Improving pre-emergent herbicide spray coverage in stubble retention systems

CC BY 4.0

Research organisaton
Funding source

Trial details

Researcher(s) Sarah Noack (Hart Field Site Group)
Year(s) 2017
Contributor Hart Field Site Group
Trial location(s) Hart, SA
Improving pre-emergent herbicide spray coverage in stubble retention systems locations

To investigate improvements for pre-emergent herbicide spray coverage in stubble retention systems.

Key messages

While water volume and droplet size were the focus of this study there are further measures that can be taken by the spray operator to increase herbicide penetration in stubble. In a recent paper by Gordon (2017) some of the strategies highlighted were:

  • Reducing spraying travel speeds can generally improve the penetration into stubble and improve the evenness of the application.
  • Narrower nozzle spacings can also be of benefit, provided the spray quality and boom height are suitable. 
  • Alternately, many operators have plumbed machines with nozzle spacings to match the crop row width. Where nozzles are positioned in the centre of the inter-row gap between standing stubble lines, the nozzle height may be lowered to obtain an overlap close to the base of the stubble. This may improve soil contact and reduce interception by the stubble, provided spraying speeds and wind speeds do not excessive.
Lead research organisation Hart Field Site Group
Host research organisation N/A
Trial funding source SAGIT
Related program N/A

The Hart Field-Site Group thanks the University of Adelaide weeds team and Bill Gordon for assistance with trial development for this project. We also gratefully acknowledge SAGIT for project funding (H114).

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


Crop type No crop specified
Treatment type(s)
  • Herbicide
  • Stubble
Trial type Article/commentary
Trial design Unknown

Hart 2017

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
Hart, SA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Hart, SA Chromosol
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 Hart SA
2017 650.0mm
2016 659.9mm
2015 597.6mm
2014 638.6mm
2013 622.8mm
2012 654.6mm
2011 683.8mm
2010 686.7mm
2009 669.9mm
2008 633.9mm
2007 649.9mm
2006 651.2mm
2005 675.4mm
2004 633.0mm
2003 652.2mm
2002 649.4mm
2001 674.5mm
2000 625.6mm
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



Derived climate information

No observed climate data available for this trial.
Derived climate data is determined from trial site location and national weather sources.

Hart SA


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 report and links

2017 trial report

Trial last modified: 11-06-2019 15:12pm AEST