The interaction between plant growth regulator (PGR) and nitrogen application first wheat

2016

Research organisaton
Funding source

Trial details

Researcher(s) Nick Poole and Michael Straight (FAR Australia)
Year(s) 2016
Contributor Riverine Plains
Trial location(s) Site 3, Yarrawonga, VIC
The interaction between plant growth regulator (PGR) and nitrogen application first wheat locations
Aims

To investigate the interaction between plant growth regulator (PGR) and nitrogen application in early-sown first wheat.

Key messages
  • For a wheat crop with an average yield of 4.5–5t/ha, increasing the rate of nitrogen (N) applied (40 and 80 extra kilograms of nitrogen per hectare above the farm standard) significantly increased dry matter (DM) accumulation, crop height and final yield of first wheat following canola.
  • Applying a plant growth regulator (PGR) (Moddus + chlormequat) reduced crop height by 3cm and significantly decreased DM production.
  • A small, non-significant yield reduction was measured with PGR application, which was similar to that observed during 2014, when yields were in the 5–6t/ha range. Conversely, during 2015, there was a positive yield effect of 0.1t/ha, when average crop yield was approximately 3t/ha.
  • Although differences were small, the PGR application significantly increased screenings and decreased test weight, results that are not in line with the effects observed during 2015.
  • After three years of trials there is no evidence to suggest PGR application has delivered any positive yield effects or consistent quality effects.
  • In all three years of trials, PGR application showed a trend to reduce DM, which was significant in 2016.
Lead research organisation Riverine Plains
Host research organisation Riverine Plains
Trial funding source GRDC RPI00009
Related program Maintaining profitable farming systems with retained stubble
Acknowledgments

This trial was carried out as part of the Riverine Plains Inc GRDC funded project Maintaining Profitable Farming Systems with Retained Stubble in the Riverine Plains Region.

This trial was run at the Riverine Research Centre (RRC), an independent and dedicated crop research site located near Yarrawonga, Victoria. The RRC is a partnership between Riverine Plains Inc and FAR Australia and is supported by RRC hosts, the Cummins family.


Other trial partners FAR Australia
Download the trial report to view additional trial information

Method

Crop type Wheat
Treatment type(s)
  • Fertiliser: Timing
  • Growth regulator: Application
Trial type Experimental
Trial design Replicated

Yarrawonga 2016

Sow date 17 May 2016
Harvest date 11 December 2016
Plot size Not specified
Plot replication Not specified
Herbicide

host farmer paddock management

Insecticide

host farmer paddock management

Fungicide

host farmer paddock management

Yarrawonga 2016

Sow date 17 May 2016
Harvest date 11 December 2016
Plot size Not specified
Plot replication Not specified
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 treatments on wheat growth parameters at Yarrawonga in 2016

@T1: @T2: @T3: @T4: @T5:
# Treatment 1
Protein (%) Grain yield (t/ha) Harvest index (value) Screenings (%) Test weight (kg/hL) NDVI (.) NDVI (.) NDVI (.) Dry matter (t/ha) NDVI (.) Dry matter (t/ha) Dry matter (t/ha)
1 Standard (104kgN/ha) 7.3 4.21 40.3 2 79.4 0.64 0.694 0.774 3.97 0.694 6.29 10.37
1 Standard + 40kg N/ha 8.4 4.79 42.5 1.6 80.3 0.62 0.708 0.815 4.1 0.747 6.02 11.14
1 Standard + 80kgN/ha 8.9 5.15 41.5 2.1 79.6 0.632 0.748 0.836 4.15 0.777 7.03 12.23
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NDVI .


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Screenings %


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Test weight kg/hL


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Trial results Effect of growth regulator application on wheat growth parameters at Yarrawonga in 2016

@T1: @T2: @T3: @T4: @T5:
# Protein (%) Grain yield (t/ha) Harvest index (value) Screenings (%) Test weight (kg/hL) NDVI (.) NDVI (.) NDVI (.) Dry matter (t/ha) NDVI (.) Dry matter (t/ha) Dry matter (t/ha)
1 No Plant Growth Regulator 7.7 4.77 39.8 1.5 80.7 0.628 0.704 0.813 4.13 0.75 6.46 11.83
1 Moddus + chlomequat 8.6 4.67 43.1 2.3 78.8 0.633 0.73 0.804 4.02 0.728 6.44 10.67
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Grain yield t/ha


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Dry matter t/ha


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Harvest index value


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NDVI .


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Protein %


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Screenings %


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Test weight kg/hL


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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 2016


Observed climate information

Rainfall trial gsr (mm) 604mm

Site 3, Yarrawonga VIC 2016


Observed climate information

Rainfall trial gsr (mm) 604mm

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: 28-11-2019 13:04pm AEST