Nutrition decisions following a dry season

Graeme A. Sandral, Ehsan Tavakkoli, Rohan Brill, Felicity Harris, Russell Pumpa, Maryam Barati, Eric Koetz, John Angus

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


    Fertiliser savings after drought or failed crop are possible with phosphorus (P) where there has been an extensive P fertiliser history and Colwell P values are at or above crop critical requirements. As a guide, one third of average crop P replacement can be applied down to a base level of 3-4kg P/ha.
    Savings in nitrogen (N) are likely to be less substantial than savings in P. Nitrogen savings are likely a result of higher spared N (mineral N carryover from last season), lower immobilisation due to lower crop residues and higher mineralisation rates assuming adequate late summer and early autumn rains.
    To better assess spared and mineralised N, deep soil cores should be taken to 60cm and split at 30cm to determine the amount and timing of mineral N availability.
    Original languageEnglish
    Title of host publicationGRDC update papers
    Place of PublicationAustralia
    PublisherGrains Research and Development Corporation
    Publication statusPublished - 19 Feb 2019
    EventGRDC Grains Research Update (Wagga Wagga) - Joyes Hall, Charles Sturt University, Wagga Wagga, Australia
    Duration: 19 Feb 201920 Feb 2019 (Conference website) (Proceedings link)


    ConferenceGRDC Grains Research Update (Wagga Wagga)
    Abbreviated titleBoosting Profitability - Resilient Solutions
    CityWagga Wagga
    OtherThe GRDC Grains Research Update events are for agronomists, consultants, researchers and growers to see and discuss the latest in research and to network with their peers about how to apply new and relevant information to the latest farming systems.
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