I t would help. For sure.
But, it would depend on the dampness of the ground, the soil composition,
wood species, the quality of the char, and what sort of ground the pole was planted in, and if there is vegetation growing against it.
The things that rot or deteriorate the pole are going to be bacteria and
fungi, mosses and lichens, or
ants or termites, depending on what the
local scene is.
Most poles will rot out at or near the point of contact with the soil. I've seen fences made from 100 year old fire killed western red cedar. That is where they rotted.
It sort of falls into the 'edge effect' phenomenon. There is more diversity two different climates meet than in either of the two climates would have as added individuals.
So, where air meets soil, where soil meets wood, where soil moisture meets wood, where plant moisture meets wood... that area usually rots first. Reducing those factors, while using a more rot resistant or dense wood might be a major factor as well as planting the poles in rockier or sandier soil rather than silty or clayey soil is bound to have a more favorable condition.