Weed mapping and ecology in the central and eastern wheatbelt of WA


Research organisaton
Funding source

Trial details

Researcher(s) Pippa Michael (Curtin University)
Year(s) 2013
Contributor Southern DIRT
Trial location(s) Site 2, Kwinana, WA
Weed mapping and ecology in the central and eastern wheatbelt of WA locations

To (i) determine possible associations between soil types and weed distribution within the Kwinana West and the Kwinana East Regional Cropping Solutions Network zones; and (ii) provide factsheets linking soil types to the top 5 weeds in each of the two zones, produced specifically for their zones and soils.

Key messages

(i) Greater than expected frequencies of the majority of grass species studied (great brome, soft brome, barley grass and annual ryegrass) were found on deep sandy duplexes with the exception of red brome, which had greater than expected numbers on saline wet areas in the Kwinana zone. (ii) Greater than expected frequencies of wild radish were found on calcareous loamy earths and clays and shallow loamy duplexes in the Kwinana zone. (iii) Less than expected frequencies of great brome, soft brome and barley grass were found on sandy earths. (iv) Less than expected frequencies of annual ryegrass were found on pale sands. (v) As every paddock has its own history with regard to crop rotation, herbicide use, soil cultivation etc., it is very difficult to determine a definitive “correlation” between soil characteristics and weed species incidence. (vi) At the systems level, the Ag Soils map units are not completely accurate, with many soils potentially occurring within any given system. The map therefore presents individual soils that are characteristics for each system, although an individual soil may not dominate each system. (vii) The lack of incidence data points for caltrop and fleabane meant no meaningful conclusions could be drawn from the statistical analysis as the chi-squared test was not significant. This may be due to both species being predominately summer growing and most surveys being conducted during the winter growing season. (vii) Further weed incidence surveys should be carried out during the summer fallow period.

Lead research organisation Southern DIRT
Host research organisation N/A
Trial funding source GRDC SDI00018
Related program Regional Cropping Solutions Network
Acknowledgments N/A
Other trial partners Not specified
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Crop type Fallow
Treatment type(s)
  • Soil
Trial type Article/commentary
Trial design Not applicable

Kwinana 2013

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Other trial notes

Note: the location of the site given here is for Kwinana  since this is the general area from which data was drawn: the latitude and longitude provided have been used to allow mapping capacity only.

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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
Site 2, Kwinana, WA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Site 2, Kwinana, WA Rudosol
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 Site 2, Kwinana WA
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.

Site 2, Kwinana 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

2013 trial report

Trial last modified: 24-05-2019 11:32am AEST