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The term 'residual' applies to a number of herbicides that have a long lasting activity in the soil. These herbicides are often applied directly to the soil prior to planting crops, pre-emergent.
In 2021 the Department is conducting over 300 research trials across the state from Kununurra in the north to Esperance in the south.
Lupins should be harvested as soon as they are mature to minimise significant yield loss.
40% lower germination was measured from seed of plants exposed to wetting and drying at maturity.