HYC Spring wheat “Reset” Trial

2020

Research organisaton
Funding source

Trial details

Researcher(s) Nick Poole
Darcy Warren
Year(s) 2020
Contributor Field Applied Research (FAR) Australia
Trial location(s) Gnarwarre, VIC
HYC Spring wheat “Reset” Trial locations
Aims

To assess the value of pre and post GS30 defoliation in winter and spring germplasm grown in HRZ regions of different season lengths

Individual objectives specific to the trial were:
- Assess the dry matter offtake differences resulting from GS22, GS30 & GS32 defoliations and their effect on final harvest dry matter, grain yield and harvest index of spring versus winter wheat.
- Assess whether April sown spring wheat that has been “reset at GS32 (defoliated)” is higher yielding than GS30 and GS22 grazed and ungrazed crops.
- To assess whether the dry matter offtakes of longer season winter wheats at GS22 are more profitable (dry matter offtake and grain yield) than the same winter wheat defoliated at GS30

Key messages

• All defoliation treatments reduced grain yield relative to the ungrazed crop except the “light graze” GS30 treatment in Trojan and the tillering defoliation (GS23) in RGT Accroc.
• Those defoliation treatments that removed larger amounts of dry matter at stem elongation (GS30-32) invariably reduced grain yield more.
• The concept of resetting Trojan at GS32 was unsuccessful in maintaining or increasing yield from a late April sow date. In addition, the undefoliated crop was not affected by frost.
• In Trojan both “light grazing” and “hard grazing” did not reduce yield with all treatments showing canopy compensation by flowering when assessed by canopy reflectance.
• With Trojan at 25 cents/kg dry matter and $300/t for grain the light grazing was the only treatment to produce a similar margin to the ungrazed control.
• In RGT Accroc where grazing was later than planned (and past the cut off of GS30) GS31 defoliation produced large dry matter offtakes and large reductions in grain yield but at the prices chosen would have been more profitable than the ungrazed control.
• The most profitable crop was the RGT Accroc defoliated at the end of tillering (GS29) which gave yields equal to the ungrazed and 3200 kg/ha dry matter removed.

Gnarwarre VIC 2020

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
Download the trial report to view additional trial information

Method

Crop type Cereal (Grain): Wheat
Treatment type(s)
  • Crop: Variety
  • Grazing: Timing
  • Grazing: Type
  • Management systems: Canopy Management
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Gnarwarre 2020

Sow rate or Target density 180 seeds/m2
Sow date 25 April 2020
Harvest date 31 December 2020 – 8 January 2021
Plot size Not specified
Plot replication Not specified
Fertiliser

Sowing Fertiliser: 100kg/ha MAP

Nitrogen: 23 June- 69 N kg/ha

7 August- 69 N kg/ha

Fungicide

GS31- Opus 500ml/ha

GS39- Radial 840ml/ha
GS61- Prosaro 300ml/ha

Seed treatment Vibrance & Gaucho
Other trial notes

The concept of “resetting” is specifically designed for early sowing spring wheat that develops too quickly from earlier sowing than would be recommended, in this case mid-April. The idea is that defoliation later than GS31 specifically removes advanced main stems that would have been frosted due to their very early development. Please note this is an experimental approach and should not yet be applied to commercial acreage.

Download the trial report to view additional method/treatment information
Trial source data and summary not available
Check the trial report PDF for trial results.
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Gnarwarre, VIC Grey clay loam
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Gnarwarre, VIC Sodosol
National soil grid Source: CSIRO/TERN
NOTE: National Soil Grid data is aggregated information for background information on the wider area
Actual soil values can vary significantly in a small area and the trial soil tests are the most relevant data where available

Soil properties

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Climate

Derived climate information

No observed climate data available for this trial.
Derived climate data is determined from trial site location and national weather sources.

Gnarwarre VIC

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Some data on this site is sourced from the Bureau of Meteorology

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.

Trial report and links

2020 trial report



Trial last modified: 21-04-2023 11:16am AEST