Monitoring the performance of nitrogen application to wheat under full stubble retention

2016

Research organisaton
Funding source

Trial details

Researcher(s) Nick Poole, Michael Straight (FAR Australia) in conjunction with Riverine Plains Inc
Year(s) 2016
Contributor Riverine Plains
Trial location(s) Site 1, Corowa, NSW
Site 2, Dookie, VIC
Monitoring the performance of nitrogen application to wheat under full stubble retention locations
Aims

To monitor the performance of nitrogen application to wheat under full stubble retention.

Key messages
  • At both Corowa, NSW and Dookie, Victoria, there were significant yield responses to applied nitrogen (N), with maximum yields of 6.25t/ha at Corowa and 6.21t/ha at Dookie.
  • Both sites gave identical unfertilised yields, averaging 4.67t/ha.
  • Yield responses were associated with significantly higher dry matter (DM) production and greater nitrogen offtake when 120kg N/ha was applied at both sites.
  • The maximum nitrogen offtake in the unfertilised crops at both sites equated to about 70–80kg N/ha, which was similar to the 95kg N/ha available to the crop at the start of the season at Corowa and the 65kg N/ha available at the start of the season at Dookie.
  • The normalised difference vegetation index (NDVI) response index (NDVI of fertilised:NDVI of unfertilised plots equal to 1.17) was measured at third node stage (GS33) and equated to maximum measured yield responses of 1.5–1.6t/ha to applied nitrogen.
  • Applying an extra 60kg N/ha on top of the initial 60kg N/ha at Corowa (total 120kg N/ha) produced an average yield increase of 0.17t/ha (maximum 0.25t/ha), which was not cost effective (data not shown).
  • At Dookie in 2016 applying 120kg N/ha gave greater returns and was economically worthwhile based on an extra 0.64t/ha for the additional 60kg N/ha applied (data not shown).
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

The 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.
Thank you the farmer co-operators, Mark Harmer, Dookie, Victoria and Denis Tomlinson, Corowa, NSW.


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

Method

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

Corowa 2016

Sow date 2 May 2016
Harvest date 10 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

Corowa 2016

Sow date 2 May 2016
Harvest date 10 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

Dookie 2016

Sow date 20 May 2016
Harvest date 13 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

Dookie 2016

Sow date 20 May 2016
Harvest date 13 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 application rate on grain and plant growth parameters at Corowa in 2016

@T1: @T2: @T3: @T4: @T5: @T6: @T7:
# Treatment 1
Cereal tillers (tillers/m2) Protein (%) Crop height (cm) Grain yield (t/ha) Nitrogen offtake in grain (kgN/ha) Head abundance (heads/m2) Screenings (%) Test weight (kg/hL) NDVI (.) Dry matter (t/ha) Nitrogen uptake (kg N/ha) Dry matter (t/ha) Nitrogen uptake (kg N/ha) NDVI (.) NDVI (.) Dry matter (t/ha) Nitrogen uptake (kg N/ha) Dry matter (t/ha) Nitrogen uptake (kg N/ha) NDVI (.) NDVI (.) Dry matter (t/ha) Nitrogen uptake (kg N/ha)
1 Nitrogen (0kg/ha) 327 8.6 89 4.67 70 311 1.7 81.6 0.471 0.8 45 1.6 54.9 0.561 0.639 3.8 69 10.2 126.7 0.596 0.264 12.5 64.6
1 Nitrogen (60kg/ha) 463 10 92 5.77 101 334 2.3 80.4 0.479 1.7 59.9 0.583 0.738 3.9 88.3 10.6 119.8 0.7 0.325 14.2 97.6
1 Nitrogen (120kg/ha) 498 11.7 90 5.94 122 312 1.9 80.2 0.476 1.8 73.3 0.59 0.747 3.8 103.4 10.3 149.1 0.75 0.38 12.6 92.3
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Grain yield t/ha


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Cereal tillers tillers/m2


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Crop height cm


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Dry matter t/ha


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Head abundance heads/m2


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NDVI .


