Urease inhibitors

CC BY 4.0

Research organisatons

Trial details

Researcher(s) James Easton (CSBP)
Jonathon Wyber (CSBP)
Year(s) 2014
Contributor West Midlands Group
Trial location(s) Warradarge, WA
Urease inhibitors locations

To determine the effectiveness of urease inhibitor products.

Key messages
  • The site was very responsive to nitrogen (N) fertilizer. 30kg N/ha increased yields by about 0.5 t/ha (18 kg grain/kg N).
  • 12mm rain fell 3 days after the N applications in June. This would have limited volatilisation losses.
  • The trial site was also quite variable and no response to the urease inhibitors was measured.
  • Hectolitre weights were 75-77 kg/hl, and screenings about 3%.
Lead research organisation CSBP
Host research organisation West Midlands Group
Related program N/A

Ryan Guthrie and Rowan Maddern (CSBP Field Research).

Other trial partners Not specified
Download the trial report to view additional trial information


Crop type Wheat
Treatment type(s)
  • Fertiliser
Trial type Experimental
Trial design Replicated

Warradarge 2014

Sow rate or Target density 75kg/ha
Sowing machinery

CSBP Primary Sales cone seeder.

Sow date 5 May 2014
Harvest date 11 November 2014
Plot size 2.5m x 20m
Plot replication 5

Seeding: 100 kg/ha Big Phos,

June 18: 50 kg/ha MOP basal, Z13 treatments applied

July 22: Flexi N applied to treatment 6.


118 g/ha Sakura, 2 L/ha Treflan, 400 ml/ha Lorsban, 1.6 L/ha Ultra max May 5: 650 ml/ha Velocity, 400 ml/ha LVE June 18.

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
Warradarge, WA Non-wetting sand
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Warradarge, 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 Warradarge WA
2014 203.5mm
2013 239.1mm
2012 214.0mm
2011 211.7mm
2010 187.0mm
2009 206.3mm
2008 240.3mm
2007 178.6mm
2006 169.5mm
2005 212.6mm
2004 187.4mm
2003 197.0mm
2002 175.8mm
2001 179.5mm
2000 196.3mm
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



Warradarge WA 2014

Observed climate information

Rainfall trial gsr (mm) 358mm

Derived climate information

Warradarge 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 last modified: 23-07-2019 11:24am AEST