Investigating double break (or stacked rotation) options for weed and disease control


Research organisaton
Funding source

Trial details

Researcher(s) Nathan Craig, Chris Wilkins and Brianna Hindle (WMG)
Year(s) 2017
Contributor West Midlands Group
Trial location(s) Site 7, Merredin, WA
Related trials
Investigating double break (or stacked rotation) options for weed and disease control locations

To demonstrate the rotational benefits of a sequence of broadleaf, legume, and pasture crops for the production of wheat in the Kwinana West and East zones of WA.

Key messages

The trial will be going into its 3rd year in 2018 and all trial plots will be sown into wheat. The aim is to determine the difference in grain yield for wheat following a range of single or double break crop rotations, compared to continuous wheat. The site was established in 2016 on a paddock that had very high level of ryegrass that was affecting crop production. This area around this trial has been in pasture for 2017 as the comparison farmer solution for the issue.

Lead research organisation West Midlands Group
Host research organisation West Midlands Group
Trial funding source GRDC WMG00003-A
Related program N/A
Acknowledgments N/A
Other trial partners GRDC
Download the trial report to view additional trial information


Crop type Wheat
Treatment type(s)
  • Crop: Rotation
Trial type Experimental
Trial design Blocked

Merredin 2017

Sow rate or Target density 100 kg/ha
Sowing machinery

Kalyx seeder - knifepoint & presswheel 

Sow date 5 June 2017
Harvest date 25 November 2017 25th November 2017
Plot size 3.6m x 12m
Plot replication 4
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Download results

Trial results Table 1

# Variety
Treatment 1
Grain yield (t/ha)
1 Hurricane Lentils Merredin na
3 Field pea
4 Oats Merredin 0.78
5 Wheat Merredin 2.76
6 Jurien Lupin Merredin 2.72
8 Hurricane Lentils Miling 0.97
9 Wheat
10 Jurien Lupin Miling 0.82
12 Hurricane Lentils Miling 1.6
14 RR Canola Bencubbin 1.42
15 Jurien Lupin
16 Hurricane Lentils Bencubbin 0.59
17 Albus Lupins
19 Hurricane Lentils Bencubbin 0.6
20 Field pea Calingiri 0.97

Grain yield t/ha

Observed trial site soil information
Trial site soil testing
Site Depth Type pH EC P K N A OC CAT
Site 7, Merredin, WA 0 - 10cm 4.70 0.17 22.00 54.00 0.57
Site 7, Merredin, WA 10 - 20cm 4.60 0.05 19.00 36.00 0.27
Site 7, Merredin, WA 20 - 30cm 5.60 0.04 7.00 30.00 0.17
Site 7, Merredin, WA 30 - 40cm 6.00 0.04 3.00 26.00 0.14
Site 7, Merredin, WA 40 - 50cm 6.20 0.08 2.00 47.00 0.15
Soil conditions
Trial site Soil texture
Site 7, Merredin, WA Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 7, Merredin, WA Sodosol
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



Site 7, Merredin WA 2017

Observed climate information

Rainfall avg ann (mm) 328mm
Rainfall trial total (mm) 316mm
Rainfall trial gsr (mm) 195mm

Derived climate information

Site 7, Merredin 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.

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Trial last modified: 23-07-2019 14:57pm AEST