Researcher(s) |
Amanda Cook (SARDI) Ian Richter (SARDI) |
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Year(s) | 2016 |
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 dormancy in barley grass genotypes in many paddocks on Minnipa Agricultural Centre (MAC).
As a part of the stubble project this trial was undertaken to assess herbicide efficacy (effectiveness) in different stubble management systems. To understand how herbicides perform it is important to know the properties of the herbicide, the soil type and how the herbicide is broken down in the environment. The availability of a herbicide is an interaction between the solubility of a herbicide, how tightly it is bound to soil particles and organic matter, soil structure, cation exchange capacity and pH, herbicide volatility, soil water content and the rate of herbicide applied (EPFS Summary 2015, p132).
This article reports on the results of the second year of the trial, with a third year of the trial to be conducted in 2017.
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 Ben Fleet, Andy Bates, Nigel Wilhelm and Rick Llewellyn for help with this trial and to Sue Budarick, Tegan Watts, Lauren Cook and Katrina Brands for their help collecting and processing samples. 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) |
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Sow date | 30 May 2016 | ||||||||||||||||
Harvest date | 4 November 2016 | ||||||||||||||||
Plot size | 20m x 2m | ||||||||||||||||
Plot replication | 3 | ||||||||||||||||
Fertiliser |
DAP @ 60 kg/ha |
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Herbicide |
knockdown of 1.2 L/ha of Roundup Attack on 29 May
|
# |
Treatment 1
|
Yield (t/ha) | Crop Establishment (plants/m2) | Income less herbicide cost ($/ha) | Herbicide cost ($/ha) | Late dry matter (t/ha) | Early dry matter (t/ha) |
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1 | █ Control Untreated | 2.22 | 109 | 428 | 0 | 4.79 | 0.54 |
2 | █ Trifluralin (1.5 L/ha) | 2.23 | 92 | 421 | 9 | 4.8 | 0.35 |
3 | █ Trifluralin (2 L/ha) | 2.28 | 88 | 428 | 12 | 4.64 | 0.39 |
4 | █ Trifluralin (1.5 L/ha) + Lexone (Metribuzin) 180 g (post) | 2.26 | 107 | 421 | 15 | 4.71 | 0.44 |
5 | █ Trifluralin (1.5 L/ha) + Diuron 900 (400 g/ha) (pre-emergent | 2.21 | 102 | 413 | 14 | 4.61 | 0.45 |
6 | █ Trifluralin (1.5 L/ha) + Diuron 900 (high rate) (pre-emergent) | 2.28 | 91 | 421 | 19 | 4.22 | 0.36 |
7 | █ Trifluralin (1.5 L/ha) + Avadex (Tri-allate) (1.6 L/ha) (pre-emergent) | 2.16 | 76 | 392 | 25 | 4.3 | 0.26 |
8 | █ Trifluralin (1.5 L/ha) (pre) + Monza (sulfosulfuron) (25 g/ha) (post) | 2.24 | 95 | 397 | 35 | 4.83 | 0.44 |
9 | █ Monza (sulfosulfuron) 25 g (pre-emergent) | 2.17 | 101 | 393 | 26 | 4.43 | 0.37 |
10 | █ Sakura (118 g) (pre-emergent) | 2.21 | 96 | 387 | 40 | 4.21 | 0.33 |
11 | █ Monza (sulfosulfuron) (25 g) + Sakura (118 g) (pre-emergent) | 1.99 | 89 | 318 | 66 | 3.84 | 0.28 |
12 | █ Sakura (118 g) + Avadex (Tri-allate) 3 L (pre-emergent) | 2.2 | 97 | 355 | 70 | 4.03 | 0.36 |
13 | █ Boxer Gold (2.5 L/ha) (pre-emergent) | 2.29 | 97 | 405 | 37 | 4.82 | 0.45 |
14 | █ Boxer Gold (2.5 L/ha) (post) | 2.19 | 99 | 386 | 37 | 4.79 | 0.47 |
15 | █ Sakura (118 g) + Avadex (Tri-allate) 3 L (pre-emergent) + Boxer Gold 2.5 L (post) | 2.18 | 91 | 314 | 107 | 4.14 | 0.3 |
Rainfall avg ann (mm) | 325mm |
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Rainfall avg gsr (mm) | 241mm |
Rainfall trial total (mm) | 391mm |
Rainfall trial gsr (mm) | 268mm |
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.