A comparison of potassium rates and timings in canola

CC BY 4.0

Research organisatons

Trial details

Researcher(s) Peter Rees (Summit Fertilizers)
Year(s) 2009
Contributor West Midlands Group
Trial location(s) West Moora, WA
A comparison of potassium rates and timings in canola locations

This was the first year of an intended long term trial investigating the effect of K nutrition on sandplain. Potassium was applied at rates between zero and 100 kg/ha IBS and banded in the forms of MOP and compound NPK product (Vigour).

Key messages
  • There were no significant differences between K sources or rates at this trial, despite soil test model predictions of high K response.
  • Canola did not respond to high P application at this site in the absence of Nitrogen.
  • The site was highly N responsive, although the N use efficiency suggests leaching was moderate. This may have been compounded by low pH and the presence of Aluminium in the subsoil.
  • More K response may be seen in wheat in the 2010 season.
Lead research organisation Summit Fertilizers
Host research organisation N/A
Related program N/A

Thanks go to the Hamilton and McTaggart families for access to their property.

PAPER REVIEWED BY: Brett Beard, Summit Fertilizers

Other trial partners Kalyx Agriculture
Download the trial report to view additional trial information


Crop type Oilseed: Canola
Treatment type(s)
  • Fertiliser: Application Method
  • Fertiliser: Rate
  • Fertiliser: Timing
Trial type Experimental
Trial design Replicated

West Moora 2009

Sow rate or Target density 5kg/ha
Sow rate or Target density 5kg/ha
Sow date 19 May 2009
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Psuedoreplication Not specified

All treatments (except Treatment 1 - UTC) had 100kg/ha MAPSZC (10.6N, 21P, 8S, 0.3Cu, 0.3Zn) basal at seeding. All treatments (except UTC and Treatment 3 – 0 N) had 120kg/ha N applied as Urea in 3 timings; 1st - IBS on 19th May; 2nd - 4-6 leaf on 29th June; 3rd - pre-spiking on 3rd August

Soil amelioration

2t/ha Lime & 200kg/ha Gypsum were applied pre-seeding

Seed treatment Jockey & Gaucho
Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Variety
Treatment 1
Treatment 2
Grain yield (t/ha)
1 Cobbler Untreated control Nil N 0.91
2 Cobbler 0 K 120kg/ha N 1.78
3 Cobbler 25 K banded as MOP Nil N 0.79
4 Cobbler 25 K banded as MOP 120kg/ha N 1.73
5 Cobbler 12.5 K banded as MOP 120kg/ha N 1.75
6 Cobbler 6.25 K banded as MOP 120kg/ha N 1.83
7 Cobbler 25 K topdressed IBS 120kg/ha N 1.97
8 Cobbler 50 K topdressed IBS 120kg/ha N 1.94
9 Cobbler 100 K topdressed IBS 120kg/ha N 1.93
10 Cobbler 12.5 K banded as Vigour 120kg/ha N 1.86
11 Cobbler 16 K banded as Vigour 120kg/ha N 1.73

Grain yield t/ha

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
West Moora, WA Yellow sandy loam
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
West Moora, WA Chromosol
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 West Moora WA
2009 371.9mm
2008 365.0mm
2007 327.0mm
2006 360.9mm
2005 329.0mm
2004 287.8mm
2003 316.4mm
2002 294.2mm
2001 329.7mm
2000 441.0mm
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



West Moora WA 2009

Observed climate information

Rainfall trial gsr (mm) 381mm

Derived climate information

West Moora WA


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

SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
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

2009 trial report

Trial last modified: 27-06-2019 11:53am AEST