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In 2021 the Department is conducting over 300 research trials across the state from Kununurra in the north to Esperance in the south.
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.
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.