Oak leaves have an NPK of 0.8/0.35/0.2 compared to fresh cow manure which is 0.29/0.25/0.1, so leaf mold is actually a pretty good source of nutrients - and it's consistent. Compost, on the other hand, can be all over the map depending on it components - i.e. garbage in...garbage out. I know a lot of folks who use nothing other than leaf mold for fertility.
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