Researcher(s) |
A Bates (Bates Agricultural Consulting) Amanda Cook (SARDI) Ian Richter (SARDI) Wade Shepperd (Bates Agricultural Consulting) |
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Year(s) | 2015 |
Contributor | Eyre Peninsula Agricultural Research Foundation |
Trial location(s) |
Minnipa Agricultural Centre, SA
|
Related trials |
The GRDC project ‘Maintaining profitable farming systems with retained stubble - upper Eyre Peninsula’ aims to improve farm profitability while retaining stubble in farming systems on upper Eyre Peninsula (EP). Weed control in stubble retained systems can be compromised when stubbles and organic residues intercept the herbicide and prevent it from reaching the desired target, or the herbicide is tightly bound to organic matter. Reduced herbicide efficacy in the presence of higher stubble loads is a particular issue for pre-emergence herbicides. Current farming practices have also changed weed behavior with a shift in dormancy in barley grass genotypes now confirmed in many paddocks on Minnipa Agricultural Centre (MAC) (B Fleet, EPFS Summary 2011, p 177). As a part of the stubble project this trial was undertaken to assess herbicide efficacy in different stubble management systems.
Lead research organisation |
Eyre Peninsula Agricultural Research Foundation |
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Host research organisation |
SARDI Minnipa Agricultural Centre |
Trial funding source | GRDC EPF00001 |
Related program |
Maintaining profitable farming systems with retained stubble |
Acknowledgments |
Thanks to Sue Budarick for her help and processing samples from this trial. Trial funded by GRDC Maintaining profitable farming systems with retained stubble - upper Eyre Peninsula (EPF00001). |
Other trial partners | Not specified |
Crop type | Cereal (Grain): Wheat |
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Treatment type(s) |
|
Trial type | Experimental |
Trial design | Replicated |
Sow rate or Target density | 60kg/ha |
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Sowing machinery |
The trial was sown at 3-4 cm depth with an Atom-Jet spread row seeding system with press wheels (plot seeder) |
Sow date | 10 May 2015 |
Harvest date | Not specified |
Plot size | 20m x 2m |
Plot replication | 3 |
Fertiliser |
DAP @ 60 kg/ha |
Herbicide |
knockdown of 1.2 L/ha of Roundup Attack on 11 May Chemical treatments listed below were individually mixed in small pressure containers and applied on the 11 and 12 May using a shrouded boomspray at 100 L/ha of water. Control Untreated Trifluralin (1.5 L/ha) Trifluralin (2 L/ha) Trifluralin (1.5 L/ha) + Lexone (Metribuzin) 180 g (post) Trifluralin (1.5 L/ha) + Diuron 900 (400 g/ha) (pre-emergent) Trifluralin (1.5 L/ha) + Diuron 900 (high rate) (pre-emergent) Trifluralin (1.5 L/ha) + Avadex (Tri-allate) (1.6 L/ha) (pre-emergent) Trifluralin (1.5 L/ha) (pre) + Monza (sulfosulfuron) (25 g/ha) (post) Monza (sulfosulfuron) 25 g (pre-emergent) Sakura (118 g) (pre-emergent) Monza (sulfosulfuron) (25 g) + Sakura (118 g) (pre-emergent) Sakura (118 g)+ Avadex (Tri-allate) 3 L (pre-emergent) Boxer Gold (2.5 L/ha) (pre-emergent) Boxer Gold (2.5 L/ha) (post) Sakura (118g)+ Avadex (Tri-allate) 3 L (pre-emergent) + Boxer Gold 2.5 L (post) |
# |
Treatment 1
|
Income less chemical cost ($/ha) | Yield (t/ha) | Early in-crop barley grass 24 July (plants/m2) | Late barley grass 26 Oct (plants/m2) | Chemical cost ($/ha) | Dry matter (t/ha) | Crop Establishment (plants/m2) | Average medic growth ((0-3) rating) |
---|---|---|---|---|---|---|---|---|---|
1 | █ Control Untreated | 391 | 1.55 | 7.3 | 11.1 | 0 | 0.23 | 102 | 1.5 |
2 | █ Trifluralin (1.5 L/ha) | 402 | 1.63 | 4.6 | 8.8 | 9 | 0.2 | 98 | 1.4 |
3 | █ Trifluralin (2 L/ha) | 386 | 1.58 | 2 | 8 | 12 | 0.21 | 99 | 1.1 |
4 | █ Trifluralin (1.5 L/ha) + Lexone (Metribuzin) 180 g (post) | 399 | 1.64 | 5.3 | 11.7 | 15 | 0.2 | 98 | 0.3 |
5 | █ Trifluralin (1.5 L/ha) + Diuron 900 (400 g/ha) (pre-emergent) | 399 | 1.64 | 3.4 | 7.8 | 14 | 0.21 | 98 | 1 |
6 | █ Trifluralin (1.5 L/ha) + Diuron 900 (high rate) (pre-emergent | 402 | 1.67 | 3.5 | 5.7 | 19 | 0.24 | 102 | 1 |
7 | █ Trifluralin (1.5 L/ha) + Avadex (Tri-allate) (1.6 L/ha) (pre-emergent) | 388 | 1.64 | 2 | 8.3 | 25 | 0.23 | 95 | 1.2 |
8 | █ Trifluralin (1.5 L/ha) (pre) + Monza (sulfoslfuron) (25 g/ha) (post) | 384 | 1.66 | 3.3 | 7.1 | 35 | 0.21 | 101 | 0.2 |
9 | █ Monza (sulfosulfuron) 25 g (pre-emergent) | 390 | 1.65 | 5.3 | 2.8 | 26 | 0.2 | 98 | 0 |
10 | █ Sakura (118 g) (pre-emergent) | 373 | 1.64 | 2.5 | 1.8 | 40 | 0.17 | 96 | 0.8 |
11 | █ Monza (sulfosulfuron) (25 g) + Sakura (118 g) (pre-emergent) | 340 | 1.61 | 2.6 | 1 | 66 | 0.19 | 101 | 0 |
12 | █ Sakura (118 g) + Avadex (Tri-allate) 3 L (pre-emergent) | 343 | 1.64 | 1 | 0.5 | 70 | 0.22 | 96 | 0.8 |
13 | █ Boxer Gold (2.5 L/ha) (pre-emergent) | 364 | 1.59 | 4.1 | 9.7 | 37 | 0.21 | 97 | 0.9 |
14 | █ Boxer Gold (2.5 L/ha) (post) | 366 | 1.6 | 5.6 | 11.6 | 37 | 0.26 | 103 | 1.3 |
15 | █ Sakura (118 g) + Avadex (Tri-allate) 3 L (pre-emergent) + Boxer Gold 2.5 L (post) | 304 | 1.63 | 1.5 | 1 | 107 | 0.18 | 97 | 0.6 |
Rainfall avg ann (mm) | 325mm |
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Rainfall avg gsr (mm) | 241mm |
Rainfall trial total (mm) | 333mm |
Rainfall trial gsr (mm) | 258mm |
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.