Using sowing direction and row spacing for weed management in the Mallee

CC BY 4.0

Research organisaton
Funding source

Trial details

Researcher(s) Kelly Angel (BCG)
Year(s) 2015
Contributor Central West Farming Systems
Trial location(s) Jil Jil, VIC
Using sowing direction and row spacing for weed management in the Mallee locations

To determine if sowing direction and row spacing can be used to influence grass weed populations and growth,
and their impact on crop performance in the Mallee.

Key messages
  • Yields were significantly higher under narrow row spacing, but sowing direction had no influence on yield.
  • Weeds had a significant effect on yield, but the scale of yield penalty (t/ha yield loss) did not alter with row spacing or sowing direction in 2015.
  • Weeds established faster where row spacings were wider, however by late tillering, all treatments had similar weed numbers and biomass levels.
Lead research organisation Central West Farming Systems
Host research organisation N/A
Trial funding source GRDC CWF00020
Related program N/A
  • This research was funded by the GRDC as part of the ‘Overdependence upon agrochemicals’ project (CWF00020).
  • Agrochemicals project (CWF00020), which is led by CWFS.

Other trial partners BCG
Download the trial report to view additional trial information


Crop type Wheat
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Jil Jil 2015

Sow rate or Target density 150 plants/m²
Sowing machinery

Knife points and press wheels set at 22.5cm (9 inch), 30.5cm (12 inch) and
38cm (15 inch) row spacings.

Sow date 23 May 2015
Harvest date 11 November 2015
Plot size Not specified
Plot replication Not specified

Granulock Supreme Z @ 50kg/ha at sowing


Dual Gold @ 500ml/ha + Diuron @ 500g/ha (PSPE)

Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Treatment 1
Weed density (plants/m2)
1 22.5 cm row spacing 34.8
2 30.5 cm row spacing 43.5
3 38 cm row spacing 48.4

Weed density plants/m2

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Jil Jil, VIC Sandy clay loam
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Jil Jil, VIC 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 Jil Jil VIC
2015 769.7mm
2014 780.3mm
2013 773.8mm
2012 806.6mm
2011 826.0mm
2010 819.3mm
2009 788.3mm
2008 776.6mm
2007 783.5mm
2006 798.0mm
2005 826.8mm
2004 786.0mm
2003 808.0mm
2002 746.6mm
2001 782.2mm
2000 736.0mm
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



Jil Jil VIC 2015

Observed climate information

Rainfall avg ann (mm) 191mm
Rainfall avg gsr (mm) 129mm

Derived climate information

Jil Jil VIC

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.

Trial last modified: 20-07-2018 10:51am AEST