| Researcher(s) |
Michael Bennet (SARDI) |
|---|---|
| Year(s) | 2009 |
| Contributor | Eyre Peninsula Agricultural Research Foundation |
| Trial location(s) |
Wanilla, SA
|
To compare four locally grown wheat varieties at district practice and high seeding rates to assess their influence on reducing the impact of ryegrass in the whole farming system.
| Lead research organisation |
Eyre Peninsula Agricultural Research Foundation |
|---|---|
| Host research organisation | N/A |
| Trial funding source | GRDC SA-EP-080906 |
| Trial funding source | Caring for our Country |
| Related program |
Eyre Peninsula Farming Systems |
| Acknowledgments |
|
| Other trial partners | SARDI/SANTFA |
| Crop type | Cereal (Grain): Wheat |
|---|---|
| Treatment type(s) |
|
| Trial type | Experimental |
| Trial design | Randomised,Replicated |
| Sow rate or Target density | sown at 180, 300 and 450 plants/m2 |
|---|---|
| Sowing machinery |
Cummins Landmark’s DBS plot seeder on 30 cm row spacing. |
| Sow date | 15 May 2009 |
| Harvest date | Crop-topped the paddock with glyphosate |
| Plot size | 10m x 1.5m |
| Plot replication | 4 |
| Rainfall avg ann (mm) | 490mm |
|---|---|
| Rainfall avg gsr (mm) | 396mm |
| Rainfall trial total (mm) | 511mm |
| Rainfall trial gsr (mm) | 383mm |
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.
| Event | Date | Type | Effect |
|---|---|---|---|
|
Waterlogging Throughout July and August the wheat was being suppressed by water logging, allowing the ryegrass to dominate the wheat. During this time 80 kg/ha urea was broadcast and 30 l/ha UAN sprayed to try and improve the N supply and the wheat competition.
In September the ryegrass had grown above the crop canopy to the point where there seemed little chance of continuing the trial due to potential ryegrass seed set. The grower decided to crop-top the paddock with glyphosate to reduce the contribution of 2009 seed to the ryegrass seed bank.
Due to the paddock being crop-topped with glyphosate, there was no opportunity to assess ryegrass seed set with actual viable seed. Instead samples of ryegrass were collected on 20 October. Potential seed set was assessed by counting the number of spikes (seed heads) per quadrat, then individually counting how many spikelets and seeds per spikelet were on 30 spikelets per plot. |
July-August 2009 | High rainfall | N/A |
