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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.
Herbicide performance can vary greatly depending on a number of factors. These can include compatibility of herbicides, water quality, sprayer decontamination and controlling stressed weeds.
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.
Controlled traffic farming (CTF) is a farming system built on permanent wheel tracks where the crop zone and traffic lanes are permanently separated.
Flaxleaf and tall fleabane (Conyza spp.) are emerging weeds in Western Australia, germinating in spring and becoming major weeds in summer.
Doublegee or spiny emex is a significant weed in Western Australia. It is a vigorous annual herb with a strong tap root and a long, fleshy, hairless stem.