Researcher(s) |
Ben Fleet Gurjeet Gill |
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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) |
Minnipa, SA
|
To investigate the effect of combinations of herbicides, crop row spacing and seed-bed utilisation on ryegrass management in wheat.
The herbicide treatment had a significant effect on annual ryegrass (ARG) plant density (P<0.001) in this field trial at Minnipa. Favourable soil moisture in early May was suitable for the activity of both pre-emergent herbicide treatments investigated in this trial. Averaged across the row spacing and seed boot treatments, Boxer Gold + Trifluralin and Sakura + Avadex reduced ARG plant density by 71% and 72%, respectively. The density of ARG spikes was significantly influenced by the row spacing (P<0.001), seed boot treatment (P=0.002), and the herbicide treatment (P<0.001). The 25cm row spacing had 43% lower ARG spike density than the 37.5cm row spacing treatment. The splitter seed boot treatment had 35% lower ARG spike density than the narrow seed boot treatment. Boxer Gold + Trifluralin reduced ARG spike density by 68% compared to the untreated control, whereas Sakura + Avadex caused a 70% reduction in ARG spike density. ARG seed production was also significantly affected by the row spacing (P<0.001), seed boot (P=0.003), and the herbicide treatment (P<0.001). The normal (25 cm) row spacing set 53% less seed than the wide row spacing. The splitter seed boot treatment also had 39% lower ARG seed set compared to the narrow seed boot. There was a 73% reduction in ARG seed production in the normal row spacing and splitter boot treatment compared to wide row spacing with single seed boot treatment. ARG produced 15483 seeds/m2 in the untreated control, which was reduced by 62% by Boxer Gold + Trifluralin and 67% by Sakura + Avadex. This level of ARG seed production would be more than adequate to allow problematic weed establishment in crops grown next year. Therefore, growers need to consider integration of harvest weed seed control or other management tactics for ARG management. Presence of ARG at 76 plants/m2 in the untreated control, reduced wheat grain yield by 29% compared to Boxer Gold + Trifluralin or 30% compared to Sakura + Avadex.
Lead research organisation |
School of Agriculture, Food and Wine - The University of Adelaide |
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Host research organisation |
SARDI Minnipa Agricultural Centre |
Trial funding source | GRDC 9175134 |
Related program |
GRDC - Weeds |
Acknowledgments |
GRDC for funding this research and the local grower for providing land for the trial. |
Other trial partners | Not specified |
Crop types | Weed: Ryegrass Cereal (Grain): Wheat |
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Treatment type(s) |
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Trial type | |
Trial design |
Sow date | Not specified |
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Harvest date | Not specified |
Plot size | Not specified |
Plot replication | Not specified |
Sow date | 8 May 2020 |
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Harvest date | Not applicable |
Plot size | Not specified |
Plot replication | Not specified |
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.