Variable rate fertiliser NR and CR Kernik Coonalpyn/Field


Research organisaton
Funding source

Trial details

Researcher(s) Nicole Dimos (SPAA) and Felicity Turner (Vision Ag)
Year(s) 2010
Contributor Society of Precision Agriculture Australia
Trial location(s) Site 1, Coonalpyn , SA
Variable rate fertiliser NR and CR Kernik Coonalpyn/Field locations

To compare the effects and to demonstrate the economic benefits that may result from the use of variable rate fertiliser applications by broad acre farmer trial.

Key messages

The objective of this GRDC / SPAA funded project is to increase the level of adoption of PA 'beyond guidance' by broadacre farmers. The project specifically aims to increase the level of adoption of variable rate (VR) by growers in the project to 30% by 2013.This goal will be achieved by demonstrating how to use PA tools to growers at a regional level and by increasing the skills of growers and industry in PA to a level where they can then use PA tools in their farming systems to achieve economic, environmental and social benefits. Fertiliser rates were selected after discussing with farmer that the lower yielding zones would never produce yields comparable to medium and high yielding zones, due to the low fertility and poor water and nutrient holding capacity of the soil. The farmer believed that that fertiliser was being wasted on the sand zones of his farm, and wanted to see if cutting fertiliser rates would be detrimental to yield in this zone.

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 Not specified
Download the trial report to view additional trial information


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

Coonalpyn 2010

Sow rate or Target density 110kg/ha
Sowing machinery

70 ha plots

Sow date 23 May 2010 23 May 2010
Harvest date 10 January 2010
Plot size Not specified
Plot replication Not specified


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Download results

Trial results Table 1

# Treatment 1
Grain manganese (mg/kg) Grain copper (mg/kg) Grain yield (t/ha) Grain zinc (mg/kg)
1 Zone 1 (Low) - Rate 1 @ 40kg/ha DAP 21.07 2.87 0.481 23.63
2 Zone 1 (Low) Rate 2 @ 60kg/ha DAP 30.63 2.38 0.371 28.51
3 Zone 1 (Low) - Rate 3 @ 80kg/ha DAP 29.26 2.03 0.341 28.88
4 Zone 2 (Med) - Rate 1 @ 40kg/ha DAP 8.73 2.18 2.371 19.31
5 Zone 2 (Med) - Rate 2 @ 60kg/ha DAP 6.85 2.97 2.714 19.97
6 Zone 2 (Med) - Rate3 @ 80kg/ha DAP 8.23 3.03 2.693 22.18
7 Zone 3 (High) - Rate 1 @ 40kg/ha DAP 18.19 1.72 3.269 19.51
8 Zone 3 (Med) - Rate 2 @ 60kg/ha DAP 12.26 1.83 3.102 16.92
9 Zone 3 (High) - Rate 3 @ 80kg/ha DAP 17.88 1.45 3.416 18.08

Grain yield t/ha


Grain copper mg/kg


Grain manganese mg/kg


Grain zinc mg/kg

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 1, Coonalpyn , SA Brown sandy loam over clay
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 1, Coonalpyn , SA Calcarosol
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, Coonalpyn SA


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.

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Trial last modified: 30-09-2019 16:08pm AEST