Fabio Arsego (SARDI), Andrew Ware (SARDI)
|Contributor||SARDI Minnipa Agricultural Centre|
Site 6, Minnipa Agricultural Centre, SA
This research aims to determine whether adding extra nitrogen (N) at GS31 will bring benefits above the current standard practice of only applying nitrogen at or near sowing in three different Eyre Peninsula (EP) environments.
Every season, growers need to make choices over limited resources in order to maximise their profitability. Nitrogen and water represent two of the key limiting resources which set the grain yield potential of a paddock. The unpredictability of growing season rainfall patterns restricts in-season N applications for EP growers, due to the associated high economic risks. Therefore, less than optimum N rates are applied in many instances, and maximum grain yield gains and optimum protein contents are not reached on occasions where opportunities have existed. Understanding soil water and N dynamics can be useful to determine if extra N application at GS31 is worth the investment in EP dryland farming systems.
|Lead research organisation||
South Australian Research and Development Institute
|Host research organisation||N/A|
|Trial funding source||GRDC DAS00165|
The present project is part of the bi-lateral investment initiative between SARDI and GRDC (scope study DAS00165). Special thanks to Douglas Green, Ian Burrows and Jake Hull for providing their land for field trials in Cummins, Lock and Minnipa. Thank you to Brenton Spriggs, Sue Budarick and Katrina Brands for their collaboration with field activities.
|Other trial partners||Not specified|
|Sow rate or Target density||Scepter, Mace, Halberd and Spear|
|Sow date||22 May 2018|
|Harvest date||13 November 2018|
|Plot size||5 m x 1.6 m|
|Plot blocking||randomised complete block design|
|Plot randomisation||randomised complete block design|
|Paddock history||2017: Banker canola 2016: Buloke barley 2015: Wyalkatchem wheat|
86 kg/ha Triple Super Phosphate
Mineral N in control treatments were 74 kg/ha for Minnipa, 61 kg/ha for Lock and 44 kg/ha for Cummins. Rainfall from sowing up to harvest was 178 mm at Minnipa, 231 mm at Lock and 288 mm at Cummins.
Treatment applications were based on extra N (two applications of 60 kg/ha each of N as urea at emergence and GS31) and water (50 mm applied at the beginning of stem elongation).
Boxer gold 1.5 L/ha, Avadex® 1.5 L/ha, Treflan 1.7 L/ha, Round up 2 L/ha, Hammer 100 ml/ha, Sulphate Ammonia 800 g/ha
|Rainfall avg ann (mm)||325mm|
|Rainfall avg gsr (mm)||241mm|
|Rainfall trial total (mm)||269mm|
|Rainfall trial gsr (mm)||208mm|
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.