Monitoring barley grass in broad acre paddocks


Research organisaton
Funding source

Trial details

Researcher(s) Amanda Cook (SARDI)
Year(s) 2018
Contributor SARDI Minnipa Agricultural Centre
Trial location(s) Site 19, Minnipa Agricultural Centre, SA
Yaninee, SA
Related trials
Monitoring barley grass in broad acre paddocks locations

Barley grass weed density was monitored in three paddocks on upper EP (Minnipa Agricultural Centre (MAC), Heddle’s at Minnipa and Wilkins’ at Yaninee using an UAV during the 2017 (EPFS Summary 2017, p 83) and 2018 growing seasons at three different timings, with paddock transects conducted to verify grass weed density in paddocks.


Key messages
  • UAV imagery with skilled specialist analysis and programs has the potential to identify and map weed issues in paddocks.
  • Grass weed patches are easier to identify in legume and pasture crops than cereal crops.
  • Variability in germination and crop growth makes it harder to identify grass weed areas.
  • Data capture and analysis for analytical purposes such as grass weed mapping in individual paddocks will be beyond the skills of most farm businesses unless farmers have a special interest in this area.
  • Group A resistant barley grass has once again been detected at the Minnipa Agricultural Centre. Barley grass resistance to Group A herbicides has been detected three times in three years, so be aware it is present current farming systems.
Lead research organisation SARDI Minnipa Agricultural Centre
Host research organisation N/A
Trial funding source SAGIT S117
Related program N/A

This research was funded by SAGIT S117. Sincere thanks to SAGIT and their extremely valuable input into regional South Australian research and researchers and keeping people in jobs. Thank you to Bruce Heddle and Wilkins families for having the research and monitoring on their property.

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


Crop type Vetch
Treatment type(s)
  • No treatment
Trial type Demonstration
Trial design Replicated

Minnipa Agricultural Centre 2018

Sowing machinery

In-crop paddock monitoring for grass weed populations

Grass weeds were assessed in crop or pasture at eight paddock-marked GPS points, and in 2018 also marked in the paddock with a large corflute sign visible in the imagery, with six or more counts taken at each sample point and each timing during the season. This was used to verify the UAV data captured at three times during the cropping season. Extra sampling points in the paddock were targeted if more information was needed to verify the imagery. The paddock photos were captured on an iPad with ‘Avenza Maps’ linked to the location in the paddock.


In 2018, grass weed assessments were undertaken on:

  • Heddle’s (sown early with barley and wheat) 13 July, 21 August, 14 September.
  • MAC (vetch) 9 August, 14 September, 18 October.
Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified

Yaninee 2018

Sowing machinery Not specified
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
Site 19, Minnipa Agricultural Centre, SA Red loam
Yaninee, SA Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 19, Minnipa Agricultural Centre, SA Calcarosol
Yaninee, SA Calcarosol
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



Site 19, Minnipa Agricultural Centre SA 2018

Observed climate information

Rainfall avg ann (mm) 325mm
Rainfall avg gsr (mm) 241mm
Rainfall trial total (mm) 181mm
Rainfall trial gsr (mm) 156mm

Derived climate information

Site 19, Minnipa Agricultural Centre SA

Yaninee SA

Site 19, Minnipa Agricultural Centre SA


Yaninee SA

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

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.

Individual Trial Project data and information and OFT metadata are licensed under a Creative Commons Attribution 4.0 International License.
The data and information accessed through OFT may also be subject to Terms of Use specified by the Trial Contributor,
in which case the Terms of Use of a Trial Contributor take precedence over other information provided on OFT.
Trial last modified: 08-10-2019 14:02pm AEST