I have a question pertaining to using Hugelkulture. I'm planning on taking a already made raised bed and replacing some of the soil at the bottom with rotting logs. Since logs are such nitrogen hogs at first when decomposing, would it make sense to add some bat guano on top of the logs to help balance it out?
As I understand it... the logs aren't necessarily nitrogen hogs. If your wood is semi-decomposed, or you are using small diameter wood the nutrients within are likely to release in the first year (eg. branches, twigs, and anything smaller than a skinny human arm). That's been my experience at least. The type of wood makes a difference as well. Oak will take longer to release the nutrients compared to say a poplar.
If you've got free bat shit that is easily attainable I'd say go for it but it's not necessary.