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    Gibberellic acid and grazing in oats

    Jessica Lemon1, Ashley Wallace2, Genevieve Clarke2 VIC OUYEN MALLEE Transparent LIGHT

    1Birchip Cropping Group; 2Agriculture Victoria

    Funding: DAV00143

    Peer review: Alison Frischke (BCG) and Tim McClelland (Model Agronomics)

    Key Words: giberillic acid, grazing cereals, oats, growth regulators

    Key messages

    • Current knowledge of the effects of gibberellic acid application to oats is limited.
    • In 2016 GA had no impact on biomass or feed quality of oats.
    • Exceptional growing conditions and a mild winter may have reduced effects of GA.

    Background

    This research was conducted to give growers a better understanding of the effects of gibberellic acid (GA) on oats in terms of changes to production, plant recovery for hay and grain yields and likely economics.

    Aim

    To measure the biomass production response and feed quality of oats under different timings of gibberellic acid application and grazing.

    Method

    A replicated field trial was sown into clay loam soils at Warmur (near Birchip) using a randomised block design. Assessments included establishment counts, crop biomass and feed quality measurements taken at several timings, lodging scores, grain quality and yield parameters.

    GA was applied as Gala GA @ 80ml/ha. Grazing was simulated using a whipper snipper, cutting crop to a height of 10cm on 21 July.

    Table 1. Treatment outline

    Treatment
    GA timing in relation to grazing event
    Gala GA application
    Grazed 21 July
    1 Nil – –
    2 Nil – ✓
    3 Before 15 June ✓
    4 After 29 July ✓
    5 Before 15 June –
    6 After 29 July –

    Acknowledgments

    This research was funded by the GRDC as part of the Grain & Graze 3 project, BCG members through their membership and Improving practices and adoption through strengthening D & E Capability and delivery in the southern region (RRA)- DAV00143 GRDC DEDJTR Bilateral Research Agreement.

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