Best bet management of ameliorated non-wetting soils of the Geraldton Port Zone - Irwin


Research organisatons
Funding source

Trial details

Researcher(s) Debbie Gillam, Mingenew-Irwin Group
Year(s) 2017
Contributor Liebe Group
Trial location(s) Irwin, WA
Best bet management of ameliorated non-wetting soils of the Geraldton Port Zone - Irwin locations

To determine the best way to apply nutrients and increase nutrient uptake on non-wetting soils after amelioration in the Geraldton port zone.

Key messages
  • The treatment plots with low or no potassium were observed to have less vigour (visual assessment) and plant density from emergence.
  • High potassium treatments had lower screenings and higher yields independent of the rate of nitrogen applied.


Lead research organisation N/A
Host research organisation Grains Research and Development Corporation
Trial funding source GRDC LIE00010-A
Related program N/A

Many thanks to the Department of Industries and Regional Development (DPIRD) for their assistance with trial management, CSBP for technical support and, the Kelly Family for the site and assistance.

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


Crop type Cereal: Wheat
Treatment type(s)
  • Fertiliser: Application
Trial type Experimental
Trial design Replicated
Sow rate or Target density 80 kg/ha
Sowing machinery Not specified
Sow date 16 May 2017
Sow date 16th May 2017
Plot size 2m x 20m
Plot replication 4
Plot blocking Not specified
Plot randomisation Not specified
Paddock history 2013: Wheat 2014: Lupins 2015: Wheat 2016: Lupins

16/05/2017: Seeding fertiliser as per treatment list

17/07/2017: 50 L/ha Flexi N


16/05/2017: 118 gm/ha Sakura, 1.5 L/ha Trifluralin

17/07/2017: 800 ml/ha Jaguar


16/05/2017: 200 ml/ha Lorsban, 200 ml/ha Dominex

Fungicide Not specified
Pesticide Not specified
Soil amelioration Not specified
Seed treatment Not specified
Inoculant Not specified
Tillage Not specified
Other trial notes

For further information, contact Debbie Gillam, Mingenew Irwin Group
0427 281 006

Download the trial report to view additional method/treatment information

Trial results Table 1

# Variety
Plant density (plants/m2) Screenings (%) Returns ($/ha) Hectolitre weight (kg/hL) Protein (%) Grain yield (t/ha)
1 Std N no K 46 8.7 113 69.5 13.7 0.45
2 Std N std K 65 8.3 233 71.1 13.8 0.83
3 Liquid K 30 9 98 68.6 13.9 0.39
4 Std N High K 50 5.8 225 73 12.6 0.9
5 Low N, High K 62 6.3 228 71.2 13 0.91
6 Std N, High K 52 6.9 240 68.9 13.4 0.96
7 Std N, High K 61 6.8 245 69.4 13.6 0.98
8 Std N, no K 37 9.1 110 69.2 13.7 0.44
9 Std N, very High K 65 6.4 270 71.1 13.8 1.08
LSD 1.5 0.5 0.11
CV 13.4 2.3 9.4

Grain yield t/ha


Hectolitre weight kg/hL


Plant density plants/m2


Protein %


Returns $/ha


Screenings %

Observed trial site soil information
Trial site soil testing
Site Depth Type pH EC P K N A OC CAT
Irwin, WA 0 - 10cm 5.50 0.04 0.65
Irwin, WA 10 - 20cm 5.40 0.02 0.35
Irwin, WA 20 - 30cm 5.50 0.01 0.12
Irwin, WA 30 - 40cm 5.20 0.01
Irwin, WA 40 - 50cm 6.50 0.02
Soil conditions
Trial site Soil texture
Irwin, WA Pale deep sand
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Irwin, WA Tenosol
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



Irwin WA 2017

Observed climate information
Rainfall avg gsr (mm) 213mm
Derived climate information
BOM Data source IRWIN HOUSE [1034] 3km proximity to trial site location


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.