Effect of sowing time, cultivar, seed rate and herbicides on brome grass management in canola (Mallala, SA)

2018
CC BY 4.0

Research organisaton
Funding source

Trial details

Researcher(s) Ben Fleet
Gurjeet Gill
Year(s) 2018
Contributor School of Agriculture, Food and Wine - The University of Adelaide
Trial location(s) Mallala, SA
Effect of sowing time, cultivar, seed rate and herbicides on brome grass management in canola (Mallala, SA) locations
Aims

To investigate the effects of combinations of canola sowing time, variety, seed rate and herbicides on brome grass management.

Key messages

The trial site at Mallala was infested with a large seedbank of group A resistant brome grass, which made weed control in canola very difficult. Furthermore, the trial site experienced drought like conditions for most of the growing season which reduced the efficacy of atrazine. Even though the two-week delay in sowing reduced brome grass density from 927 plants/m2 in TOS 1 to 704 plants/m2 in TOS 2 (25%), this difference was not statistically significant.  However, the herbicide treatments (P=0.005) and the interaction between sowing date and herbicides (P=0.006) had a significant effect on brome grass plant density. Herbicide performance at the site was negatively affected by dry conditions and group A resistance in brome grass. As a result, even the best treatment combinations had more than 300 panicles/m2, which could lead to a large seed set in brome grass. When averaged across the sowing time, seed rate and herbicides, HyTTec Trophy produced 38% higher grain yield than Bonito. This difference in variety performance is consistent with superior crop establishment in HyTTec Trophy than Bonito. As a result of herbicide resistance in brome grass, yield increase in the Verdict treatment compared to the control (atrazine POST) was non-significant. However, use of clethodim increased yield by 61% compared to the control, which was statistically significant.

Lead research organisation School of Agriculture, Food and Wine - The University of Adelaide
Host research organisation School of Agriculture, Food and Wine - The University of Adelaide
Trial funding source GRDC 9175134
Related program GRDC - Weeds
Acknowledgments

GRDC for providing funds for this research and SARDI (Clare) for sowing the trial.


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

Method

Crop types Oilseed: Canola Weed: Brome grass
Treatment type(s)
  • Crop: Variety
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Mallala 2018 Canola

Sow date TOS 1: 14 May, 2018; TOS 2: 1 June, 2018
Harvest date Unknown
Plot size Not specified
Plot replication Not specified

Mallala 2018 Brome grass

Sow date Not specified
Harvest date Not specified
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
Mallala, SA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Mallala, SA Calcarosol
Soil Moisture Source: BOM/ANU
Average amount of water stored in the soil profile during the year, estimated by the OzWALD model-data fusion system.
Year Mallala SA
2018 450.0mm
2017 523.0mm
2016 461.1mm
2015 442.5mm
2014 500.4mm
2013 481.1mm
2012 497.5mm
2011 533.7mm
2010 495.1mm
2009 452.9mm
2008 455.9mm
2007 506.8mm
2006 518.9mm
2005 531.9mm
2004 499.7mm
2003 497.3mm
2002 474.8mm
2001 527.0mm
2000 518.3mm
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.

Mallala 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 last modified: 03-01-2023 14:58pm AEST