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Nitrogen offtake in grain kgN/ha


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Nitrogen uptake kg N/ha


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Protein %


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Screenings %


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Test weight kg/hL


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Trial results Effect of nitrogen application timing on grain and plant growth parameters at Corowa in 2016

@T1: @T2: @T3: @T4: @T5:
# Crop height (cm) Protein (%) Grain yield (t/ha) Nitrogen offtake in grain (kgN/ha) Head abundance (heads/m2) Screenings (%) Test weight (kg/hL) Cereal tillers (tillers/m2) Dry matter (t/ha) NDVI (.) Nitrogen uptake (kg N/ha) Nitrogen uptake (kg N/ha) Dry matter (t/ha) NDVI (.) Dry matter (t/ha) NDVI (.) Nitrogen uptake (kg N/ha) Nitrogen uptake (kg N/ha) Dry matter (t/ha) NDVI (.)
1 Nitrogen GS24 and GS31 90 10 5.63 100 322 2 80.8 429 0.8 0.476 45 63 1.7 0.598 3.9 0.721 97.4 133.1 10.4 0.325
1 Nitrogen GS31 and GS33 90 10.2 5.29 95 309 2 80.6 430 0.475 0.558 3.7 0.695 76.4 130.5 10.3 0.321
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Grain yield t/ha


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Cereal tillers tillers/m2


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Crop height cm


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Dry matter t/ha


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Head abundance heads/m2


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NDVI .


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Nitrogen offtake in grain kgN/ha


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Nitrogen uptake kg N/ha


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Protein %


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Screenings %


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Test weight kg/hL


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Trial results Effect of nitrogen application rate on grain and plant growth parameters at Dookie in 2016

@T1: @T2: @T3: @T4: @T5:
# Nitrogen offtake in grain (kgN/ha) Protein (%) Grain yield (t/ha) Head abundance (heads/m2) Crop height (cm) Screenings (%) Test weight (kg/hL) Cereal tillers (tillers/m2) Dry matter (t/ha) Nitrogen uptake (kg N/ha) NDVI (.) Dry matter (t/ha) Nitrogen uptake (kg N/ha) NDVI (.) Dry matter (t/ha) Nitrogen uptake (kg N/ha) NDVI (.) NDVI (.) Dry matter (t/ha) Nitrogen uptake (kg N/ha) Dry matter (t/ha) Nitrogen uptake (kg N/ha)
1 Nitrogen (0kgN/ha) 80 9.7 4.67 277 89 0.6 80.5 334 0.4 21 0.44 1.9 57 0.54 4.7 81 0.72 0.66 9.1 91 11.5 60
1 Nitrogen (60kgN/ha) 96 10.3 5.32 320 91 0.6 81 359 0.6 32 0.48 2.1 80 0.61 5.3 115 0.74 0.7 9.4 91 14.1 54
1 Nitrogen (120kgN/ha) 108 10.4 5.96 338 91 0.7 81.2 381 0.6 37 0.46 2.3 92 0.63 5.2 125 0.76 0.72 9.9 116 15.3 85
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Grain yield t/ha


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Cereal tillers tillers/m2


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Crop height cm


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Dry matter t/ha


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Head abundance heads/m2


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NDVI .


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Nitrogen offtake in grain kgN/ha


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Nitrogen uptake kg N/ha


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Protein %


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Screenings %


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Test weight kg/hL


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Trial results Effect of nitrogen application timing on grain and plant growth parameters at Dookie in 2016

@T1: @T2: @T3: @T4: @T5:
# Protein (%) Grain yield (t/ha) Nitrogen offtake in grain (kgN/ha) Crop height (cm) Head abundance (heads/m2) Screenings (%) Cereal tillers (tillers/m2) Test weight (kg/hL) Nitrogen uptake (kg N/ha) Dry matter (t/ha) Nitrogen uptake (kg N/ha) Dry matter (t/ha) Nitrogen uptake (kg N/ha) Dry matter (t/ha) Dry matter (t/ha) Nitrogen uptake (kg N/ha) Dry matter (t/ha) Nitrogen uptake (kg N/ha)
1 Nitrogen applied at GS13 and GS30 10.2 5.18 93 91 302 0.6 354 80.9 30 0.5 79 2.1 105 5 9.5 90 13.6 71
1 Nitrogen applied at GS30 and GS33 10.1 5.45 97 90 322 0.7 361 80.9 73 2 110 5.1 9.4 109 13.7 61
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Grain yield t/ha


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Cereal tillers tillers/m2


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Crop height cm


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Dry matter t/ha


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Head abundance heads/m2


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Nitrogen offtake in grain kgN/ha


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Nitrogen uptake kg N/ha


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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 1, Corowa, NSW Not specified
Site 2, Dookie, VIC Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 1, Corowa, NSW Sodosol
Site 2, Dookie, 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 1, Corowa NSW 2016


Observed climate information

Rainfall trial gsr (mm) 567mm

Site 1, Corowa NSW 2016


Observed climate information

Rainfall trial gsr (mm) 567mm

Site 2, Dookie VIC 2016


Observed climate information

Rainfall trial gsr (mm) 509mm

Site 2, Dookie VIC 2016


Observed climate information

Rainfall trial gsr (mm) 509mm

Derived climate information

Site 1, Corowa VIC

Site 2, Dookie VIC

Site 1, Corowa VIC

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Site 2, Dookie 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 11:25am AEST