1. Home ::  
  2. Trial Search

Row orientation and weed competition

2015
CC BY 4.0

Research organisation
Funding source
Central West Farming Systems
<abbr title='Grains Research and Development Corporation'>GRDC</abbr>

Trial details

Researcher(s) Amanda Cook (SARDI)
Ian Richter (SARDI)
Wade Shepperd (SARDI)
Nigel Wilhelm (SARDI)
Year(s) 2015
Contributor Central West Farming Systems
Trial location(s) Minnipa, SA
Row orientation and weed competition locations
Aims

To investigate the impact of row direction and row spacing on grass weed competition and cereal performance over three years.

Key messages
  • An east-west (E-W) sowing direction increased yield over northsouth (N-S) sowing direction in an average season.
  • The results showed a decline in yield due to weed competition, but no effect on weed competition due to row direction. So sowing in an E-W direction may give a yield benefit with no difference in weed seed set.
  • The wider row spacing of 30 cm resulted in a yield reduction and greater weed biomass at harvest.
  • There were no differences in yield with ribbon seeding with either 18 or 30 cm row spacings, but ribbon seeding reduced ‘weed’ biomass.
Lead research organisation Central West Farming Systems
Host research organisation N/A
Trial funding source GRDC CWF00020
Related program N/A
Acknowledgments
  • Thank you to Sue Budarick for processing the weed counts and managing the weed germination trays.
  • Funded by the GRDC Overdependence on Agrochemicals project (CWF00020).
  • Agrochemicals project (CWF00020), which is led by CWFS.
Other trial partners EPARF and SARDI
Download the trial report to view additional trial information

Method

Crop type Cereal (Grain): Wheat
Treatment type(s)
  • Sowing : Row Spacing
Trial type Experimental
Trial design Replicated

Minnipa 2015

Sow date 21 May 2015
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Treatment 1
Treatment 2
Grain yield (t/ha)
1 █ North-South █ knife points 2.32
2 █ North-South █ knife points + weed 2.95
3 █ North-South █ ribbon spread 2.29
4 █ North-South █ ribbon + weed 1.87
5 █ East-West █ knife points 2.69
6 █ East-West █ knife points + weed 2.38
7 █ East-West █ ribbon spread 2.66
8 █ East-West █ ribbon + weed 2.45

Grain yield t/ha

Loading
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Minnipa, SA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Minnipa, 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 Minnipa SA
2015
2014
2013
2012
2011
2010
2009
2008
2007
2006
2005
2004
2003
2002
2001
2000

Climate

Derived climate information

No observed climate data available for this trial.
Derived climate data is determined from trial site location and national weather sources.

Minnipa SA

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

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 report and links

2015 trial report



Trial last modified: 12-03-2019 11:07am AEST