Rapid Detection Of Frost Damage In Wheat Using Remote Sensing

GRDC - James G. Nuttall (Agriculture Victoria, Horsham, Victoria), Eileen M. Perry (Agriculture Victoria, Epsom, Victoria and The University of Melbourne, Parkville, Victoria), Audrey J. Delahunty (Agriculture Victoria, Horsham, Victoria and The University of Melbourne, Parkville, Victoria), Alexander B. Clancy (Agriculture Victoria, Horsham, Victoria), Garry J. O’Leary (Agriculture Victoria, Horsham, Victoria), Glenn J. Fitzgerald (Agriculture Victoria, Horsham, Victoria and Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Creswick, Victoria) and Ashley J. Wallace (Agriculture Victoria, Horsham, Victoria).

Type: Research Paper
Knowledge level: Advanced

Farm Table says:

The authors of this paper note in the conclusion: "For wheat, where frost treatments were applied at flowering, grain number and yield were reduced by 8.8 and 7.2%, respectively, for every degree Celsius below zero (down to -4°C). This effect was additive over two consecutive nights. In terms of cold load, there was a 2.2 and 1.9% reduction in grain number and yield, respectively per °C.hr (below 0°C). The remote sensing spectral indices; PRI, NDVI and NDRE showed significant relationships with cold load and wheat yield over four of the six paddocks surveyed and represent an opportunity for spatial management of crops when considering hay versus grain production. Further investigation over multiple years, sites and crop growth stages is required to verify the stability and utility of these indices. Finally, the need for ground scouting to validate sensor derived information ahead of making a tactical management decision remains essential." Please access the full paper via the link below if this research interests you.

The take home messages from this GRDC funded research are below. Please access the full paper via the link below for methodology, references, acknowledgements and discussion.

Take home messages from the paper include:

  • Applying a single frost to wheat at flowering reduced yield by 7% for every degree below zero (up to -4°C), however, this increased to a reduction by 12% for every degree below zero when applied over two consecutive nights (up to -3°C).
  • Remote sensing spectral indices including normalised difference vegetation index (NDVI), normalised difference red edge (NDRE) and photochemical response index (PRI) showed significant relationships with cold load applied to wheat, however, to date no universal index for frost damage using remote sensing has been identified.
  • Similar utility of these three spectral indices were observed for a survey of six commercial wheat paddocks in 2018 near Murtoa, Victoria, suggesting an opportunity for spatial management of crops when considering hay versus grain production.

2020 - Australia - GRDC - James G. Nuttall (Agriculture Victoria, Horsham, Victoria), Eileen M. Perry (Agriculture Victoria, Epsom, Victoria and The University of Melbourne, Parkville, Victoria), Audrey J. Delahunty (Agriculture Victoria, Horsham, Victoria and The University of Melbourne, Parkville, Victoria), Alexander B. Clancy (Agriculture Victoria, Horsham, Victoria), Garry J. O’Leary (Agriculture Victoria, Horsham, Victoria), Glenn J. Fitzgerald (Agriculture Victoria, Horsham, Victoria and Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Creswick, Victoria) and Ashley J. Wallace (Agriculture Victoria, Horsham, Victoria).
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