Interaction between plant growth regulator (PGR) and N application in early sown first wheat

2013

Research organisatons
Funding source

Trial details

Researcher(s) Nick Poole and Tracey Wylie (FAR Australia)
Year(s) 2013
Contributor Riverine Plains
Trial location(s) Site 3, Yarrawonga, VIC
Interaction between plant growth regulator (PGR) and N application in early sown first wheat locations
Aims

To evaluate the effect of plant growth regulator (PGR) appliaction in early-sown first wheat grown under different levels of nitrogen application.

Key messages
  • In a low-yielding situation at Coreen, Victoria (< 2.5t/ha) following a dry spring, plant growth regulator (PGR) application lead to a significatn yield reduction (0.14t/ha) in early-sown first wheat.
  • PGR application significantly reduced crop height in both trials, but did not reduce crop canopy biomass, suggesting that crop biomass was redistrubuted, not recuced.
  • The addition of extra nitrogen, over and above farm standard significantly increased grain protein but not yield
  • PGR application significantly reduced the normalised difference vegetative index readings taken with Greenseeker, particularly where applicaiton was superimposed on lower amount of applied nitrogen.
Lead research organisation Commonwealth Scientific and Industrial Research Organisation
Host research organisation N/A
Trial funding source GRDC
Related program Maintaining profitable farming systems with retained stubble
Acknowledgments

Thanks to the farmer co-operators, Telewonga Pty Ltd (Yarrawongs) and Tomlinson Ag (Coreen).


Other trial partners Not specified
Download the trial report to view additional trial information

Method

Crop type Wheat
Treatment type(s)
  • Fertiliser: Rate
Trial type Experimental
Trial design Replicated

Yarrawonga 2013

Sow date 4 April 2013
Harvest date Not specified
Plot size 18m x 3m
Plot replication 4
Herbicide

host farmer paddock management

Insecticide

host farmer paddock management

Fungicide

host farmer paddock management

Yarrawonga 2013

Sow date 29 April 2013
Harvest date Not specified
Plot size 15m x 3m
Plot replication 4
Herbicide

host farmer paddock management

Insecticide

host farmer paddock management

Fungicide

host farmer paddock management

Download the trial report to view additional method/treatment information

Download results

Trial results Effect of nitrogen rate on grain parameters at Yarrawonga 2013

# Treatment 1
Screenings (%) Hectolitre weight (kg/hL) Protein (%) Grain yield (t/ha)
1 Standard N (75kg/ha) 7.8 66.4 13.9 2.33
2 Standard + 40kg/ha N 8.1 66.2 14.9 2.33
3 Standard + 80kg/ha N 9.4 63.7 16.2 2.19

Grain yield t/ha


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Hectolitre weight kg/hL


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Protein %


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Screenings %


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Trial results Effect of PGR application on grain parameters at Yarrawonga 2013

# Screenings (%) Hectolitre weight (kg/hL) Protein (%) Grain yield (t/ha)
1 No PGR 8.7 64.3 15 2.35
2 PGR @ Z32 8.2 66.6 15 2.21

Grain yield t/ha


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Hectolitre weight kg/hL


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Protein %


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Screenings %


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Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 3, Yarrawonga, VIC Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 3, Yarrawonga, VIC Sodosol
National soil grid Source
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

Site 3, Yarrawonga VIC 2013


Observed climate information

Rainfall trial gsr (mm) 222mm

Site 3, Yarrawonga VIC 2013


Observed climate information

Rainfall trial gsr (mm) 222mm

Derived climate information

Site 3, Yarrawonga 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 last modified: 03-09-2019 09:23am AEST