Herbigation can be used to apply herbicides in Western Canada. Herbigtion is the process of applying an herbicide to the soil or plant surface by injecting the chemical into the irrigation water. Some herbicides are more effective if applied with irrigation water. This is especially true for pre-emergence herbicides that require moisture to be activated. Not all herbicides that are registered for use on potatoes can be applied through herbigation. Consult the chemical manufacturer or your local agricultural representative before herbigating.