| Researcher(s) |
Nicole Dimos (SPAA) Felicity Turner (Vision Ag) Grant Yates (Vision Ag) |
|---|---|
| Year(s) | 2011 |
| Contributor | Society of Precision Agriculture Australia |
| Trial location(s) |
Tintinara, SA
|
To compare the effects of variable rate nitrogen applications on wheat yield across diverse soil types.
There was no response shown to varying nitrogen rates across the 4 yield zones on this paddock. This could be due to the adequate levels of nitrogen present before seeding as show in the 0-10 and 10-60cm soil test results and also reinforced with the NDVI esults, this would stem from good fertiliser history and rotation from the Harkness’s.This could give confidence that rates could be reduced on the lower yielding areas without risk of impacting on yield and consequently increasing gross margins across the paddock by saving wasted inputs on poorer performing soil types and leaving rates higher on better performing areas to maximise returns when seasons are more favourable.
| Lead research organisation |
Society of Precision Agriculture Australia |
|---|---|
| Host research organisation | N/A |
| Trial funding source | GRDC SPA000010 |
| Related program | N/A |
| Acknowledgments |
This project was funded by the Grains Research and Development Corporation (GRDC) |
| Other trial partners | Harkness family (Property owners) |
| Crop type | Cereal (Grain): Wheat |
|---|---|
| Treatment type(s) |
|
| Trial type | Precision agriculture |
| Trial design | Not applicable |
| Sow rate or Target density | 92 kg/ha |
|---|---|
| Sow date | 7 June 2011 7 June 2011 |
| Harvest date | Not specified |
| Plot size | Not specified |
| Plot replication | Not specified |
| Fertiliser |
DAP 80kg/ha 7 June 2011. Urea @ 20, 60 and 100kg/ha 10 August 2011 |
| # |
Treatment 1
|
Treatment 2
|
Grain yield (t/ha) |
|---|---|---|---|
| 1 | █ Low yield zone (sand) | █ Low N @ 20kg/ha | 2.68 |
| 2 | █ Low yield zone (gravel) | █ Low N @ 20kg/ha | 2.81 |
| 3 | █ Medium yield zone | █ Low N @ 20kg/ha | 3.51 |
| 4 | █ High yield zone | █ Low N @ 20kg/ha | 4.04 |
| 5 | █ Low yield zone (sand) | █ Medium N @ 60 kg/ha | 2.56 |
| 6 | █ Low yield zone (gravel) | █ Medium N @ 60 kg/ha | 2.71 |
| 7 | █ Medium yield zone | █ Medium N @ 60 kg/ha | 3.6 |
| 8 | █ High yield zone | █ Medium N @ 60 kg/ha | 4.04 |
| 9 | █ Low yield zone (sand) | █ High N @ 100 kg/ha | 2.61 |
| 10 | █ Low yield zone (gravel) | █ High N @ 100 kg/ha | 2.82 |
| 11 | █ Medium yield zone | █ High N @ 100 kg/ha | 3.58 |
| 12 | █ High yield zone | █ High N @ 100 kg/ha | 4.03 |
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.
