Pippa Michael (Curtin University)
Site 2, Kwinana, WA
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.
(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||
|Host research organisation||N/A|
|Trial funding source||GRDC SDI00018|
Regional Cropping Solutions Network
|Other trial partners||Not specified|
|Trial design||Not applicable|
|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.
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.