| Researcher(s) |
Elliott Duncan |
|---|---|
| Year(s) | 2014 |
| Contributor | Liebe Group |
| Trial location(s) |
Wongan Hills, WA
|
To investigate how nutrient interactions influence yield response. Specifically, if:
At three field sites in WA, increased wheat yield was achieved at lower nitrogen (N) application rates when N was balanced with appropriate phosphorous (P), potassium (K) and sulphur (S) applications. Wheat yield was driven by the ratio of N to P and K rather than the absolute concentrations of the nutrients and it is possible to increase profit margins by balancing nutrient inputs.
The level of background nutrients present in the soil at sowing was a key factor in determining the responsiveness of yield to fertiliser applications and how profitable the fertiliser treatments were. Pre-season soil testing to determine the level of residual nutrients will allow growers to balance their nutrient inputs and help to maximise profits.
| Lead research organisation |
CSIRO - Plant Industry |
|---|---|
| Host research organisation | N/A |
| Related program | N/A |
| Acknowledgments |
Margaret Roper, Cathryn Sullivan and Kelley Whisson - CSIRO Agriculture Flagship, Floreat, WA Shari Dougall - DAFWA Wongan Hills Field Station Michael Blair and Rohan Hungerford - UWA Shenton Park Research Station Summit Fertilizers InterGrain |
| Other trial partners | Not specified |
| Crop type | Cereal (Grain): Wheat |
|---|---|
| Treatment type(s) |
|
| Trial type | Experimental |
| Trial design | Replicated |
| Sow rate or Target density | 80 kg/ha - Triticum aestivum C.V. Mace |
|---|---|
| Sow date | 28 May 2014 28 May 2014 |
| Harvest date | Not specified |
| Plot size | 1.54m x 10m |
| Plot replication | 3 |
| Fertiliser |
As per protocol: Urea (46% N); TSP (27% P); Muriate of Potash (52% K); Gypsum (14% S) (See table in report for further details of individual treatments) |
| Herbicide |
1.5 L/ha Roundup; 2 L/ha Spray.Seed250; 118 g/ha Sakura; 1% Hasten; 670 mL/ha Velocity |
| # | Variety |
Grain yield (t/ha) |
|---|---|---|
| 1 | █ Background | 1.83 |
| 2 | █ 10 kg N ha | 2.28 |
| 3 | █ 10 kg N ha + 2 kg P ha | 2.36 |
| 4 | █ 10 kg N ha + 8 kg K ha | 2.23 |
| 5 | █ 10 kg N ha + 3 kg S ha | 2.3 |
| 6 | █ 10 kg N ha + 2 kg P ha + 8 kg K ha + 3 kg S ha | 2.36 |
| 7 | █ 30 kg N ha | 2.33 |
| 8 | █ 30 kg N ha + 8 kg P ha | 2.41 |
| 9 | █ 30 kg N ha + 25 kg K ha | 2.38 |
| 10 | █ 30 kg N ha + 10 kg S ha | 2.29 |
| 11 | █ 30 kg N ha + 8 kg P ha + 25 kg K ha + 10 kg S ha | 2.43 |
| 12 | █ 60 kg N ha | 2.26 |
| 13 | █ 60 kg N ha + 16 kg P ha | 2.29 |
| 14 | █ 60 kg N ha + 50 kg K ha | 2.26 |
| 15 | █ 60 kg N ha + 20 kg S ha | 2.29 |
| 16 | █ 60 kg N ha + 16 kg P ha + 50 kg K ha + 20 kg S ha | 2.38 |
| 17 | █ 90 kg N ha | 2.34 |
| 18 | █ 90 kg N ha + 24 kg P ha | 2.35 |
| 19 | █ 90 kg N ha + 75 kg K ha | 2.34 |
| 20 | █ 90 kg N ha + 30 kg S ha | 2.4 |
| 21 | █ 90 kg N ha + 24 kg P ha + 75 kg K ha + 30 kg S ha | 2.28 |
| 22 | █ Site variability (SE) | 0.08 |
| Rainfall avg gsr (mm) | 172mm |
|---|
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.
