| Researcher(s) |
Sam Cockayne (SFS) Jon Midwood (SFS) Gary Sheppard (SFS) Mark Steele (SFS) Rohan Wardle (SFS) |
|---|---|
| Year(s) | 2008 |
| Contributor | Southern Farming Systems |
| Trial location(s) |
Dunkeld, VIC
|
This trial compared 10 different nitrogen strategies consisting of a number products, rates and timings to determine the optimal strategy
for the site and season.
In 2008, the optimal strategy for yield was the spilt application treatment of 40kgN/ha (urea) at GS33 and 40kgN/ha (urea) at GS39, which yielded 5.96t/ha. However, the optimal strategy for profitability was the single application treatment of 40kgN/ha (urea) at GS33, which returned a profit on investment of 15% or $10.76/ha. Therefore, it is questionable whether it was worth applying any nitrogen at all in this particular case, as the profit is marginal compared addition risk and outlay. Growers should be aiming for at least a 50% profit on investment, if not higher. As a result, the untreated nitrogen strategy appears the most rational decision given the 2008 scenario.
| Lead research organisation | N/A |
|---|---|
| Host research organisation | N/A |
| Related program | N/A |
| Acknowledgments |
Thanks to Doug MacArthur for providing the land for this trials programme. |
| Other trial partners | Not specified |
| Crop type | Cereal (Grain): Wheat |
|---|---|
| Treatment type(s) |
|
| Trial type | Experimental |
| Trial design | Randomised,Replicated,Blocked |
| Sow date | 23 May 2008 |
|---|---|
| Harvest date | 6 January 2009 |
| Plot size | 13m x 1.45m |
| Plot replication | Not specified |
| # | Variety |
Treatment 1
|
Protein (%) | Screenings (%) | Grain yield (t/ha) | Test weight (kg/hL) |
|---|---|---|---|---|---|---|
| 1 | █ Bolac | █ Control (Nil N) | 11.5 | 6.5 | 5.41 | 76.2 |
| 2 | █ Bolac | █ 80 N urea @ GS33; 40 N UAN @ 39 | 13.2 | 9 | 5.58 | 73.9 |
| 3 | █ Bolac | █ 80 N urea @ GS 33; 40 N urea @ GS 39 | 12.5 | 5.8 | 5.79 | 76.1 |
| 4 | █ Bolac | █ 80 N urea @ GS 33 | 13.5 | 8.3 | 5.37 | 74.2 |
| 5 | █ Bolac | █ 40N urea @ GS33; 80 N urea @ GS39 | 12 | 6.5 | 5.74 | 76.2 |
| 6 | █ Bolac | █ 40N urea @ GS33; 40N urea @ GS39 | 12.2 | 6.5 | 5.96 | 75.5 |
| 7 | █ Bolac | █ 40N urea @ GS33 | 11.6 | 5.8 | 5.71 | 75.9 |
| 8 | █ Bolac | █ 40N UAN @ GS33; 40N UAN @ GS39 | 12.4 | 7.8 | 5.09 | 75.3 |
| 9 | █ Bolac | █ 40N UAN @ GS33 | 11.9 | 8.4 | 5.61 | 75.1 |
| 10 | █ Bolac | █ 100 N urea @ GS33; 60N urea @ GS39 | 13 | 8.1 | 5.8 | 75 |
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
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16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.
