Bone meal fertilizer is often used by organic gardeners to add phosphorus to garden soil.
Bone meal is a mixture of finely and coarsely ground animal bones and slaughter-house waste products. It is used as an organic fertilizer for plants and as a nutritional supplement for animals. As a slow-release fertilizer, bone meal is primarily used as a source of phosphorus and protein.
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It is also useful for balancing out other high nitrogen, organic soil amendments. For example, rotted manure is an excellent source of nitrogen but it tends to lack significant amounts of phosphorus. By mixing bone meal fertilizer in with rotted manure, you have a well balanced organic fertilizer.