Peter Baines (P Baines Agronomy)
Jason Collier (Rand Fertilizers)
Nicole Dimos (SPAA)
John Sykes (Rural Consulting)
Leighton Wilksch (FSG)
|Contributor||Society of Precision Agriculture Australia|
To compare the effects of using variable rate N in crop on the yield of crops in the Rand area. To determine if N rich strips and satellite maps could be used to better determine the need for N in crop.
There was no visual response to applying N or yield. The N rich strips were also not obvious at the time of applying the N to the plots. This may have been a result of the moderate level of N in all zones, the dry spring and the time of application. From the DSN results, 20-60 kg/ha of N would have commended in August in the various zones to achieve the yield targets that were considered achievable at that time. The quality of the wheat produced was low (ASW due to low protein) indicating that insufficient N was applied. The economic analysis showed that the addition of N, lost money. The N rich strips were a useful guide to assessing that there would be no response to applying additional of N but not for assessing differing responses in different zones. It has not been possible to assess if satellite map were a useful guide to possible N response.
|Lead research organisation||
Society of Precision Agriculture Australia
|Host research organisation||N/A|
|Trial funding source||GRDC SPA000010|
|Other trial partners||Angus MacNeil (Property owner)|
|Trial type||Precision agriculture|
|Trial design||Not applicable|
|Sow rate or Target density||65 kg/ha|
|Sow date||18 May 2011 18 May 2011|
|Harvest date||Not specified|
|Plot size||Not specified|
|Plot replication||Not specified|
N rich stripe of 80 kg/ha of N (160 kg/ha of urea) was applie din late June across the site. • Rates of urea from 0 to 160 kg/ha (0-80 kg/ha of N) were applied in mid August just prior to growth stage Z31 of the wheat.
Glyphosate and Boxer gold
||Grain yield (t/ha)|
|1||█ At 0 kg/ha N (as urea)||2.9|
|2||█ At 20 kg/ha N (as urea)||2.8|
|3||█ At 40 kg/ha N (as urea)||3.1|
|4||█ At 80 kg/ha N (as urea)||3|
|5||█ N-Rich strip (80 kg/ha N) + 0 kg/ha N (as urea)||2.9|
|6||█ N-Rich strip (80 kg/ha N) + 20 kg/ha N (as urea)||2.6|
|7||█ N-Rich strip (80 kg/ha N) + 40 kg/ha N (as urea)||3.2|
|8||█ N-Rich strip (80 kg/ha N) + 80 kg/ha N (as urea)||2.9|
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.