Bone meal is well suited for

Bone meal is a mixture of finely and coarsely ground animal bones and slaughterhouse waste products. It is a slow-release organic fertilizer, it supplies Phosphorus, Calcium and a small amount of Nitrogen to plants.
As the bone meal is water-insoluble, it needs to be broken down before the plant can absorb it, either by soil acidity or microbial activity-producing acids. That is why the bone meal is considered well suited for Acidic soil.