Effect of wheat seed rate and pre-emergent herbicides in annual ryegrass control (Roseworthy, 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) Roseworthy campus, University of Adelaide, SA
Effect of wheat seed rate and pre-emergent herbicides in annual ryegrass control (Roseworthy, SA) locations
Aims

This field trial at Roseworthy was undertaken to investigate factorial combinations of wheat seed rate and pre-emergent herbicides on the management of annual ryegrass.

Key messages

Pre-emergent herbicide treatments had a significant effect on annual ryegrass (ARG) plant density (P<0.001), ARG spike density (P<0.001) and its seed production (P<0.001). Wheat seed rate on the other hand, did not have any effect on ARG spike density or ARG seed set. In this trial, the lowest target wheat density was 150 plants/m2, which appears to be adequate for providing competition with ARG. Even with the use of the best pre-emergent herbicide treatments, ARG was able to produce more than 28,000 seeds/m2. These results indicate that even with the best pre-emergent herbicides currently available, ARG seedbanks are likely to build-up after the wheat phase in problem paddocks. Therefore, integration of pre-emergent herbicides with tactics such as harvest weed seed control is extremely important. ARG was highly competitive with wheat in this trial, which was reflected in large yield increases in the effective treatments. For example, wheat yield increased by 70% (1.4 t/ha) in the Overwatch® treatment compared to the untreated control. In contrast Boxer Gold®, which had higher ARG spike density also provided a smaller increase in wheat grain yield.

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 funding 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: Rate
Trial type
Trial design

Roseworthy campus, University of Adelaide 2020 Ryegrass

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

Roseworthy campus, University of Adelaide 2020 Wheat

Sow date 15 May 2020
Harvest date Not applicable
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
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
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

Loading

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

Loading
Loading
Loading

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 16:31pm AEST