Amanda Cook (SARDI), Chris Dyson (SARDI)
|Contributor||Eyre Peninsula Agricultural Research Foundation|
Site 23, Minnipa Agricultural Centre, SA
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 determine if we could 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 each season to determine the impacts of stubble management on crop production, weeds, disease and pests in low rainfall farming systems.
|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
Thank you to Sue Budarick, Tegan Watts and Katrina Brands for processing samples. Trial funded by GRDC Maintaining profitable farming systems with retained stubble - upper Eyre Peninsula (EPF00001).
|Other trial partners||Not specified|
|Sow rate or Target density||60kg/ha|
|Sow date||13 May 2016|
|Harvest date||3 November 2016|
|Plot size||18m x 2m|
DAP @ 60 kg/ha
all plots were split with urea being added to one half at 40 kg/ha applied at seeding. This rate was estimated to match annual nitrogen tie up with the retained stubble loads using 5.8 kg N required per tonne of stubble to break it down (Kirby et al. 2004). Another 40 kg/ha of urea was also spread on 21 July to the urea treatments only, since there was some nitrogen deficiency present due to the seasonal conditions.
The trial was sprayed on 13 May 2016 with a knockdown of 1.5 L/ha of trifluralin, 1.5 L/ha of glyphosate and 80 ml/ha of carfentrazone-ethyl. The trial was sprayed with 750 ml/ha of imazamix and imazapyr on 20 June.
|Rainfall avg ann (mm)||325mm|
|Rainfall avg gsr (mm)||242mm|
|Rainfall trial total (mm)||391mm|
|Rainfall trial gsr (mm)||268mm|
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.