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| Researcher(s) |
Rohan Brill John Bromfield Rajneet Kaur Uppal |
|---|---|
| Year(s) | 2017 |
| Contributor | Department of Primary Industries NSW |
| Trial location(s) |
Wagga Wagga, ACT
|
| Further information | View external link |
The aim of this experiment was to test a novel method of imposing heat stress in the field and determine the effect of heat stress on canola grain yield and its interaction with water availability
• A preliminary experiment in 2017 showed that extra heat can be applied to canola plots successfully using specially designed heat chambers.
• Heat stress of four days, applied seven days after flowering started, significantly reduced the grain yield of the flowers opening during that period.
• Four days of heat stress significantly reduced harvest index and thousand seed weight at the plot level, however, grain yield and biomass yield was not affected due to recovery during cooler nights.
• Further research is needed to extend the duration and intensity of heat stress to show differences, and for rigorous validation across different varieties.
A randomised complete block design with two heat treatments (control vs heat stress 31 °C), seven timings of heat stress (start of flowering until end of flowering), two water regimes (wet vs dry) and three replications was used.
| Lead research organisation |
Department of Primary Industries NSW |
|---|---|
| Host research organisation | N/A |
| Trial funding source | GRDC |
| Trial funding source | DPI NSW |
| Related program | N/A |
| Acknowledgments |
This research was a joint investment by NSW DPI and GRDC Grains Agronomy and Pathology Partnership (GAPP) program. Thanks to technical support from Warren Bartlett, Danielle Malcolm and Sophie Prentice. |
| Other trial partners | Not specified |
| Crop type | Oilseed: Canola |
|---|---|
| Treatment type(s) |
|
| Trial type | Experimental |
| Trial design | Replicated |
| Sow date | 4 May 2017 |
|---|---|
| Harvest date | 9 November 2017 |
| Plot size | Not specified |
| Plot replication | 3 |
| Fertiliser |
soil nitrogen 75 kg/ha at the time of sowing |
| Other trial notes |
This research paper is an extract from the publication Southern NSW Research Results 2018, available at |
| # |
Treatment 1
|
Grain yield (g) |
|---|---|---|
| 1 | █ Heat stress 7 DAF | 0.063 |
| 2 | █ Control | 0.187 |
| 3 | █ Heat stress 14 DAP | 0.867 |
| 4 | █ Control | 1.164 |
| 5 | █ Heat stress 21 DAF | 0.744 |
| 6 | █ Control | 1.025 |
| 7 | █ Heat stress 28 DAF | 1.192 |
| 8 | █ Control | 1.793 |
SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol 16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.
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Note that PBR cover is administered through the Plant Breeders’ Right Act 1994 (