The control of summer weeds using larger spray droplets and more adverse weather conditions


Research organisaton
Funding source

Trial details

Researcher(s) Bill Gordon, Peter Hooper, Roy Rogers (Hart), Mick Faulkner, Jeff Braun ( Mid North High Rainfall Zone), Peter Cousins and Allan Mayfield
Year(s) 2012
Contributor Hart Field Site Group
Trial location(s) , SA
, SA
The control of summer weeds using larger spray droplets and more adverse weather conditions locations

To measure the efficacy of coarser spray droplets on the control of two identified common summer weed species, and the influence of more adverse weather conditions.

Key messages
  • Trials conducted in 2012 have shown that larger droplets and variations in droplet application direction can successfully control summer weeds, compared to the traditionally favoured medium droplets.
  • This includes a variation of weed species, different herbicides types and application within conditions that are not generally conducive to summer spraying.
  • The work has shown that for contact herbicides like Spray.Seed extremely coarse droplets can give reduced control, regardless of water rate.
Lead research organisation Hart Field Site Group
Host research organisation Hart Field Site Group
Trial funding source GRDC
Related program N/A

Many thanks are extended to Nick Ashby, Allen Kelly and Andrew Hawker for the use of their land and cooperation with this trial work.


Other trial partners Mid North High Rainfall Zone group
Download the trial report to view additional trial information


Crop type Barley
Treatment type(s)
  • Herbicide
  • Herbicide: Application
  • Herbicide: Method
Trial type
Trial design


Sow date Not specified
Harvest date Not specified
Plot size 2.5m x 20m
Plot replication 4


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
, SA Calcarosol
, SA Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
, SA Chromosol
, SA Chromosol
National soil grid Source
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



SA 2012

Observed climate information

Rainfall trial gsr (mm) 168mm

Derived climate information







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.

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Trial last modified: 11-12-2019 07:59am AEST