The interaction between wheat (Triticum aestivum) establishment timing and pre-emergent herbicides choice on annual ryegrass (Lolium rigidum Gaud.) growth and competition.

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
Miling, WA
York WA, WA
The interaction between wheat (Triticum aestivum) establishment timing and pre-emergent herbicides choice on annual ryegrass (Lolium rigidum Gaud.) growth and competition. locations
Aims

This research aims to investigate the effect of wheat time of sowing and seeding rate, on the effectiveness and degradation of pre-emergent herbicides commonly used to control annual ryegrass in no tillage farming systems.

Key messages

In 2019, the three trial sites experienced vastly different rainfall and crop germination patterns. The Kojonup site had good soil moisture throughout the growing season resulting in a rapid crop germination. The York and Miling sites however were seeded into completely dry conditions with the wheat germination in the TOS 1 treatments occurring more than six weeks after seeding. The bioassay experiment showed that at all sites, Sakura was the most persistent herbicide. This was evident in the field results where the persistence and activity of Sakura resulted in lower ryegrass emergence, lower seed production and a higher wheat yield. Furthermore, the results showed that at the Kojonup site, which was sown into excellent soil moisture, Trifluralin was also very effective.

The TOS response was variable; the first time of seeding showed better weed control and wheat yields at Miling and York whereas the delayed time of seeding was advisable at the moist Kojonup site. It was also found that increasing the wheat density increased crop competition which in turn reduced ryegrass emergence, ryegrass biomass and ryegrass seed production for all herbicide treatments studied. 

Lead research organisation Australian Herbicide Resistance Initiative
Host research organisation N/A
Trial funding source GRDC 9175134
Related program N/A
Acknowledgments N/A
Other trial partners Living Farm
Download the trial report to view additional trial information

Method

Crop types Cereal (Grain): Wheat Weed: Ryegrass
Treatment type(s)
  • Herbicide: Type
  • Sowing: Timing
Trial type
Trial design

Kojonup 2019 Wheat

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

Miling 2019 Wheat

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

York WA 2019 Ryegrass

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

York WA 2019 Wheat

Sow date 20 April 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
Miling, WA Not specified
York WA, WA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Kojonup, WA Sodosol
Miling, WA Kandosol
York WA, 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 Miling WA York WA WA
2019 241.6mm181.5mm116.3mm
2018 261.7mm206.8mm182.6mm
2017 279.3mm202.2mm208.4mm
2016 297.3mm232.8mm161.8mm
2015 249.0mm212.3mm140.0mm
2014 258.4mm160.4mm159.4mm
2013 271.2mm197.5mm172.3mm
2012 280.2mm234.7mm184.9mm
2011 290.3mm225.6mm201.6mm
2010 225.1mm204.7mm187.8mm
2009 275.4mm213.4mm241.4mm
2008 274.3mm225.9mm220.0mm
2007 262.5mm224.4mm198.4mm
2006 239.9mm232.9mm190.6mm
2005 272.9mm197.3mm179.5mm
2004 257.1mm195.9mm178.2mm
2003 252.5mm197.2mm190.5mm
2002 222.4mm157.0mm144.6mm
2001 185.1mm150.7mm175.5mm
2000 258.8mm233.8mm282.9mm
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.

Kojonup WA

Miling WA

York WA WA

Kojonup WA

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

NOTE: Exact trial site locality unknown - Climate data may not be accurate
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York WA 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: 20-03-2023 15:20pm AEST