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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.
A new guide has been published to assist cereal growers to identify frost damage and consider crop management decisions.
Taking experimental measurements can be labour intensive and time consuming, in addition the methods chosen must be repeatable (regardless of operator) with small degrees of error.
In 2020 the Department is conducting over 300 Grains Research trials across the state from Kununurra in the north to Esperance in the south.
This page hosts the 2018 frost trial information, handy project resources and the frost severity maps (from August).