Evaluating nitrogen rates using precision agriculture


Research organisaton
Funding source

Trial details

Researcher(s) Nicole Dimos (SPAA), Anthony Hall (AgnVet Services Temora), Mitch Allen (FarmLink) and Paul Breust (FSG, FarmLink Research)
Year(s) 2011
Contributor Society of Precision Agriculture Australia
Trial location(s) Site 1, Coolamon , NSW
Evaluating nitrogen rates using precision agriculture locations

To investigate various rates of liquid and granular nitrogen on wheat protein using precision agriculture tools.

Key messages

The aim of the trial was to investigate the use of variable rate liquid & urea applications and their impacts on yield & grain protein. The liquid N application of 120l/ha achieved 2.8T/ha yield and increased protein to 13% which was $199/ha higher return than the 120kg/ha of Urea treatment. The 120kg/ha Urea treatment yielded 2.6t/ha and was graded as H2 because of a protein level of 12.6%. In this case it was economic to use the liquid N rate of 120l/ha. There were no other economic impacts from this trial work.

Lead research organisation Society of Precision Agriculture Australia
Host research organisation N/A
Trial funding source GRDC SPA000010
Related program N/A

This project was funded by the Grains Research and Development Corporation (GRDC)

Other trial partners  Bruce Holden (property owner)
Download the trial report to view additional trial information


Crop type Wheat
Treatment type(s)
  • Fertiliser: Type
Trial type Precision agriculture
Trial design Not applicable

Coolamon 2011

Sow rate or Target density 75 kg/ha
Sow date 20 May 2011 20 May 2011
Harvest date Not specified
Plot size Not specified
Plot replication Not specified

80kg/ha MAP + Impact


Logran @20g/ha + Roundup @ 1L/ha pre emergent


Fungicide to control Yr at Z39 

Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Treatment 1
Treatment 2
Screenings (%) Test weight (kg/hL) Protein (%) Moisture (%)
1 Liquid N 60 L/ha 3.7 77.5 12.3 11.5
2 Liquid N 90 L/ha 1.3 78.5 11.5 11.6
3 Liquid N 120 L/ha 4.3 77.5 13 11.6
4 Liquid N 150 L/ha 5.6 76.5 12.8 11.5
5 Urea 60 kg/ha 5.3 76 12.4 11.6
6 Urea 90 kg/ha 2.8 76 11.9 11.6
7 Urea 120 kg/ha 3.9 76.5 12.6 11.6

Moisture %


Protein %


Screenings %


Test weight kg/hL

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 1, Coolamon , NSW Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 1, Coolamon , NSW Kandosol
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



Derived climate information

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

Site 1, Coolamon NSW


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.

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Trial last modified: 20-09-2019 17:37pm AEST