Effect of combinations of sowing time, seed rate and herbicides on ryegrass management in canola

2020
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) Frances, SA
Effect of combinations of sowing time, seed rate and herbicides on ryegrass management in canola locations
Aims

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.

Key messages

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
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
Download the trial report to view additional trial information

Method

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

Frances 2020 Ryegrass

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

Frances 2020 Canola

Sow date 4 May and 25 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
Frances, SA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Frances, SA Sodosol
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

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Climate

Derived climate information

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

Frances SA

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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 16:14pm AEST