Improving crop competition in wheat and durum


Research organisatons
Funding source

Trial details

Researcher(s) Kenton Porker and Rob Wheeler (SARDI)
Year(s) 2013
Contributor Hart Field Site Group
Trial location(s) Site 5, Hart, SA
Improving crop competition in wheat and durum locations

To evaluate the relative competitiveness of durum wheat compared to barley and bread wheat, against annual ryegrass grown under different management practices tailored to influence crop competition.

Key messages
  • Fathom barley was more competitive than Hindmarsh barley, bread wheat and durum.
  • Increasing seeding rate and seed bed utilisation improved crop weed competition (by up to 60%) without a yield penalty or quality downgrading.
  • Tjilkuri and Mace sown at 300 seeds/m2 with a spreader boot achieved similar ARG suppression as Fathom barley sown at 150 seeds/m2 .
  • Pre-emergent herbicide application offered the best control of ARG in this trial across all varieties and agronomic management factors. 
  • Non chemical strategies can significantly enhance crop’s competitive ability with weeds and should be integrated with herbicide use.
Lead research organisation South Australian Research and Development Institute
Host research organisation Hart Field Site Group
Trial funding source SAGIT
Related program N/A
Acknowledgments N/A
Other trial partners Not specified
Download the trial report to view additional trial information


Crop types Barley
Treatment type(s)
  • Crop
  • Crop: Type
Trial type
Trial design

Hart 2013 Barley

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

Hart 2013 Wheat

Sow date 24 May 2013
Harvest date Not specified
Plot size 1.4m x 10m
Plot replication 3

DAP (18:20) + 2% Zn @ 70 kg/ha

50 kg N @ GS31

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 5, Hart, SA Calcarosol
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 5, Hart, 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



Site 5, Hart SA 2013

Observed climate information

Rainfall trial gsr (mm) 303mm

Derived climate information

Site 5, 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 last modified: 09-12-2019 19:06pm AEST