Researcher(s) |
Amanda Cook (SARDI) Ian Richter (SARDI) Wade Shepperd (SARDI) Andrew Ware (SARDI) |
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Year(s) | 2015 |
Contributor | Eyre Peninsula Agricultural Research Foundation |
Trial location(s) |
Yeelanna, SA
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Ryegrass management is one of the key drivers of profitability in Lower Eyre Peninsula (LEP) cropping systems, and herbicides have recently been used as the main strategy for control. The intensification of cropping rotations and a decrease in livestock in farming systems has increased pressure on herbicides, resulting in the development of herbicide resistance. Other management strategies need to be assessed to manage ryegrass. The Australian Herbicide Resistance Initiative (ARHI) based at University of Western Australia developed the Ryegrass Integrated Management (RIM) model. This model enables growers and advisors to run various ryegrass management scenarios, with the model showing the cumulative effect on ryegrass numbers and profitability of the management strategies. This model can be accessed at ahri.uwa.edu.au/research/rim.
The GRDC ‘Maintaining profitable farming systems with retained stubble - upper Eyre Peninsula’ project has a focus on barley grass (Upper EP) and ryegrass (LEP). The research on this project has been undertaken by SARDI Minnipa Agricultural Centre staff. As part of this research a LEP farm was selected to monitor in-paddock ryegrass populations and weed management strategies. This research aims to ground-truth the effect (predicted by the RIM model) that various ryegrass management strategies have on ryegrass populations on a LEP farm with high ryegrass numbers and extend this information to EP growers and advisors to assist them in improving ryegrass management decisions using the RIM model.
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 |
A big thank you to Sue Budarick for establishing and managing the weed germination trays. This work has been funded by the EP Rail Levy and GRDC Maintaining profitability in retained stubble systems project - Upper Eyre Peninsula, EPF00001. |
Other trial partners | Not specified |
Crop types | Cereal (Grain): Wheat Oilseed: Canola Grain Legume: Faba beans Cereal (Grain): Barley |
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Treatment type(s) |
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Trial type | |
Trial design |
Sowing machinery | Not specified |
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Sow date | Not specified |
Harvest date | Not specified |
Plot size | Not specified |
Plot replication | Not specified |
Herbicide | Not specified |
Sowing machinery | Not specified |
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Sow date | Not specified |
Harvest date | Not specified |
Plot size | Not specified |
Plot replication | Not specified |
Herbicide | Not specified |
Sowing machinery | Not specified |
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Sow date | Not specified |
Harvest date | Not specified |
Plot size | Not specified |
Plot replication | Not specified |
Herbicide | Not specified |
Sowing machinery |
The six ryegrass populations were assessed across given paddock transects during the 2015 season, as well as crop plant numbers and herbicide resistance. The soil weed seed bank was assessed in 2015 as well, and this assessment will continue over the next 18 months in germination trays at Minnipa to determine the extent of seed dormancy.
The ryegrass management strategies which were implemented by the managers in 2015 include:
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Sow date | Not specified | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Harvest date | various | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Plot size | Not specified | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Plot replication | Not specified | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Herbicide |
Table 1 Paddock rotataion and chemical use in 2014 and 2015.
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Rainfall avg ann (mm) | 395mm |
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Rainfall avg gsr (mm) | 314mm |
Rainfall trial total (mm) | 358mm |
Rainfall trial gsr (mm) | 293mm |
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.