Phosphorus response


Research organisaton
Funding source

Trial details

Researcher(s) Nicole Dimos (SPAA), Dom Clark, Charlton Jeisman, Sam Trengove and Sean Mason
Year(s) 2010
Contributor Society of Precision Agriculture Australia
Trial location(s) Mannanarie, SA
Phosphorus response locations

To compare the effects of different phosphorus rates and soil types on wheat production and to extend information to local growers and identify where savings can be made

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. The grower mentioned the importance of correctly identifying the GPS coordinate locations to get reliable soil type information. Yield maps provided showing areas of the paddock with high and low potential assisted this process. Soil analysis verified the trends produced by the yield map.

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) and run in conjunction with the Northern and Yorke Natural Resources Management Boar

Other trial partners GRDC, Northern and Yorke Natural Resources Management Board.
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Crop type Wheat
Treatment type(s)
  • Fertiliser: Rate
Trial type Precision agriculture
Trial design Not applicable

Mannanarie 2010

Sow date Late May 2010
Harvest date Not specified
Plot size Not specified
Plot replication Not specified


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Download results

Trial results Table 1

@T1: water
# Treatment 1
Treatment 2
pH CaCl2 (pH) Electrical conductivity (dS/m) pH (value)
1 Zone - High 0-30 cm depth 7 0.162 7.8
1 Zone - High 30-60 cm depth 7.5 0.223 8.3
2 Zone - High 60-80 cm depth 7.7 0.716 8.2
2 Zone - Low 0-30 cm depth 7.1 0.143 8.1
3 Zone - Low 30-60 cm depth 7.3 0.139 7.9
3 Zone - Low 60-80 cm depth 7.7 0.175 8.6

Electrical conductivity dS/m


pH value


pH CaCl2 pH

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Mannanarie, SA Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Mannanarie, 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.

Mannanarie 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: 30-09-2019 15:09pm AEST