrogen with legume-derived nitrogen. Measurements of nitrous oxide will be field based, primarily using automated chambers at two key trial sites, but also using manual chambers at on-farm N-response trial sites conducted as part of the GRDC nitrogen-responses project.

Field results will be modelled to improve the capability of predicting nitrous oxide emissions from dryland cropping. Project outputs will contribute to the development of CFI methodologies for more efficient nitrogen fertiliser use in the grains industry.

本项目旨在通过提升施用氮肥的氮素利用效率、使用抑制剂以及用豆源氮替代肥料氮，减少新南威尔士州（New South Wales, NSW）北部与南部旱地谷物种植体系中的一氧化二氮（nitrous oxide）排放。一氧化二氮排放量的野外监测将以田间原位方式开展，主要在两个核心试验站点采用自动箱进行测量，同时也会在作为谷物研发与开发公司（Grains Research and Development Corporation, GRDC）氮响应项目组成部分的农场内氮响应试验站点使用手动箱完成监测。
研究人员将对田间试验结果进行建模，以提升旱地种植体系一氧化二氮排放量的预测能力。本项目成果将助力谷物行业高效施用氮肥的碳农业倡议（Carbon Farming Initiative, CFI）方法学体系开发。