| Researcher(s) |
Darren Chitty (Landmark) David Hurst (Landmark) |
|---|---|
| Year(s) | 2013 |
| Contributor | West Midlands Group |
| Trial location(s) |
Regans Ford, WA
|
To assess the use of banded slow release nitrogen in comparison to banded urea and best practice farmer practice.
The trial as a result of cockatoo damage experienced patchy emergence and has contributed to a higher LSD from the trial. While there is a larger LSD some conclusion can be drawn from the trial. It must also be noted that the price of the SRN has been assumed to be 1.5x greater than the cost of urea at $608/t. This assumption is only for comparison reasons only and is only an estimate.
This trial has demonstrated that SRN in leaching sands can be used as a banded product to improve N efficiency and improve yields. From graph 1 the N efficiency of the applied nitrogen N applications has been calculated. As expected the banded urea had the poorest N efficiency ranging from between 1.6-<14%. SRN and urea mixes banded had an N efficiency improvement over the banded urea, with top-dressed urea at Z25 ranging from between 42 and 50% nitrogen efficiency.
SRN and top-dressed nitrogen had the best N efficiency ranging between 47 and 50%. In the WMG area this year the dry June while not welcome did help to improve N efficiency, with N efficiency >50% rarely heard of on the gravel matrix sand and deep sands in medium/high rainfall years. So while the area experienced a relatively low N leaching year the SRN has still enabled a greater $ROI/Ha for each plot.
| Lead research organisation |
Landmark |
|---|---|
| Host research organisation |
West Midlands Group |
| Trial funding source | Land and Water Australia |
| Related program | N/A |
| Acknowledgments |
Landmark would like to thank the following people for supply the trial site. West Midlands Group Peter Negus |
| Other trial partners | Not specified |
| Crop type | Cereal (Grain): Wheat |
|---|---|
| Treatment type(s) |
|
| Trial type | Experimental |
| Trial design | Replicated |
| Sowing machinery |
Knife point and press wheel. |
|---|---|
| Sow date | 24 May 2013 |
| Harvest date | Not specified |
| Plot size | 1.8m x 20m |
| Plot replication | Not specified |
| Fertiliser |
A Basal application was applied at seeding of Muriate of Potash top- dressed 70kg/Ha, Macropro Plus (Banded) 75kg/Ha and Super SR (Banded) 75kg/Ha. This gave a basal application of nutrients that included: 7.5 kg/ha N, 17 kg/ha P, 41 kg/ha K and 13.5 kg/ha S |
| Herbicide |
- Farmer Knockdown prior to 24/05/2013 - 24/05/2013, Knockdown & Pre-em: Sakura 118g, Logran 35g, Treflan 2L/Ha, Sprayseed 2L/Ha. - 28/06/2013, Crusader0.5L/Ha, Trojan 30ml/Ha. - 04/07/2013, Z25 urea application. |
| Rainfall trial gsr (mm) | 340mm |
|---|
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.
