Nitrogen response trial


Research organisaton
Funding source

Trial details

Researcher(s) Nicole Dimos, Sam Trengove (SPAA), Sean Mason (University of Adelaide) and Charlton Jeisman (FSG)
Year(s) 2011
Contributor Society of Precision Agriculture Australia
Trial location(s) Site 3, Appila, SA
Nitrogen response trial locations
  • To compare the effect of in-crop nitrogen on grain yield of wheat.
  • To test if areas of a paddock are responsive to nitrogen.
Key messages

Farmers in this situation can be confident that since the NDVI and the N sensor measurements complement one another, the low producing areas can be farmed differently to the high producing areas. In order to maximise profits on farm, growers ought to consider varying inputs according to productive potential of their paddocks. Soil types vary considerably throughout the Upper North and can also be quite variable within paddocks. Considerable cost benefits can be made over time by using variable rate technology in paddocks with high variability. While the upfront costs might be large, the investment quickly pays itself off, giving farmers increased confidence in using the technology. Some training is often required when using new monitors and equipment however regular use and familiarity of products improves ease of operation.

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) through the UNFS/ SPAA ‘PA in Practice’ project

Other trial partners Roger Lange (Property Owner)
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

Appila 2011

Sow date 30 May 2011 Late May
Harvest date Not specified
Plot size Not specified
Plot replication Not specified

75kg/ha - 125 kg/ha DAP

Download the trial report to view additional method/treatment information
Trial source data and summary not available
Check the trial report PDF for trial results.
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 3, Appila, SA Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 3, Appila, SA 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



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 3, Appila SA

NOTE: Exact trial site locality unknown - Climate data may not be accurate

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: 23-09-2019 17:25pm AEST