Grains Research and Development

GRDC Update Papers

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This page contains papers from the GRDC Update series for both growers and advisers.

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  • Denitrification and managing nitrogen loss risk - key factors affecting loss

    Research Updates

    Grains

    Article Date
    10.03.2017
    GRDC Project Code
    DAQ00183
    Presented At
    Presented at the Bellata GRDC Grains Research Update March 2017 by Chris Dowling
    Region
    North

    Denitrification N loss is an unavoidable soil process during crop production in the north. Understanding the key drivers and finding practical N management options in high risk situations or following a significant N loss event is the key to ensuring the economic impact of a denitrification event is minimised.

  • High crown rot risk and should growers plant barley or wheat in northern NSW and southern Queensland

    Research Updates

    Grains

    Article Date
    09.03.2017
    GRDC Project Code
    DAN00175, DAN00167
    Presented At
    Presented at the Condamine GRDC Grains Research Update March 2017 by Steve Simpfendorfer
    Region
    North

    • In 62% of trial comparisons the barley variety Commander provided a significant yield benefit (av. 1.04 t/ha) over the bread wheat variety EGA Gregory when grow in the presence of crown rot infection.
    • In 30% of trial comparisons the effect of choosing Commander or EGA Gregory was neutral in the presence of crown rot infection.
    • In 8% of trial comparisons Commander resulted in a significant yield penalty (av. 0.48 t/ha) compared to growing EGA Gregory , likely due to stress occurring earlier in the season.
    • Barley and bread wheat varieties do vary in yield response in the presence of crown rot infection.
    • Barley is very susceptible to crown rot infection and will not reduce inoculum levels for subsequent cereal crops.

  • Crown rot yield loss response curves

    Research Updates

    Grains

    Article Date
    09.03.2017
    GRDC Project Code
    DAW00245
    Presented At
    Presented at the Condamine GRDC Grains Research Update March 2017 by Steve Simpfendorfer
    Region
    North

    • Response curves provide an additional tool to aid growers in varietal selection decisions to maximise returns in the presence of disease.
    • An experiment conducted near Macalister in 2015 revealed variation in the yield response of varieties to crown rot, along with their resistance to this disease.
    • The variety Suntop, although displaying crown rot symptoms similar to that of a susceptible variety, demonstrated a greater ability to maintain yield in the presence of disease than other varieties considered (tolerance).
    • The selection of varieties based purely on current resistance categories may be overlooking genetics with improved tolerance, such as the variety Suntop.

  • Variety specific agronomy package research program

    Research Updates

    Grains

    Article Date
    09.03.2017
    GRDC Project Code
    DAN00167
    Presented At
    Presented at the Condamine GRDC Grains Research Update March 2017 by Andrew Erbacher
    Region
    North

    • Targeting planting date and varieties to flower in an optimum window will maximise yield. Heat stress is more likely than frost at flowering on the Western Downs.
    • Plant populations greater than 80 plants/m2 established, have maximised yield in these trails. There is no yield penalty for exceeding this population.
    • Upfront nitrogen fertiliser application for average yield potential will be most effective in most seasons. In seasons with a wet spring, an in crop application of nitrogen will allow for the additional yield potential of the crop with the added advantage of a small protein benefit.

  • Yellow leaf spot trials and the economics of spraying

    Research Updates

    Grains

    Article Date
    09.03.2017
    GRDC Project Code
    DAW00245
    Presented At
    Presented at the Condamine GRDC Grains Research Updates March 2017 by Ryan Fowler.
    Region
    North

    • Crop rotation and reducing surface stubble decrease inoculum levels
    • Do not sow susceptible wheat varieties into wheat stubble
    • Economic response to fungicide application is a factor of varietal susceptibility, severity of the epidemic, product choice and timing of application.
    • Increasing moisture periods increase the incidence and severity of yellow spot

  • Managing weeds in fencelines

    Research Updates

    Grains

    Article Date
    07.03.2017
    GRDC Project Code
    UA00124
    Presented At
    Presented at the Dubbo and Goondiwindi GRDC Grains Research Updates February and March 2017 by Chris Preston
    Region
    North

    • Persistent use of glyphosate in fencelines and crop margins will lead to glyphosate resistant weeds that can then invade the cropped area of the paddock.
    • A range of non-chemical options are available, that may suit some growers.
    • A combination of an alternative knock down herbicides with bromacil has proved effective in managing glyphosate resistant annual ryegrass in fencelines.
    • Applying residual herbicides to bare ground is an alternative herbicide option to using glyphosate.

  • A simple visual lodging risk guide to assist with decision making on Plant Growth Regulators

    Research Updates

    Grains

    Article Date
    07.03.2017
    GRDC Project Code
    CSA00039
    Presented At
    Presented at the Goondiwindi GRDC Grains Research Update March 2017 by Nick Poole
    Region
    North

    • Irrigation increases crop canopy biomass and supports higher yield potential; both however put greater stress on stem strength and the anchorage of the plant in the soil, leading to increased risk of lodging.
    • Two of the biggest determinants of lodging (other than weather conditions during grain fill) in irrigated wheat crops are the cultivar lodging resistance rating and the inherent fertility (N supply) of the paddock.
    • Background N supply to the crop can be “visualised” and quantified with reference to NDVI readouts or canopy photos comparing N deficient or N Rich strips to the remainder of the paddock.
    • PGR input and N management at stem elongation represent the last opportunity to reduce lodging risk with management matched to lodging as defined by the visual appearance of the crop and knowledge of cultivar standing power under irrigation.
    • These recommendations were generated from experiments and farm monitoring on vertosol soil types in the ‘old’ northern region (Northern NSW and QLD), and caution should be taken applying them outside of these districts.

  • Plant growth regulators in barley 2015 and 2016

    Research Updates

    Grains

    Article Date
    07.03.2017
    GRDC Project Code
    NGA0004
    Presented At
    Presented at the Goondiwindi GRDC Grains Research Update March 2017 by Richard Daniel
    Region
    North

    • Plant growth regulators (PGRs) have shown inconsistent results in terms of crop responses and lodging reduction.
    • Mixing partners with Moddus® Evo showed no advantage over the use of Moddus Evo alone.
    • In a wet, favourable year, the use of PGRs can aid in reducing the incidence and severity of lodging in susceptible barley varieties and have positive effect on yield however, multiple applications may be required.
    • PGRs can have substantial impact on crop height; however, the response in terms of crop yield can be variable.

  • Nitrogen management in wheat 2016 - method, timing and variety

    Research Updates

    Grains

    Article Date
    07.03.2017
    GRDC Project Code
    NGA00004
    Presented At
    Presented at the Goondiwindi, Bellata and Condamine Grains Research Updates March 2017 by NGA
    Region
    North

    1. The rate of nitrogen applied was the main factor impacting yield and grain quality in all trials.
    2. Urea spread with no physical incorporation, provided equivalent crop responses to urea spread and incorporated.
    3. There was no consistent impact from N application timing.

  • Canola agronomy and fit in northern farming systems

    Research Updates

    Grains

    Article Date
    07.03.2017
    GRDC Project Code
    CSP00187
    Presented At
    Presented at the Goondiwindi and Bellata GRDC Grains Research Updates March 2017 by Jeremy Whish

    • Identifying the optimal flowering window is an important consideration when growing canola in northern environments
    • It is important to consider both biotic and abiotic stresses when identifying the optimal window
    • Short to mid-season varieties are most suited to northern environments
    • A large proportion of the final yield comes from the branches and should be considered when deciding to desiccate or windrow.