I've been splitting a lot of wood lately that's been bucked and stacked since last winter. When it comes to the maple, it seems like some of it has turned punky in places where it's been in contact with the ground (not actually dirt, we laid down 100 yds of wood chips in the woodlot where we process the firewood so we don't have to work in the mud and deal w/ caked on dirt in the bark). The rest of the wood species seems to be OK inside after it's split, even parts that were in contact w/ the ground. I heard a few years ago something to the effect that maple has some kind of chemical or enzyme in it that begins to degrade the wood if it's not split soon after it's been cut. Any truth to that?