Barry Mudge (Barry Mudge Consulting for Upper North Farming Systems (UNFS))
Hart Field Site Group
To explore the effectiveness of cultural methods of grass suppression which do not involve the use of herbicides.
To find practices which both maximise crop yield in the presence of background grass populations and also suppress weed seed carry-over.
The 2016 trial results looking at cultural control techniques for barley grass largely confirmed the 2015 findings.
Increasing barley seeding rate in the presence of barley grass can provide substantial benefits to both yield and reduced weed seed carry-over. This applies particularly to competitive varieties such as Fathom, but also to less competitive varieties such as Hindmarsh.
In contrast, doubling the seeding rate of wheat had no beneficial effect on yield or weed carry-over.
Doubling the district practice seeding rate in barley substantially reduced the competitive effect of barley grass to the stage where crop yields were similar to those plots where herbicide was applied.
Lead research organisation
Upper North Farming Systems
Host research organisation
Trial funding source
The Ritchie family from Appila for their enthusiasm in providing a suitable site and regular weather updates. Nigel Wilhelm and Peter Telfer (SARDI) for assisting with trial design and trial seeding and harvest. Rochelle Wheaton, Hart Field Site for trial assessments. Amanda Cook (SARDI) for statistical analysis. GRDC for funding the trial under Project No CWF00020 ‘Overdependence on Agrochemicals’.
While all due care has been taken in compiling the information within this manual the Hart Field-Site Group Inc or researchers involved take no liability resulting from the interpretation or use of these results. We do not endorse or recommend th
Trial source data and summary not available Check the trial report PDF for trial results.
Appila SA 2016
Observed climate information
Rainfall avg ann (mm)
Rainfall avg gsr (mm)
Rainfall trial total (mm)
Rainfall trial gsr (mm)
Derived climate information
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.
Barry Mudge (Barry Mudge Consulting for Upper North Farming Systems (UNFS))
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Trial last modified: 22-05-2020 16:08pm AEST
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