Researcher(s) |
Nick Poole Darcy Warren |
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Year(s) | 2020 |
Contributor | Field Applied Research (FAR) Australia |
Trial location(s) |
Gnarwarre, VIC
|
To assess the value of PGRs with delayed harvest in HRZ regions.
RGT Planet achieved a grain yield of 8.3 t/ha significantly higher than the winter cultivar Cassiopee at 8.0 t/ha when harvested on time.
Untreated (without PGR) and harvested on time achieved an average yield of 7.89t/ha and delaying harvest by three weeks yielded 0.47t/ha less at 7.42t/ha due to headloss. PGR’s increased yield on average irrespective of harvest date and enable growers more time to manage harvest logistics with limited downside risk. The two-spray strategy of a PGR at G31 followed by a second application at GS37 – 49 yielded significantly higher at 8.32t/ha when harvested on time, and did not suffer a yield penalty when harvest three weeks later.
Irrespective of harvest date the PGR had the largest effect in Cassiopee and the use of a single PGR at GS31 increased yield by 0.5t/ha compared to untreated. This application benefit was primarily due to reducing lodging, the addition of a second application at GS37 did not further increase yield, however when the GS31 application was combined with a later application at GS49 yield increased 1.45t/ha due to the added head loss control.
There wasn’t any significant yield difference across all treatments in RGT Planet relative to the untreated control. While there was consistently 5 – 10 heads/m2 on the ground from delaying harvest in RGT Planet, these were not enough to influence yield.
The pressure on head loss was less at this site in 2020 compared to other hyper yielding centers highlights under moderate head loss pressure RGT planet is unlikely to benefit from PGR applications while winter cultivars will require them.
These results require further validation in 2021 but have demonstrated there is little downside risk with the use of PGRs in the higher rainfall zone. This works well for farm logistics and the timings of a PGR application at GS31 and later application could also be combined with the most effective fungicide timings.
Rotation position: 1st cereal following canola
Soil Type: Grey clay loam
Lead research organisation |
Field Applied Research (FAR) Australia |
---|---|
Host research organisation | N/A |
Trial funding source | GRDC FAR2004-002SAX |
Related program |
FAR Hyper Yielding Crops 2020-2022 |
Acknowledgments | N/A |
Other trial partners | Not specified |
Crop type | Cereal (Grain): Barley |
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Treatment type(s) |
|
Trial type | Experimental |
Trial design | Randomised,Replicated,Blocked |
Sow rate or Target density | 200 seeds/m2 |
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Sow date | 25 April 2020 |
Harvest date | 14-15 December, 2020 |
Plot size | Not specified |
Plot replication | Not specified |
Psuedoreplication | Not specified |
Fertiliser |
Sowing Fertiliser: 100kg/ha MAP Nitrogen: 23 June - 69 N kg/ha |
Fungicide |
17 August : Prosaro 300ml/ha |
Seed treatment | Vibrance & Gaucho |
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.