In season potassium response in barley

CC BY 4.0

Research organisatons
Funding source

Trial details

Researcher(s) Darren Chitty (Landmark)
Year(s) 2016
Contributor West Midlands Group
Trial location(s) Moora, WA
In season potassium response in barley locations

Evaluate Lokomotive as an in season foliar potassium source for correcting potassium deficiency and compare to muriate of potash (MOP).

Key messages

A trial was established west of Moora in 2016 to investigate in season potassium response in barley. The main objective was to compare Lokomotive, a liquid potassium product, to the more commonly used granular muriate of potash (MoP).  Both soil and plant sample analysis showed the site to be marginal/deficient in potassium. Treatments were applied at GS 32. This timing was chosen as potassium deficiency is most commonly identified late in the growing season, when visual symptoms appear, and confidence in an economic response to applications of MoP in the current season is diminishing. At the time of application there were typical potassium leaf deficiency symptoms on the lower leaves. 

Good growing conditions were experienced in Moora in 2016 and resulted in high barley yields of 4.17 to 4.39 t/ha. There was a small yield response (1.7% to 5.3%) from both Lokomotive and MoP however this was not significantly different to the untreated control. The small response to potassium in 2016 may be attributed to the wet spring conditions that would have made potassium in the soil more available to the crop. Further evaluation of in season potassium application is required when spring conditions aren’t as favorable as 2016.  



Lead research organisation Landmark
Host research organisation West Midlands Group
Trial funding source Landmark
Related program N/A

Brennan family

Other trial partners Not specified
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Crop type Barley
Treatment type(s)
  • Fertiliser
Trial type Experimental
Trial design Replicated

Moora 2016

Sow rate or Target density 70kg/ha
Sowing machinery

Trial plot seeder KPPW

Sow date 12 May 2016
Harvest date Not specified
Plot size 1.8m x 18m
Plot replication 3

Landmark MES10 80 kg/ha + Urea 80 kg/ha @ sowing. UAN 60 L/ha at tillering. (72N,14P,0K,8S)


Trifluralin 2L/ha + Boxer Gold 2.5 L/ha

Velocity 1 L/ha + Liberate 0.5% @ tillering

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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
Moora, WA Sandplain
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Moora, WA Tenosol
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 Moora WA
2016 102.8mm
2015 105.1mm
2014 88.5mm
2013 118.8mm
2012 138.2mm
2011 107.4mm
2010 102.0mm
2009 113.9mm
2008 120.4mm
2007 84.7mm
2006 113.8mm
2005 97.1mm
2004 75.7mm
2003 96.1mm
2002 77.2mm
2001 56.4mm
2000 110.9mm
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.

Moora WA


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 last modified: 23-07-2019 14:42pm AEST