DMPP reduced nitrous oxide emissions, but did not improve grain yield

Guangdi D. Li, Adam J. Lowrie, Richard J. Lowrie, Graeme D. Schwenke, Richard C. Hayes, Hongtao Xing

    Research output: Book chapter/Published conference paperConference paperpeer-review

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    Nitrogen inhibitors have been used to reduce nitrous oxide (N2O) emission and increase nitrogen use efficiency in many agricultural systems. However, its agronomic benefits, such as the improvement of grain yield, is uncertain. A four-year experiment with a wheat–canola–pulse–wheat crop sequence was established at Wagga Wagga, NSW in 2012. Nitrification inhibitor (3,4-dimethylpyrazole phosphate, DMPP) and urease inhibitor [N-(n-butyl) thiophosphoric triamide, NBPT] were applied as coated urea products (ENTEC and Green Urea, respectively) to wheat and canola crops over two growing seasons in 2012 and 2013. The objectives were a) to investigate whether the use of ENTEC and Green Urea can reduce N2O emissions and increase grain yield; and b) to conduct a gross margin analysis to assess the economic benefit by using ENTEC and Green Urea. Results showed that DMPP reduced N2O emission by 34% on the wheat crop in 2012 and 62% on the canola crop in 2013. There were no yield benefits from either ENTEC or Green Urea in any season. As a result, there was no economic benefit to use N inhibitors in dryland cropping system in southern NSW due to their higher input cost.
    Original languageEnglish
    Title of host publicationProceedings of the 18th Australian agronomy conference Ballarat, Victoria 24-28 September, 2017
    Place of PublicationAustralia
    PublisherAustralian Society of Agronomy
    Number of pages4
    Publication statusPublished - 2017
    Event18th Australian Agronomy Conference 2017 - Mercure Ballarat Hotel & Convention Centre, Ballarat, Australia
    Duration: 24 Sept 201728 Sept 2017 (Conference website) (Conference proceedings)


    Conference18th Australian Agronomy Conference 2017
    Abbreviated titleDoing more with less
    OtherThe 18th Australian Agronomy Conference will be held at the Mercure Ballarat Hotel and Convention Centre, Victoria from 24-28 September 2017. The Australian Agronomy Conference is the meeting place for Agronomists; it supports research and the community of Agronomists by connecting Agronomy communities across Australia to each other.

    The theme for the 2017 conference is “Doing more with less”. A central plank of Australia’s productive output is agriculture, worth over AUD$13.6 billion exported annually. Agronomy is key to ensuring that farmland is productive across Australia’s diverse landscapes. Innovation in machinery and precision technologies, plant species and varieties, soil and plant management may allow the agronomist of today to successfully help agricultural producers thrive. These innovations are timely as the world deals with increasingly variable climates, environmental degradation, and a more developed global community that requires more diverse products from agriculture.
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