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Either way, and you'll likely hear arguments to the contrary here, I would not sink the post directly in concrete. I'd back fill the hole with a good free-draining gravel, or a processed stone (we call it crusher run). Both compact solidly, but still allow for water in the ground to drain away from the post, keeping it as dry as it can be in the ground. Treated wood is best for longevity. Concrete can, and will hold the moisture against the wood. Remember that concrete is a porous material, meaning that moisture can pass through it, albeit very slowly. But that slow passing also keeps the concrete wetter longer against the wood.