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

2020
CC BY 4.0

Research organisaton
Funding source

Trial details

Researcher(s) Ben Fleet
Gurjeet Gill
Contact email gurjeet.gill@adelaide.edu.au
Contact phone +61428592825
Year(s) 2020
Contributor School of Agriculture, Food and Wine - The University of Adelaide
Trial location(s) Watchman, SA, SA
Effect of sowing time x seed rate x herbicides on brome grass management in barley (Watchman, SA) locations
Aims

This field trial at Watchman was undertaken to investigate factorial combinations of sowing time, seed rate and herbicides on the management of brome grass in barley.

Key messages

A field trial was undertaken at Watchman in 2020 to investigate combinations of barley sowing time, seed rate and herbicide treatments to control brome grass. The average seedbank of brome grass at the site was 2140 ± 178 seeds/m2. Delaying sowing by three weeks did not impact on barley establishment (P=0.368) and brome grass plant density (P=0.417). However, delayed sowing of barley did have a significant effect on brome panicle density (P=0.019) and it had an interaction with herbicide treatment on brome seed production (P=0.049). This lack of an effect of delayed sowing on brome plant density, compared to other brome sites indicates presence of high seed dormancy in Watchman population. Barley seed rate did not have a significant effect on brome panicle production (P=0.854), or brome seed production (P=0.392). However it did have a small, but significant impact on barley yield with a 6% increase in grain yield when barley seed rate was increased from 100 to 200 seeds/m2 (P=0.049). Increase in barley seed rate also significantly reduced barley grain contamination with brome grass seeds by 38% (P=0.049). Herbicide treatments had a significant effect on brome plant density (P<0.001), brome panicle density (P<0.001), brome seed production (P<0.001), brome grain contamination (P<0.001), and barley grain yield (P=0.023). Where IMI herbicide treatments were applied in this trial, brome grass control was improved greatly, which resulted in an increase in barley grain yield. These IMI herbicides were effective in providing high levels of brome grass control and should be considered a very useful tool in the management of brome grass. While herbicide resistance to these herbicides is common in annual ryegrass, IMI resistance in brome grass is far less common. However, over reliance on IMI herbicides should be avoided in order to preserve their activity for the future.

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

GRDC for providing funds for this research project.


Other trial partners SARDI, Clare
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
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Watchman, SA 2020 Barley

Sow date 12 May and 3 June
Harvest date Not applicable
Plot size Not specified
Plot replication Not specified

Watchman, SA 2020 Barley

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified

Watchman, SA 2020 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
Watchman, SA, SA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Watchman, SA, SA Chromosol
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.

Watchman, SA SA

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

2020 trial report



Trial last modified: 20-03-2023 16:38pm AEST