Soil type specific nitrogen responses

CC BY 4.0

Research organisaton
Funding source

Trial details

Researcher(s) Nicole Dimos (SPAA)
Michael Moodie (MSF)
Year(s) 2011
Contributor Society of Precision Agriculture Australia
Trial location(s) Mildura, VIC
Soil type specific nitrogen responses locations

To use PA maps to indentify and sample soil zones within a paddock. To identify potential soil specific nitrogen responses within paddocks

Key messages

Averaged across all sampling locations, protein levels increased by 0.6% in the 50kg/ha of urea treatment and by 1% in the 100kg/ha of urea treatment relative to the nil in-crop fertiliser strip. This increase in protein was enough to improve grain quality from Australian Standard White (ASW) to Australian Premium White (APW) at four of the six sampling locations. On the day of harvest at the nearest grain receiver site (Yelta), the ASW silo cash price was $127/t and APW was $158/t. At a urea cost of $620/t, the application of 50 kg/ha of urea costs $31/ha (fertiliser cost only). Therefore, at the four sites where grain quality was improved, a small profit was made (15 – 55 $/ha) with the application of 50 kg/ha of fertiliser. However, at one third of the protein sampling sites, a loss of $31/ha was incurred as there was no difference in grain quality between the treatments.

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 Colin and Chris Hunt (site hosts)
Download the trial report to view additional trial information


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

Mildura 2011

Sow rate or Target density 30 kg/ha
Sow date 2 May 2011 2 May 2011
Harvest date Not specified
Plot size Not specified
Plot replication Not specified

MAP 30-50 kg/ha VR. Nitrogen rich strips were applied to the focus paddock on 27 July 2011

Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Variety
Treatment 1
Treatment 2
Protein (%) Grain yield (t/ha)
1 Axe Sample Location 1 1.8
2 Axe Sample Location 2 1.7
3 Axe Sample Location 3 2.8
4 Axe Sample Location 4 1.3
5 Axe Sample Location 5 2.2
6 Axe Sample Location 6 1.5
7 Axe Sample Location 1 No fertiliser added 10.3
8 Axe Sample Location 2 No fertiliser added 10.2
9 Axe Sample Location 3 No fertiliser added 9.9
10 Axe Sample Location 4 No fertiliser added 9.1
11 Axe Sample Location 5 No fertiliser added 10.9
12 Axe Sample Location 6 No fertiliser added 9.4
13 Axe Sample Location 1 Urea @ 50 kg/ha 10.7
14 Axe Sample Location 2 Urea @ 50 kg/ha 10.8
15 Axe Sample Location 3 Urea @ 50 kg/ha 10.5
16 Axe Sample Location 4 Urea @ 50 kg/ha 10.1
17 Axe Sample Location 5 Urea @ 50 kg/ha 11
18 Axe Sample Location 6 Urea @ 50 kg/ha 10.5
19 Axe Sample Location 1 Urea @ 100 kg/ha 11.2
20 Axe Sample Location 2 Urea @ 100 kg/ha 11
21 Axe Sample Location 3 Urea @ 100 kg/ha 11
22 Axe Sample Location 4 Urea @ 100 kg/ha 10.4
23 Axe Sample Location 5 Urea @ 100 kg/ha 11.5
24 Axe Sample Location 6 Urea @ 100 kg/ha 10.9

Grain yield t/ha


Protein %

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Mildura, VIC Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Mildura, VIC Vertosol
Soil Moisture Source: BOM/ANU
Average amount of water stored in the soil profile during the year, estimated by the OzWALD model-data fusion system.
Year Mildura VIC
2011 441.2mm
2010 377.7mm
2009 299.7mm
2008 285.1mm
2007 312.2mm
2006 324.9mm
2005 345.6mm
2004 315.1mm
2003 315.3mm
2002 250.9mm
2001 301.5mm
2000 319.6mm
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



Derived climate information

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

Mildura VIC


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

SILO weather estimates sourced from
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: 30-09-2019 15:52pm AEST