Swathing cereals for barley grass weed seed collection


Research organisaton
Funding source

Trial details

Researcher(s) Amanda Cook (SARDI)
Year(s) 2018
Contributor SARDI Minnipa Agricultural Centre
Trial location(s) Hardy Hill Rd, SA
Swathing cereals for barley grass weed seed collection locations

To assess barley grass weed seed capture by swathing and weed seed capture in chaff dumps after harvest, to determine how effective these practices can be in contributing towards an IWM program for barley grass on upper Eyre Peninsula.

Key messages
  • In 2016 only 40% of the barley grass was greater than 17 cm tall and had the potential to be collected by early swathing, or 60% of the barley grass seed had already shed or was below harvest weed seed collection height.
  • Sampling of the swathed paddock area showed slightly better barley grass weed seed collection using swathing than from the rest of the paddock which was harvested normally.
  • Seed capture at both swathing and harvest is higher with annual ryegrass than with barley grass.
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. Thank you to Bruce Heddle for his inspiration, and for having the research and monitoring on his property.

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


Crop type Wheat
Treatment type(s)
  • Harvest: Timing
Trial type Experimental
Trial design Replicated

Hardy Hill Rd 2018

Sowing machinery

At harvest in 2016, swathing was undertaken by Bruce Heddle in a Mace wheat crop sown at 50 kg/ha which was grazed early then allowed to recover for harvest. Samples were collected pre-harvest for weed assessment on 21 September 2016, and post-harvest soil and chaff samples were taken on 15 December 2016, to be assessed in weed seed trays. Due to the poor season and limited seed germination in 2017, the weed seed trays were also left during the 2018 season to further assess grass weed germination.


In-crop paddock monitoring for grass weed populations was undertaken and grass weeds were assessed at 10 GPS points along two transects for weed density, with six counts taken at each sample point.


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
Hardy Hill Rd, SA Red loam
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Hardy Hill Rd, SA Calcarosol
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 Hardy Hill Rd SA
2018 173.4mm
2017 184.4mm
2016 165.4mm
2015 156.2mm
2014 204.7mm
2013 149.5mm
2012 162.0mm
2011 180.6mm
2010 172.3mm
2009 190.5mm
2008 152.1mm
2007 154.4mm
2006 177.5mm
2005 151.6mm
2004 126.7mm
2003 129.5mm
2002 141.7mm
2001 158.8mm
2000 162.3mm
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



Hardy Hill Rd SA 2018

Observed climate information

Rainfall avg ann (mm) 325mm
Rainfall avg gsr (mm) 241mm
Rainfall trial total (mm) 281mm
Rainfall trial gsr (mm) 155mm

Derived climate information

Hardy Hill Rd SA


Some data on this site is sourced from the Bureau of Meteorology

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.

Trial last modified: 08-10-2019 14:53pm AEST