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Seal the bottom buried section, any moisture can wick up through the grain to the top exposed section. Use a tar based sealant.
If you want to get really serious about it buy from your marine supplier some Everdure 2 pot. Its an epoxy varnish. First coat goes on with 50% turps and soaks right in, second coat is 25% turps, last coat is 100% varnish. I've rebuilt boat hulls with that stuff, it never rots !! Turns the wood into concrete.
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