Short term rotations and herbicide selection for reducing annual ryegrass

2015
CC BY 4.0

Research organisaton
Funding source

Trial details

Researcher(s) Angus MacLennan (Bayer CropScience)
Tony Pratt (FarmLink)
Year(s) 2015
Contributor FarmLink Research
Trial location(s) Temora, NSW
Further information View external link
Short term rotations and herbicide selection for reducing annual ryegrass locations
Aims
  • To examine the impact rotation has on the population of annual ryegrass under different systems.
  • To answer the questions: what is the effect of specific herbicides applied in the wheat crop in year one have on the annual ryegrass populations in year two before and after sown to canola (RR & TT) and how and where are herbicides best used in the rotation to maximise efficacy?
Key messages

Ultimately herbicide selection should be based on the suitability of that product to the sowing conditions, weed pressure and rotational fit while trying to completely control ARG in both single & consecutive years, managing for chemical groups.  Annual ryegrass populations can incre3ase rapidly if in any one year poor control occurs.  Therefore careful rotational planning to include crop types, vaqrieties and herbicide technologies is essential in an overarching control strategy.  From the results observed in this two year trial it is evident that effective weed control in year one results in a reduction in seed season are necessary to reduce weed seed bank numbers potentially making Roundup Ready canola systems more viable in a lower risk situation.  Herbicides with lo binding, moderate solubility and longer persistence such as Sakura tend to offer higher levels of weed control.  It is also clear that herbicide technology is not straight forward and attention to detail can mean the difference between a mediocre and first-rate result.  Chemical efficacy can be influenced by a number of factors, especially when using pre-emergent herbicides in a combined chemical IWM strategy.  Little things like stubble load, method of application, level of seedbed cultivation, incorporation timing and technique, rainfall after sowing and the suitability of that herbicide for the particular situation can add incremental gains for the overall result.  For RR canola and TT canola ensure to use every option available, don't settle for just 1 application of RR or rely solely on triazine chemicals for effective control of weeds.

Annual ryegrass control is a long term holistic proposition and no 1 or 2 control methods will solve your issues.  It must be tackled with multiple techniques.

Lead research organisation N/A
Host research organisation N/A
Trial funding source Bayer
Related program N/A
Acknowledgments

 Tony Praff (FarmLink Research) and Angus MacLennan (Bayer CropSciences)


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

Method

Crop type Cereal (Grain): Wheat
Treatment type(s)
  • Crop: Rotation
Trial type Experimental
Trial design Replicated

Temora 2015

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
Temora, NSW Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Temora, NSW 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 Temora NSW
2015 580.1mm
2014 536.2mm
2013 552.2mm
2012 603.7mm
2011 615.3mm
2010 622.2mm
2009 570.3mm
2008 556.2mm
2007 475.6mm
2006 514.6mm
2005 516.7mm
2004 454.7mm
2003 422.3mm
2002 414.1mm
2001 454.0mm
2000 430.4mm
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.

Temora NSW

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

2015 trial report



Trial last modified: 05-06-2019 12:02pm AEST