Ryegrass management in a retained stubble system - farm demonstration

2015

Research organisatons
Funding source

Trial details

Researcher(s) Amanda Cook, Andrew Ware, Wade Shepperd and Ian Richter (SARDI)
Year(s) 2015
Contributor Eyre Peninsula Agricultural Research Foundation
Trial location(s) Site 4, Yeelanna, SA
Ryegrass management in a retained stubble system - farm demonstration locations
Aims

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.

Key messages
  • Managing herbicide resistance in ryegrass continues to be crucial in maintaining sustainable crop production on Lower Eyre Peninsula.
  • Management strategies other than herbicides need to be deployed to ensure sustainable ryegrass control into the future.
  • Windrow burning proved to be an effective method in reducing ryegrass seed numbers in 2015.
  • Managing ryegrass on differing soil types will prove a challenge into the future.
  • Information generated by this project will provide data to simulate how different management strategies can be used to manage ryegrass in a sustainable, cost effective way.
Lead research organisation Eyre Peninsula Agricultural Research Foundation
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
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Method

Crop types Wheat
Canola
Faba beans
Barley
Treatment type(s)
  • Herbicide: Type
  • Stubble: Management
Trial type
Trial design

Yeelanna 2015 Wheat

Sowing machinery Not specified
Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Herbicide Not specified

Yeelanna 2015 Canola

Sowing machinery Not specified
Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Herbicide Not specified

Yeelanna 2015 Faba beans

Sowing machinery Not specified
Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Herbicide Not specified

Yeelanna 2015 Barley

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:

  • use of triazine tolerant canola (low amounts of Group C herbicides used in the past),
  • use of propyzamide pre-emergent (Group D) in canola,
  • use of clethodim (Group A),
  • using glyphosate under the windrower bar,
  • windrow burning and spraying at windrowing time in the canola crops,
  • later sowing of cereals in 2015 plus using Fathom barley as a competitive cr
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.

Paddock

2015

2014

2013

2012

2011

 

Crop

Rate L/ha, Chemical (Group)

Crop

Rate L/ha, Chemical (Group)

 

 

 

N5

TT canola

1.3 trifluralin (D), 1.7 atrazine (C), 1.0 propyzamide (D), post - 500 clemodim (A)

Scope barley

 

CL canola

Wheat

Wheat

Airstrip

Wheat

1.3 trifluralin (D), 2.0 triallate (E), 0.5 metolach (K), 0.3 diuron (C)  

CL canola

2.0 trifluralin (D), 1.0 propyzamide (D), 500 clemodim (A), 40 gm On Duty (B)

Wheat

Wheat

CL canola

80 Acre

Beans

1.0 terbyne (C),1.0 propyzamide (D)

Wheat

1.3 trifluralin (D), 2.5 Boxer Gold (K&J)

Wheat

CL canola

Wheat

Shearing Shed

Barley

1.3 trifluralin (D), 2.0 Boxer Gold (K& J) Post - 1.0 Boxer Gold (K)

TT canola

1.7 atrazine (C), 1.0 propyzamide, Post - 500 clemodim (A)

Wheat

Wheat

CL canola

West Well

Barley

1.3 trifluralin (D), 2.0 Boxer Gold (K&J) post - 1.0 Boxer Gold (K)

Wheat

1.3 trifluralin (D), 2.5 Boxer Gold (K& J)

Wheat

CL canola

Wheat

Salt Lake

TT canola

1.3 trifluralin (D), 1.7 atrazine (C), 1.0 propyzamide (D), Post 500 clemodim (A)

Wheat

1.3 trifluralin (D), 2.5 Boxer Gold (K&J)

CL canola

Wheat

Wheat

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Trial source data and summary not available
Check the trial report PDF for trial results.
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 4, Yeelanna, SA Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 4, Yeelanna, SA Sodosol
National soil grid Source
NOTE: National Soil Grid data is aggregated information for background information on the wider area
Actual soil values can vary significantly in a small area and the trial soil tests are the most relevant data where available

Soil properties

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Climate

Site 4, Yeelanna SA 2015


Observed climate information

Rainfall avg ann (mm) 395mm
Rainfall avg gsr (mm) 314mm
Rainfall trial total (mm) 358mm
Rainfall trial gsr (mm) 293mm

Derived climate information

Site 4, Yeelanna SA

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Some data on this site is sourced from the Bureau of Meteorology

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.




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Trial last modified: 06-08-2019 07:54am AEST