Effect of planting arrangements of wheat and pre-emergence herbicides on annual ryegrass management

2019
CC BY 4.0

Research organisatons
Funding source

Trial details

Researcher(s) Ben Fleet
Gurjeet Gill
Contact email gurjeet.gill@adelaide.edu.au
Contact phone 08 83137744
Year(s) 2019
Contributor School of Agriculture, Food and Wine - The University of Adelaide
Trial location(s) Roseworthy campus, University of Adelaide, SA
Effect of planting arrangements of wheat and pre-emergence herbicides on annual ryegrass management locations
Aims

To investigate the effect of seeding systems on improving ryegrass management with pre-emergence herbicides in wheat.

Key messages

Wheat plant density was significantly affected by the planting arrangement (P=0.012). The Ribbon seeder system had the highest wheat density (171 plants/m2) as compared to the knife-point system (156 plants/m2) and the Zero row spacing (151 plants/m2). The establishment of wheat plants in the inter-row space in the Zero row spacing treatment was strongly influenced by the pre-emergent herbicide treatment (P=0.002). Trifluralin, Avadex or Boxer Gold were higher risk pre-emergent herbicides for wheat establishment, whereas Sakura appears much safer where wheat seed is placed on the soil surface in the Zero row spacing system. Annual ryegrass (ARG) plant density was not significantly affected by the planting arrangement (P=0.513) or pre-emergent herbicide treatments (P=0.13). ARG spike density was not significantly influenced by wheat planting arrangement (P=0.185). Herbicide treatment did have a significant influence on ARG spike density (P=0.023) and ARG seed production (P=0.003). The best performing herbicide treatment of Sakura + Avadex still produced 16824 ARG seeds/m2. While this is 51% lower than the Treflan + Avadex, it will replenish the soil seedbank to a highly problematic level for the future. Wheat grain yield was significantly affected by the planting arrangement (P=0.034) and the herbicide treatments (P=0.004). Even though the differences in wheat yield were small <10% for planting arrangement and <14% for herbicide treatments, they were statistically significant.

Lead research organisation School of Agriculture, Food and Wine - The University of Adelaide
Host research organisation The University of Adelaide
Trial funding source GRDC 9175134
Related program N/A
Acknowledgments

We thank GRDC for providing funds for this research project.


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

Method

Crop types Weed: Ryegrass Cereal (Grain): Wheat
Treatment type(s)
  • Herbicide: Type
  • Sowing: Method
Trial type
Trial design

Roseworthy campus, University of Adelaide 2019 Ryegrass

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Other trial notes

Please refer to the attached PDF document for details of the methods, results and discussion.

Roseworthy campus, University of Adelaide 2019 Wheat

Sow date 15 May 2019
Harvest date Not applicable
Plot size Not specified
Plot replication Not specified
Other trial notes

Please refer to the attached PDF document for details of the methods, results and discussion.

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
Roseworthy campus, University of Adelaide, SA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Roseworthy campus, University of Adelaide, SA Chromosol
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 Roseworthy campus, University of Adelaide SA
2019 198.1mm
2018 258.5mm
2017 341.1mm
2016 299.8mm
2015 264.9mm
2014 317.0mm
2013 284.7mm
2012 298.5mm
2011 342.9mm
2010 268.3mm
2009 215.9mm
2008 201.8mm
2007 245.4mm
2006 280.7mm
2005 295.1mm
2004 269.1mm
2003 262.7mm
2002 264.9mm
2001 301.9mm
2000 305.9mm
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

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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.

Roseworthy campus, University of Adelaide SA

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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

2019 trial report



Trial last modified: 20-03-2023 16:28pm AEST