Effect of sowing time x seed rate x herbicides on brome grass management in canola

CC BY 4.0

Research organisatons
Funding source

Trial details

Researcher(s) Ben Fleet
Gurjeet Gill
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
Effect of sowing time x seed rate x herbicides on brome grass management in canola locations

To investigate the effects of variety selection, time of sowing, plant density and herbicide strategies on brome grass competition with canola.

Key messages

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
Host research organisation Birchip Cropping Group
Trial funding source GRDC 9175134
Related program GRDC - Weeds

GRDC for funding the project and the local grower for providing land for the trial.

Other trial partners Not specified
Download the trial report to view additional trial information


Crop types Weed: Brome grass Oilseed: Canola
Treatment type(s)
  • Herbicide: Type
  • Sowing: Rate
  • Sowing: Timing
Trial type
Trial design

Whirily, Victoria 2020 Brome grass

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified

Whirily, Victoria 2020 Canola

Sow date 17 April and 15 May
Harvest date Not applicable
Plot size Not specified
Plot replication Not specified
Download the trial report to view additional method/treatment information
Trial source data and summary not available
Check the trial report PDF for trial results.
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Whirily, Victoria, VIC Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Whirily, Victoria, VIC Vertosol
National soil grid Source: CSIRO/TERN
NOTE: National Soil Grid data is aggregated information for background information on the wider area
Actual soil values can vary significantly in a small area and the trial soil tests are the most relevant data where available

Soil properties



Derived climate information

No observed climate data available for this trial.
Derived climate data is determined from trial site location and national weather sources.

Whirily, Victoria VIC

NOTE: Exact trial site locality unknown - Climate data may not be accurate

Some data on this site is sourced from the Bureau of Meteorology

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.

Trial report and links

2020 trial report

Trial last modified: 20-03-2023 16:38pm AEST