Canola density response in medium rainfall environments – Wongan Hills

CC BY 4.0

Research organisatons
Funding source

Trial details

Researcher(s) Bob French (DAFWA)
Year(s) 2014
Contributor Liebe Group
Trial location(s) Wongan Hills, WA
Canola density response in medium rainfall environments – Wongan Hills locations

To compare the plant density response of yield and oil content between hybrid and OP canola in TT and RR herbicide tolerance groups.

Key messages
  • In a low yielding season canola yield reached a plateau at between 20 and 40 plants/m².
  • Hybrid canola reached the plateau at lower density than open-pollinated canola.
  • Optimum density ranged from 10 plants/m² for hybrid canola to over 65 plants/m² for open-pollinated (OP) Triazine tolerant (TT) canola.
  • Hybrid canola had a significant yield advantage over open-pollinated canola in a below average season.
Lead research organisation Department of Agriculture and Food WA
Host research organisation N/A
Trial funding source GRDC
Related program N/A

Shari Dougall and Bruce Thorpe, DAFWA Wongan Hills.

Sally Sprigg and Laurie Maiolo, DAFWA Merredin, Mark Seymour, DAFWA Esperance, and GRDC for funding.

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


Crop type Canola
Treatment type(s)
  • Sowing
  • Sowing: Rate
Trial type Experimental
Trial design Replicated

Wongan Hills 2014

Sow rate or Target density various as per protocol
Sow date 13 May 2014
Harvest date Not specified
Plot size 20m x 1.54m
Plot replication 3

13/05/2015: 100 kg/ha Agstar banded at seeding

02/07/2014: 60 L/ha Flexi-N


10/05/2014: 1.5 L/ha Roundup

13/05/2014: 1.5 L/ha Trifluralin, 2 L/ha Spray.Seed 250

27/05/2014: 900 gm/ha Roundup Ready on RR treatments

10/06/2014: 2.2 kg/ha Atrazine on TT treatments, 1% Spray Oil



13/05/2014: 100 mL/ha Bifenthrin

05/06/2014: 0.85 mL/ha Dimethoate

10/08/2014: 300 mL/ha Alpha-cypermethrin

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
Site Depth Type pH EC P K N A OC CAT
Wongan Hills, WA 0 - 10cm Brown Sandy Earth (With Gravel) 6.40 0.09
Wongan Hills, WA 10 - 20cm Brown Sandy Earth (With Gravel) 5.30 0.07
Wongan Hills, WA 20 - 30cm Brown Sandy Earth (With Gravel) 5.30 0.06
Wongan Hills, WA 30 - 40cm Brown Sandy Earth (With Gravel) 6.00 0.06
Wongan Hills, WA 40 - 50cm Brown Sandy Earth (With Gravel) 6.80 0.10
Soil conditions
Trial site Soil texture
Wongan Hills, WA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Wongan Hills, 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 Wongan Hills WA
2014 147.7mm
2013 193.2mm
2012 191.1mm
2011 172.5mm
2010 146.8mm
2009 183.7mm
2008 202.7mm
2007 163.7mm
2006 176.1mm
2005 164.6mm
2004 182.2mm
2003 192.8mm
2002 134.6mm
2001 139.2mm
2000 207.0mm
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



Wongan Hills WA 2014

Observed climate information

Rainfall trial gsr (mm) 276mm

Derived climate information

Wongan Hills WA


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

SILO weather estimates sourced from
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: 23-07-2019 11:10am AEST