Effect of sowing time, seed rate and herbicides on brome grass management in barley (Marrabel, SA)

2018
CC BY 4.0

Research organisaton
Funding source

Trial details

Researcher(s) Ben Fleet
Gurjeet Gill
Year(s) 2018
Contributor School of Agriculture, Food and Wine - The University of Adelaide
Trial location(s) Marrabel, SA
Effect of sowing time, seed rate and herbicides on brome grass management in barley (Marrabel, SA) locations
Aims

To investigate the impact of integration of sowing time and seed rate of barley with pre-emergent herbicides on brome grass density and seed production as well as on barley grain yield.

Key messages

Barley plant density was significantly influenced by the time of sowing (P=0.025) and crop seed rate (P=0.002).  Averaged across the seed rates and herbicide treatments, the first time of sowing (TOS 1) had barley density of 125 plants/m2 compared to 82 plants/m2 in TOS 2, which was related to dry soil conditions after sowing in TOS 2. Brome grass plant density was significantly affected by the time of sowing (P=0.018) and the herbicide treatments (P<0.001).  The 4-week delay in sowing between TOS 1 and TOS 2, allowed greater emergence of brome grass seedlings before the sowing of the TOS 2.  Consequently, barley sown at TOS 2 had 48% lower brome grass infestation (107.9 plants/m2) than in TOS 1 (207 plants/m2). As expected, herbicide treatments had a significant (P<0.001) effect on brome grass density. When averaged across the sowing time and seed rates, the treatment of Treflan + Avadex was only moderately effective and reduced brome grass density by 36% (173 plants/m2) relative to the untreated control (271 plants/m2). In contrast, the same pre-emergent treatment (Treflan + Avadex) followed by Intervix reduced brome grass density by 90% (28 plants/m2). When averaged across seed rates and herbicide treatments, the time of sowing barley had a significant effect on its grain yield (P=0.011). TOS 1 produced 940 kg/ha greater barley grain yield than TOS 2. The post-emergence application of Intervix to the crop treated with Treflan + Avadex further increased barley grain yield by 872 kg/ha. These results are consistent with the trends in brome grass density and panicle production. The untreated control plots produced 40% lower grain yield than the Intervix treatment, which completely controlled brome grass. These results highlight the strong competitive ability of brome grass in cereals.

Lead research organisation School of Agriculture, Food and Wine - The University of Adelaide
Host research organisation School of Agriculture, Food and Wine - The University of Adelaide
Trial funding source GRDC 9175134
Related program GRDC - Weeds
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 Cereal (Grain): Barley Weed: Brome grass
Treatment type(s)
  • Herbicide: Type
  • Sowing: Rate
  • Sowing: Timing
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Marrabel 2018 Barley

Sow date TOS 1: 24 May, 2018; TOS 2: 19 June, 2018
Harvest date Unknown
Plot size Not specified
Plot replication Not specified

Marrabel 2018 Brome grass

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
Marrabel, SA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Marrabel, SA Sodosol
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 Marrabel SA
2018 235.8mm
2017 270.0mm
2016 290.7mm
2015 250.5mm
2014 304.9mm
2013 304.8mm
2012 310.9mm
2011 331.1mm
2010 343.5mm
2009 329.5mm
2008 306.2mm
2007 326.3mm
2006 315.6mm
2005 349.6mm
2004 343.0mm
2003 384.0mm
2002 365.3mm
2001 444.3mm
2000 500.4mm
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.

Marrabel 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

2018 trial report



Trial last modified: 03-01-2023 14:59pm AEST