| Researcher(s) |
Ben Fleet Gurjeet Gill |
|---|---|
| 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) |
Riverton, SA, SA
|
This field trial at Riverton was undertaken to investigate factorial combinations of sowing time, seed rate and herbicides on the management of brome grass in wheat.
The average seedbank of brome grass at the site was 1863 ± 303 seeds/m2. Brome grass at this site was effectively controlled (>80%) by delaying sowing by 2 weeks, with treatment effects from herbicide and wheat seed rate treatment only being significant in the early sown plots, where brome grass density was high. These results clearly indicate that brome grass population present at this site has very low seed dormancy and germinates readily after the season opening rains and can be effectively controlled with a knockdown herbicide. Wheat grain yield results reflected the level of brome grass control with herbicide and wheat seed rate treatments improving yields significantly as brome suppression improved. These treatments did not have a significant effect on yield when sowing was delayed because brome was effectively controlled by the knockdown herbicides. In the early sown crop when brome grass was controlled effectively with Intercept®, the 2 week delay in sowing caused a 9% reduction in wheat yield.
| Lead research organisation |
School of Agriculture, Food and Wine - The University of Adelaide |
|---|---|
| Host research organisation | N/A |
| Trial funding source | GRDC 9175134 |
| Related program | N/A |
| Acknowledgments |
We thank GRDC for funding this research project and Mark McInerney from Riverton for hosting the trial. |
| Other trial partners | Not specified |
| Crop types | Cereal (Grain): Wheat Weed: Brome grass |
|---|---|
| Treatment type(s) |
|
| Trial type | Experimental |
| Trial design | Randomised,Replicated,Blocked |
| Sow rate or Target density | 100 seeds/m2; 150 seeds/m2; 200 seeds/m2 |
|---|---|
| Sow date | TOS 1: 16 May, 2019; TOS 2: 31 May, 2019 |
| Harvest date | Not applicable |
| Trial design method | SPD Split Plot Design |
| Plot size | 1.83m x 10m |
| Plot replication | 3 |
| Plot randomisation | Y |
| Fertiliser |
At sowing – DAP + zinc + impact (18:20:0:2) @ 100 kg/ha, Urea (46:0:0) @ 100kg/ha mid tiller and Z31 (separately for TOS) |
| Herbicide |
Pre-emergents: 15 May and 30 May, 2019 (applied just before seeding) Post emergent: tillering stage Trifluralin (480 g/L trifluralin) 2 L/ha + Avadex Xtra (500 g/L triallate) 2 L/ha IBS Sakura (850 g/kg pyroxasulfone) 118 g/ha + Avadex Xtra (500 g/L triallate) 2L/ha IBS Trifluralin (480 g/L trifluralin) 2 L/ha + Avadex Xtra (500 g/L triallate) 2 L/ha IBS fb Intercept (imazamox 33g/L + imazapyr 15g/L) 750 mL/ha post |
| Sow rate or Target density | Not specified |
|---|---|
| Sow date | Not applicable |
| Harvest date | Not applicable |
| Trial design method | SPD Split Plot Design |
| Plot size | 1.83m x 10m |
| Plot replication | 1 |
| Plot randomisation | Y |
| Fertiliser | Not specified |
| Herbicide | 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.
