Researcher(s) |
Ben Fleet Gurjeet Gill |
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Contact email | gurjeet.gill@adelaide.edu.au |
Contact phone | 08 83137744 |
Year(s) | 2019 |
Contributor | School of Agriculture, Food and Wine - The University of Adelaide |
Trial location(s) |
Minnipa, SA
|
Investigate the influence of barley row spacing, seedbed utilisation and herbicides on ryegrass management.
The herbicide treatment had a significant effect on annual ryegrass (ARG) plant density (P<0.001) in this field trial at Minnipa. Favourable rain events in May were highly suitable for the activity of both pre-emergent herbicides investigated in this trial. Averaged across the row spacing and seed boot treatments, Trifluralin and Boxer Gold reduced ARG plant density by 20% and 90%, respectively. The density of ARG spikes was significantly influenced by the row spacing (P<0.001), seed boot treatment (P=0.027), and the herbicide treatment (P<0.001). The 25cm row spacing had 20% lower ARG spike density than the 37.5cm row spacing treatment. The splitter seed boot treatment had 12% lower ARG spike density than the narrow seed boot treatment. Trifluralin only reduced ARG spike density by 20% compared to the untreated control, whereas Boxer Gold caused a 73% reduction in ARG spike density. ARG seed production was also significantly affected by the row spacing (P=0.003), seed boot (P=0.01), and the herbicide treatment (P<0.001). The normal (25 cm) row spacing set 38% less seed than the wide row spacing. The splitter seed boot treatment also had 32% lower ARG seed set compared to the narrow seed boot. ARG produced 4792 seeds/m2 in the untreated control, which was reduced by 11% by Trifluralin and 69% by Boxer Gold. Presence of ARG at 262 plants/m2 in the untreated control, reduced barley grain yield by 8% compared to Trifluralin or 16% compared to Boxer Gold. However, it was still profitable to control ARG with effective herbicide treatments. Based on cash grain price of Feed Barley of $250/t in 2019, Trifluralin would be expected to increase the gross margin by $32/ha as compared $71/ha increase for Boxer Gold.
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 | N/A |
Acknowledgments |
We thank GRDC for providing funding for this research project and Bruce Heddle for hosting this trial. |
Other trial partners | Not specified |
Crop types | Cereal (Grain): Barley Weed: Ryegrass |
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Treatment type(s) |
|
Trial type | Experimental |
Trial design | Randomised,Replicated,Blocked |
Sow date | 20 May 2019 |
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Harvest date | Not applicable |
Plot size | Not specified |
Plot replication | Not specified |
Psuedoreplication | Not specified |
Other trial notes |
Please refer to the attached PDF document for detailed information on results and discussion. |
Sow date | Not specified |
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Harvest date | Not specified |
Plot size | Not specified |
Plot replication | Not specified |
Psuedoreplication | Not specified |
Other trial notes |
Please refer to the attached PDF document for detailed information on results and discussion. |
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.