I want to make a great acidic compost for my blueberries. I know pine straw is acidic,as well as oak leaves. I have those. I do want to use manure to make it hot. I have access to chicken,horse,or cow manure. I know those arent acidic. My question is this, can I just put some sulfur in the compost to make it acidic or will the pine straw do the trick in taking alkaline manure lowering its PH. I also will probably use coffee grounds. If there is anyone who has made acidic compost and has a great recipe, let me know. I guess another qustion would be is it even necessary to have an acidic compost?