Barley grass in a retained stubble system - farm demonstrations


Research organisatons
Funding source

Trial details

Researcher(s) Amanda Cook, Mark Klante (SARDI), Andy Bates (Bates Ag Consulting), Bruce Heddle, Wade Shepperd, Ian Richter, Brett McEvoy and John Kelsh (SARDI)
Year(s) 2014
Contributor Eyre Peninsula Agricultural Research Foundation
Trial location(s) Site 10, Minnipa Agricultural Centre, SA
Related trials
Barley grass in a retained stubble system - farm demonstrations locations

The GRDC Stubble project aims to improve farm profitability while retaining stubble in farming systems on upper Eyre Peninsula (EP). Weed control in stubble retained systems is an issue with reduced herbicide efficacy due to higher stubble loads especially for pre-emergence herbicides. Current farming practices have also changed weed behaviour with later germinating barley grass genotypes now being present in many paddocks on Minnipa Agricultural Centre (MAC) (B Fleet, EPFS Summary 2011, p 177). As a part of the stubble project several MAC farm demonstrations were undertaken in 2014 to address barley grass weed issues including later germinating types and barley grass resistance to Group A herbicides within the farming system. An integrated approach to weed management aimed at lowering the weed seed bank can make use of diverse techniques such as cultivation, stubble burning, in-crop competition using higher sowing rates and possibly row orientation. The seed bank of crop weeds can be reduced within the break phase by hay making, or green or brown manuring. Other techniques used effectively in WA with ryegrass and wild radish have been narrow windrows and chaff carts, however little research has been done on the effectiveness of these approaches with barley grass because of its early shedding of seeds before harvest. Project: EPF00001 Maintaining profitability in retained stubble systems - upper Eyre Peninsula.

Key messages

There were no differences in grass weed numbers in paddock N7/8 between cereal crop treatments imposed of Sakura, East West and North South sowing, cross sowing and ‘15 cm nudge’.

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 N/A
Other trial partners Not specified
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Crop type Wheat
Treatment type(s)
  • Herbicide: Type
  • Sowing: Method
Trial type Demonstration
Trial design Unreplicated

Minnipa Agricultural Centre 2014

Sow rate or Target density 60kg/ha
Sow date 16 May 2014
Harvest date Not specified
Plot size Not specified
Plot replication Not specified

18:20:00:0 @ 60kg/ha


The whole paddock was sprayed on the 3 March with Roundup Attack @ 1 L/ha + Ester 680 @ 300 ml/ha + Striker @ 100 ml/ha. The whole paddock was sprayed again on 4 May with Roundup Powermax @ 1 L/ha + Ester 680 @ 350 ml + Striker @100 ml/ha. The Sakura treatment: sprayed 15 May with Sprayseed 250 @ 1 L/ha + Sakura @ 118 g/ha and incorporated as per label rate. Not prickle chained as per label.





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Download results

Trial results Table 1

# Variety
Treatment 1
Weeds (plants/m2) Grain yield (t/ha)
1 Wheat:Wyalkatchem Sakura 0.6 2.5
2 Wheat:Wyalkatchem East west sowing 3.5 2.5
3 Wheat:Wyalkatchem Cross sown 2.4 2.5
4 Wheat:Wyalkatchem 15cm nugde 8.2 2.5
5 Wheat:Wyalkatchem North south sowing 1.32 2.5

Grain yield t/ha


Weeds plants/m2

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 10, Minnipa Agricultural Centre, SA Red loam
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 10, Minnipa Agricultural Centre, SA Calcarosol
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



Derived climate information

No observed climate data available for this trial.
Derived climate data is determined from trial site location and national weather sources.

Site 10, Minnipa Agricultural Centre SA


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

SILO weather estimates sourced from
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: 23-07-2019 14:43pm AEST