Can we reduce our phosphorus inputs?


Research organisaton
Funding source

Trial details

Researcher(s) Sean Mason (UoA)
Therese McBeath (CSIRO)
Cathy Paterson (SARDI)
Year(s) 2011
Contributor CSIRO - Ecosystems Science
Trial location(s) Minnipa, SA
Can we reduce our phosphorus inputs? locations

To investigate the quesion 'Can we reduce our P inputs?’ 

Key messages
  • Reducing P inputs has a risk attached to it, but excessive use of P fertiliser is also a risk to profit making.
  • After several seasons with high crop yields, reduced P inputs are not maintaining soil P fertility.
  • Monitoring soil P fertility can be a cost-effective method to manage the risk associated with reduced P inputs.
Lead research organisation CSIRO - Ecosystems Science
Host research organisation N/A
Trial funding source GRDC UA0017
Related program Eyre Peninsula Farming Systems

Thanks to the GRDC projects UA0017, UA00103 and CSA020 for funding this work and to Nigel Wilhelm for helpful comments on this article.

Other trial partners SARDI
Download the trial report to view additional trial information


Crop type Other: Not specified
Treatment type(s)
  • Fertiliser: Rate
Trial type Experimental
Trial design Unknown

Minnipa 2011

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Psuedoreplication Not specified
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
Minnipa, SA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Minnipa, SA Calcarosol
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 Minnipa SA
2011 383.4mm
2010 385.3mm
2009 391.3mm
2008 330.4mm
2007 331.2mm
2006 334.5mm
2005 288.0mm
2004 296.1mm
2003 293.2mm
2002 283.3mm
2001 343.9mm
2000 389.0mm
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.

Minnipa 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.

Trial report and links

2011 trial report

Trial last modified: 14-05-2023 08:19am AEST