Effect of sowing time x seed rate x herbicides on ryegrass management in barley (Washpool, SA)

2020
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 +61428592825
Year(s) 2020
Contributor School of Agriculture, Food and Wine - The University of Adelaide
Trial location(s) Washpool, SA, SA
Effect of sowing time x seed rate x herbicides on ryegrass management in barley (Washpool, SA) locations
Aims

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

Key messages

A field trial was undertaken at Washpool in 2020 to investigate combinations of barley sowing time, seed rate and herbicide treatments to control annual ryegrass (ARG). The average seedbank of ARG at the site was 1949 ± 496 seeds/m2. Time of sowing significantly influenced ARG plant density, with lower ARG plant density when seeding was delayed (P<0.001). Herbicide treatment had a significant influence on ARG plant density (P<0.001) due to 58% reduction in ARG plant density by the tank-mix of Boxer Gold and Trifluralin compared to the untreated control (155 plants/m2). Herbicide treatments also reduced ARG spike density and seed production. The mixture of Boxer Gold and Trifluralin reduced ARG spike density and seed production compared to the untreated controls by 45% and 42% respectively. ARG seed set was significantly lower in TOS 1 (18,911 seeds/m2) than in TOS 2 (30,990 seeds/m2) (P<0.001). Even though there was a higher ARG plant density in TOS 1 than TOS 2, greater competitive ability of early sown barley was able to reduce ARG spike density and seed production. Barley grain yield at this site was significantly affected by the time of sowing (P=0.014) and herbicide treatments (P=0.009). The control of ARG by the mixture of Boxer Gold and Trifluralin was reflected in barley yield improvement. The results of this study clearly showed that delayed sowing of barley can reduce ARG plant density but reduced competitive ability of the later sown crop often allows greater seed set by ryegrass that is also associated with a yield penalty.

Lead research organisation School of Agriculture, Food and Wine - The University of Adelaide
Host research organisation Hart Field Site Group
Trial funding source GRDC 9175134
Related program GRDC - Weeds
Acknowledgments

GRDC for providing funding for this research, Hart Field Site group for managing the trial and SARDI for seeding and harvest of the plots.


Other trial partners SARDI, Clare
Download the trial report to view additional trial information

Method

Crop types Cereal (Grain): Barley Weed: Ryegrass
Treatment type(s)
  • Herbicide: Type
  • Sowing: Rate
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Washpool, SA 2020 Barley

Sow date 8 May and 29 May
Harvest date Not applicable
Plot size Not specified
Plot replication Not specified
Psuedoreplication Not specified

Washpool, SA 2020 Ryegrass

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Psuedoreplication 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
Washpool, SA, SA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Washpool, 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.

Washpool, 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 16:36pm AEST