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) |
Whirily, Victoria, VIC
|
To investigate the effects of variety selection, time of sowing, plant density and herbicide strategies on brome grass competition with canola.
Canola establishment was significantly influenced by the variety (P=0.012) and seed rate (P<0.001). Greater plant density in the hybrid variety T4510 (36 plants/m2) than the open pollinated Bonito (31 plants/m2) is likely to be associated with the larger seed size and greater early vigour in the hybrid. Plant density achieved was within 10% of the target density. There was a significant interaction between sowing time of canola and herbicide treatments (P=0.004). This interaction was mainly associated with a significantly lower brome grass density in the control (glyphosate). In contrast, brome grass density was very similar between the two sowing dates where pre-emergent and post-emergent herbicides were used. Consistent with the trend of brome grass panicle density, brome grass seed production in this trial was significantly influenced by the herbicide treatment (P<0.001). The results also show that brome grass panicles set more seeds when only the knockdown or Atrazine IBS was used (49-59 seeds/panicle) as compared to post-emergence Haloxyfop treatments (30 seeds/panicle). Canola grain yield was significantly affected by the time of sowing (P=0.034), with the earlier sown crop (1.58 t/ha) producing higher yield than the later sowing (1.35 t/ha). The hybrid variety Invigor T4510 (1.56 t/ha) produced significantly higher grain yield than the open-pollinated Bonito (1.37 t/ha) (P<0.001). Increase in canola plant density from 25 to 50 plants/m2 also caused a significant increase in grain yield (P=0.002), even though the yield improvement was only 100 kg/ha. Even though brome grass density at the site was fairly low (~12 plants/m2), herbicide treatments had a significant positive effect on canola grain yield (P<0.001). Controlling brome increased income by $169/ha or 21% after including the cost of the herbicides and applying the herbicides when averaged across the trial.
Lead research organisation |
School of Agriculture, Food and Wine - The University of Adelaide |
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Host research organisation |
Birchip Cropping Group |
Trial funding source | GRDC 9175134 |
Related program |
GRDC - Weeds |
Acknowledgments |
GRDC for funding the project and the local grower for providing land for the trial. |
Other trial partners | Not specified |
Crop types | Weed: Brome grass 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 | 17 April and 15 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.