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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.
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%.
Barley grass is a common name for Hordeum glaucum and H. leporinum.