The only type of ashed that should be used are pure hard wood ashes. Never use soft wood ashes like pine, also there are alot of inks in paper so I would only use purely burnt down CLEAN hard wood. Also highly acidic soil amendments should be nutrlized with just a bit dolminte lime. Unless you sure of the origins of the ash I wouldn't bother Much better with bat guano top dressing or bat guano tea
Peace the .. LAB