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Waterlogging in the higher rainfall areas (more than 450mm) of South West Western Australian crops and pastures is a common cause of reduced plant growth in winter, especially on duplex soils.
Waterlogging causes significant reductions in plant growth in some years and some environments in the high rainfall (greater than 600mm annual rainfall) areas of South West Western Australia.
Permanent raised beds are a practical and economic means of managing some waterlogged sites in wetter areas of the Western Australian grainbelt.
In Western Australia, competition from 7-90 capeweed plants per square metre in a wheat crop can reduce crop yield by 28-44% and net return by 25-76%.
The most accurate way to estimate the weed population of a paddock is to count the number of plants in an area of known size at a number of locations.
Silver grass is an annual grass occurring in both cropping and grazing regions across Australia. There are several species, the most common being Vulpia myuros and V. bromoides.
Herbicide resistance is the inherited ability of an individual plant to survive a herbicide application that would kill a normal population of the same species.
Waterlogging causes clay to disperse in sodic soils, leading to soil structure collapse.
Annual ryegrass (Lolium rigidum) is one of the most serious and costly weeds of annual winter cropping systems in southern Australia.