Amanda Cook, Mark Klante (SARDI), Andy Bates (Bates Ag Consulting), Bruce Heddle, Wade Shepperd, Ian Richter, Brett McEvoy and John Kelsh (SARDI)
|Contributor||Eyre Peninsula Agricultural Research Foundation|
Site 10, Minnipa Agricultural Centre, SA
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.
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|
Maintaining profitable farming systems with retained stubble
|Other trial partners||Not specified|
|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.
||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|
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.