Nutrition decisions following a dry season

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

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

Abstract

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 publicationGrains research update
Subtitle of host publicationBoosting profitability - resilient solutions
PublisherGrains Research and Development Corporation
Pages49
Publication statusPublished - 19 Feb 2019
EventGRDC Grains Research Update - Charles Sturt University, Wagga Wagga, Australia
Duration: 19 Feb 201920 Feb 2019
https://grdc.com.au/resources-and-publications/grdc-update-papers/tab-content/past-update-proceedings/2019/grdc-grains-research-update-wagga-wagga-2019?result_296215_result_page=2
https://grdc.com.au/__data/assets/pdf_file/0032/375746/_Wagga-update-proceedings-2019-Interactive.pdf (program)

Publication series

NameGRDC Grains Research Update
PublisherGRDC

Conference

ConferenceGRDC Grains Research Update
CountryAustralia
CityWagga Wagga
Period19/02/1920/02/19
Internet address

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