The interaction between the seeding rate and seed size of hybrid and open pollinated canola (Brassica napus) varieties on ryegrass (Lolium rigidum) growth and competition

2019

Research organisatons
Funding source

Trial details

Researcher(s) Mike Ashworth
Year(s) 2019
Contributor School of Agriculture and Environment - The University of Western Australia
Trial location(s) , WA
The interaction between the seeding rate and seed size of hybrid and open pollinated canola (Brassica napus) varieties on ryegrass (Lolium rigidum) growth and competition locations
Aims

The objective of this study is to determine the optimal combinations of canola cultivar, seeding rate and seed size on annual ryegrass seed production and canola growth and yield.

Key messages

The results of this study suggests:

  • Crop emergence was affected by pollination type (greater in open pollinated var. Bonito), increased seeding rates and increased seed size at both the Cunderdin and Mingenew sites, with seed size and seeding rate interactions at Mingenew.
  • Weed densities were reduced by seed size and seeding rates at Cunderdin. No significant decreases were identifies at Mingenew due to the high weed densities.
  • Ryegrass biomass was reduced by Pollination type (reduced in the open pollinated var. Bonito), increased seed size at both the Cunderdin and Mingenew sites. Seeding rate was found to reduce ryegrass biomass at the Cunderdin site.
  • Canola yield was increased by increasing seeding rate and seed size in both weedy and weed free situations at the Cunderdin and Mingenew sites.
Lead research organisation Australian Herbicide Resistance Initiative
Host research organisation Australian Herbicide Resistance Initiative
Trial funding source GRDC 9175962
Related program N/A
Acknowledgments

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


Other trial partners University of Adelaide
Download the trial report to view additional trial information

Method

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

2019 Ryegrass

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

2019 Canola

Sow date Unknown
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
, WA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
, WA Kandosol
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 WA
2019 210.0mm
2018 298.6mm
2017 324.0mm
2016 280.6mm
2015 249.6mm
2014 234.8mm
2013 277.8mm
2012 250.0mm
2011 235.3mm
2010 205.1mm
2009 248.0mm
2008 234.3mm
2007 221.4mm
2006 234.0mm
2005 174.6mm
2004 202.6mm
2003 206.6mm
2002 158.6mm
2001 197.3mm
2000 306.8mm
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

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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.

WA

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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

2019 trial report



Trial last modified: 03-01-2023 14:40pm AEST