Effect of combinations of sowing time, seed rate and herbicides on ryegrass management in barley

2021
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) 2021
Contributor School of Agriculture, Food and Wine - The University of Adelaide
Trial location(s) Westmere,
Effect of combinations of sowing time, seed rate and herbicides on ryegrass management in barley locations
Aims

This field trial was undertaken at Westmere in Victoria, a high rainfall environment, to investigate factorial combinations of sowing time, seed rate and herbicides on the management of annual ryegrass in barley.

Key messages
  • Ryegrass plant density in this trial was significantly affected by the herbicide treatments (P=0.002). Boxer Gold IBS had the highest ryegrass plant density, which was significantly greater than the tank-mix application of Boxer Gold with Treflan or Overwatch followed by early post-emergent Boxer Gold.
  • The results obtained for ryegrass head or spike density highlight the capacity of this weed species to take advantage of cold and wet conditions. In this trial each ryegrass plant produced around 10 heads, which could cause a sizable build-up in ryegrass seedbank for subsequent crops.
  • Addition of Treflan to Boxer Gold and sequential application of Boxer Gold after Overwatch caused a significant reduction in ryegrass spikes as compared to application of Boxer Gold or Overwatch by itself.
  • Even though the effects of crop sowing on barley grain yield were small, the difference between TOS 2 (10.6 t/ha) and TOS 1 (10.1 t/ha) was statistically significant (P=0.03). Boxer Gold + Treflan mixture and sequential treatment of Overwatch followed by Boxer Gold produced higher yield than the single herbicide treatments.
Lead research organisation School of Agriculture, Food and Wine - The University of Adelaide
Host research organisation Southern Farming Systems
Trial funding source GRDC 9175134
Related program GRDC - Weeds
Acknowledgments

We thank GRDC for funding this research and the Southern Farming Systems group for hosting the trial.


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

Method

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

Westmere 2021 Barley

Sow date 6 May and 21 May
Harvest date Not applicable
Plot size Not specified
Plot replication Not specified

Westmere 2021 Ryegrass

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
Westmere, Not specified
Derived trial site soil information
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.

Westmere

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

2021 trial report



Trial last modified: 20-03-2023 16:35pm AEST