Persistence of annual and perennial legumes 12 years after sowing in the Monaro region of New South Wales

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    Abstract

    The productivity of introduced and native-based pastures across the Monaro region of NSW is often constrained by low legume content. Full pasture renovation is frequently precluded by landscape, soil or economic constraints with producers often spreading legume seed with fertiliser in an attempt to increase legume content in pastures. Four methods of legume introduction into an existing pastures (surface broadcasting and direct drilling with and without a pre-sowing glyphosate knockdown) at two landscape positions (north and south facing aspect) for four legume species, subterranean clover (Trifolium subterraneum), Caucasian clover (T. ambiguum), Talish clover (T. tumens) and lucerne (Medicago sativa) were investigated. Direct drilling after a glyphosate knockdown was the most successful method of introduction with subterranean clover achieving the highest seedling density. However, after 12 years, few legumes could be found on the north-facing aspect and subterranean clover had not survived on the south facing aspect. Legumes were found only in the direct drilled-glyphosate knockdown treatment; lucerne having the highest plant density and herbage availability. Where legume treatments had failed, populations of tall speargrass (Austrostipa scabra), a native perennial grass, had returned to their original density. A. scabra density was significantly lower on the south facing aspect in the lucerne and Caucasian clover treatments. There is capacity to introduce legumes into existing pastures but seed-soil contact and reduction in competition from existing pasture species at establishment is crucial to long-term persistence
    Original languageEnglish
    Title of host publicationProceedings of the 2019 Australian Agronomy Conference, 25-29 August 2019, Wagga Wagga, Australia
    PublisherAustralian Society of Agronomy
    Pages1-4
    Number of pages4
    Publication statusPublished - 2019
    Event19th Australian Agronomy Conference 2019 - Wagga Wagga Civic Theatre, Wagga Wagga, Australia
    Duration: 25 Aug 201929 Aug 2019
    https://web.archive.org/web/20190122040437/http://agronomyconference.com/ (Conference website)
    https://web.archive.org/web/20190625230032/http://www.agronomyconference.com/program (Conference program)

    Conference

    Conference19th Australian Agronomy Conference 2019
    Abbreviated titleCells to Satellites
    Country/TerritoryAustralia
    CityWagga Wagga
    Period25/08/1929/08/19
    OtherThe 19th Australian Agronomy Conference will be held in Wagga Wagga, NSW from 25 – 29 August 2019. In the heart of the Riverina, Wagga Wagga has a range of rural industries across the region. Wagga has everything to offer the agronomy conference being surrounded by a mixed farming zone with irrigation to the west and permanent pasture enterprises to the east.
    The conference theme Cells to satellites highlights the integrative nature of agronomy. Each of us work across a range of disciplines to optimise crop or pasture production for productivity and profitability. We have an increasing number of tools available to increase the precision and accuracy of our work; whether it is at the “cellular” level where DNA is mapped and biochemistry is unravelled or using “satellites” for remote sensing or guidance. The opportunities for enhancing our agronomy research is boundless.
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