Researcher(s) |
Ben Fleet Gurjeet Gill |
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Contact email | gurjeet.gill@adelaide.edu.au |
Contact phone | +61428592825 |
Year(s) | 2020 |
Contributor | School of Agriculture, Food and Wine - The University of Adelaide |
Trial location(s) |
Frances, SA
|
This field trial was undertaken Frances in SA, a high rainfall environment, to investigate factorial combinations of sowing time, cultivar, seed rate and herbicides on the management of annual ryegrass in triazine tolerant canola.
A field trial was undertaken in 2020 to investigate the effects of sowing time, canola variety, seed rate and herbicides on annual ryegrass management at a high rainfall site in South Australia (Frances). As expected, canola plant density was also significantly influenced by the seed rate (P<0.001). The lower seed rate had 26 plants/m2 as compared 52 plants/m2 in the higher seed rate. Therefore, crop seed rates selected were able to achieve the target crop density. Delayed sowing did not have any effect on in-crop ryegrass density (P=0.355). Application of pre- and post-emergent herbicide treatments resulted in a significant reduction in ARG plant density. However, there were no differences in ARG plant density between the herbicide treatments. These trends were also reflected in ARG spike density. The large amount of spikes produced by ARG in all the treatments indicates high tiller production by the plants that survived herbicide treatments as well as later emergence of ARG at this site. ARG spike production, which is the main determinant of its seed production, was significantly affected by canola variety (P=0.007). Hybrid variety Hyola 650TT was able to reduce ARG spike density by almost 50% compared to open-pollinated Wahoo. As seen with ARG spike density, canola variety had a significant effect on ARG seed set. Hybrid canola Hyola 650TT reduced ARG seed set by 73% as compared to the open-pollinated Wahoo (P=0.017). Herbicide treatments also had a significant effect (P=0.014) on ARG seed set. The treatment where Select + Factor + Atrazine were used post-emergent was the best performer with significantly lower ARG seed set than the other three treatments. Addition of Factor (butroxydim) has been shown to significantly improve control of clethodim resistant ARG populations. Canola variety selection also had a significant effect on grain yield (P<0.001). Hyola 650TT produced significantly higher grain yield than the open-pollinated Wahoo. These results clearly highlight the benefits of good early vigour of the hybrid variety for grain yield and weed suppression in this high rainfall environment.
Lead research organisation |
School of Agriculture, Food and Wine - The University of Adelaide |
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Host research organisation |
MacKillop Farm Management Group |
Trial funding source | GRDC 9175134 |
Related program |
GRDC Crop Protection - Weeds |
Acknowledgments |
GRDC for providing funding for the project and the local grower for providing land for the trial. |
Other trial partners | SARDI, Struan |
Crop types | Weed: Ryegrass Oilseed: Canola |
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Treatment type(s) |
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Trial type | |
Trial design |
Sow date | Not specified |
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Harvest date | Not specified |
Plot size | Not specified |
Plot replication | Not specified |
Psuedoreplication | Not specified |
Sow date | 4 May and 25 May |
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Harvest date | Not applicable |
Plot size | Not specified |
Plot replication | Not specified |
Psuedoreplication | Not specified |
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.