The GRDC project ‘Maintaining profitable farming systems with retained stubble - upper Eyre Peninsula’ aims to produce sustainable management guidelines to control pests, weeds and diseases while retaining stubble to maintain or improve soil health, and reduce exposure to wind erosion. The major outcome to be achieved is increased knowledge and skills allowing farmers and advisers to improve farm profitability while retaining stubble in farming systems on upper Eyre Peninsula (EP).
The Minnipa Agricultural Centre (MAC) S7 stubble retention trial was established to maintain or improve crop production through applying alternative weed, disease and pest control options in pasture wheat rotations in the presence of crop residues. The trial was established in 2013 with wheat and different stubble treatments imposed at harvest annually. It was sown either inter row or on row with wheat in 2014 and 2015 to determine the impacts of stubble management on crop production, weeds, disease and pests in low rainfall farming systems.
There were no differences in wheat yield at Minnipa in response to stubble architecture, seeding position and nitrogen treatments in 2015.
In 2015 plant establishment was reduced with cultivation and the addition of nitrogen at seeding compared to standing stubble cut low at harvest. The extra nitrogen applied at seeding also reduced the early dry matter.
Removing and cutting stubble low decreased the Yellow Leaf Spot disease incidence and snail numbers compared to high cut stubble.
Stubble management and seeding position had little effect on grass weed numbers.
Overall at Minnipa, stubble management and seeding position have not impacted highly on crop production, weeds, disease and pests over two years with relatively high stubble loads in low rainfall farming systems.
Lead research organisation
Eyre Peninsula Agricultural Research Foundation
Host research organisation
SARDI Minnipa Agricultural Centre
Trial funding source
Maintaining profitable farming systems with retained stubble
Thank you to Sue Budarick for processing samples. Trial funded by GRDC Maintaining profitable farming systems with retained stubble - upper Eyre Peninsula (EPF00001).
<p>DAP @ 60 kg/ha</p>
<p>All plots were split with urea being added to one half at 40 kg/ha applied at seeding. This rate was estimated to match estimated annual nitrogen tie up with the retained stubble loads. Since 5.8 kg N is required per tonne of stubble to break it down (Kirby et al. 2004), for 3.5 t/ha of wheat stubble approximately 20 kg N is required, or may have been tied up due to the stubble being present in the retained stubble treatments. An extra 20 kg/ha of urea was spread on all plots on 9 June 2015. The decision to add extra nitrogen as a split treatment was made after reviewing the 2014 season results</p>
<p>1.2 L/ha Roundup Attack and 2.5 L/ha Boxer Gold on 12 May. 750 ml/ha Tigrex and 100 ml/ha Lontrel on 23 July</p>
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.
Amanda Cook, Wade Shepperd and Ian Ricther (SARDI)
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