The interaction between seeding rate and row spacing of hybrid and open pollinated canola (Brassica napus) varieties on annual ryegrass (Lolium rigidum) growth and seed production.

2019

Research organisatons
Funding source

Trial details

Researcher(s) Mike Ashworth
Contact email mike.ashworth@uwa.edu.au
Year(s) 2019
Contributor School of Agriculture and Environment - The University of Western Australia
Trial location(s) Kojonup, WA
The interaction between seeding rate and row spacing of hybrid and open pollinated canola (Brassica napus) varieties on annual ryegrass (Lolium rigidum) growth and seed production. locations
Aims

The trials located at Miling and Kojonup in the grainbelt of Western Australia investigated combinations of canola variety (hybrid or open pollinated), crop row spacing (25 or 50cm) and canola seeding rate (20, 35 or 50 plants/m2). The average seedbank at the Miling and Kojonup sites were 3,630 seeds/m2 and 23,240 seeds/m2 respectively.  Annual ryegrass (ARG) establishment was reduced in hybrid canola treatments seeded at narrower 25 cm row spacing. Decreasing crop row spacing (from 50 to 25cm) and increasing canola seeding rate (from 20 to 50 plants/m2) was found to reduce ARG establishment in the absence of herbicides. At the Kojonup site, ARG seed production was reduced by hybrid varieties (Trophy) and higher plant densities (50 plants/m2). However due to the low rainfall at the Miling site, no interactions were identified. Canola yield in this study was increased in hybrid variety (Trophy) treatments especially at higher seeding rates (50 plants/m2). Interestingly, however, canola seeded at the wider row spacing (50cm) consistently out yielded the corresponding variety and seeding rate combination at the narrower 25cm row spacing. This study conducted two trials in 2018 (Mingenew and Cunderdin) and 2019 (Miling and Kojonup). Multi- environment trial analysis for the combined 2018 and 2019 data to be completed.

Key messages

The trials located at Miling and Kojonup in the grainbelt of Western Australia investigated combinations of canola variety (hybrid or open pollinated), crop row spacing (25 or 50cm) and canola seeding rate (20, 35 or 50 plants/m2). The average seedbank at the Miling and Kojonup sites were 3,630 seeds/m2 and 23,240 seeds/m2 respectively.  Annual ryegrass (ARG) establishment was reduced in hybrid canola treatments seeded at narrower 25 cm row spacing. Decreasing crop row spacing (from 50 to 25cm) and increasing canola seeding rate (from 20 to 50 plants/m2) was found to reduce ARG establishment in the absence of herbicides. At the Kojonup site, ARG seed production was reduced by hybrid varieties (Trophy) and higher plant densities (50 plants/m2). However due to the low rainfall at the Miling site, no interactions were identified. Canola yield in this study was increased in hybrid variety (Trophy) treatments especially at higher seeding rates (50 plants/m2). Interestingly, however, canola seeded at the wider row spacing (50cm) consistently out yielded the corresponding variety and seeding rate combination at the narrower 25cm row spacing. This study conducted two trials in 2018 (Mingenew and Cunderdin) and 2019 (Miling and Kojonup). Multi- environment trial analysis for the combined 2018 and 2019 data to be completed.

Lead research organisation Australian Herbicide Resistance Initiative
Host research organisation N/A
Trial funding source GRDC 9175134
Related program N/A
Acknowledgments

This research was funded by the Grains Research Development Corporation of Australia (GRDC).


Other trial partners Living Farm
Download the trial report to view additional trial information

Method

Crop types Weed: Ryegrass Oilseed: Canola
Treatment type(s)
  • Crop: Variety
  • Sowing: Rate
  • Sowing: Row Spacing
Trial type
Trial design

Kojonup 2019 Ryegrass

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

Kojonup 2019 Canola

Sow date 3 May 2019
Harvest date Unknown
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
Kojonup, WA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Kojonup, WA Sodosol
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 Kojonup WA
2019 241.6mm
2018 261.7mm
2017 279.3mm
2016 297.3mm
2015 249.0mm
2014 258.4mm
2013 271.2mm
2012 280.2mm
2011 290.3mm
2010 225.1mm
2009 275.4mm
2008 274.3mm
2007 262.5mm
2006 239.9mm
2005 272.9mm
2004 257.1mm
2003 252.5mm
2002 222.4mm
2001 185.1mm
2000 258.8mm
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

Loading

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.

Kojonup WA

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

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

2019 trial report



Trial last modified: 20-03-2023 15:10pm AEST