Bone meal is a great way to increase phosphorus levels in your soil. You can purchase phosphorus fertilizers or bone meal at lawn and garden center to use on your plants. If you would prefer to know what is going into your garden and avoid some of the expense that goes along with purchasing fertilizers from a retail store, you can make your own liquid bone meal fertilizer with a few scraps and items in your home.
Collect bones from various meals eaten in the past few weeks. They can be chicken bones or bones from steaks.
Boil the bones in a pot of water to clean them of any remaining fat or meat.
Place them on a grill for about an hour. Make sure the grill is on a high heat with the lid down. You could also dig a pit and cook them over an open flame, but the main purpose is to dry them out completely so that they are brittle and easily crushed.
Remove them from the heat and allow them to cool.
Place them on a metal pan and crush them into smaller pieces. You can use a rock or hammer for this. Once they are smaller, put them into a grinder or old blender to break down further.
Press into a fine powder using a mortar and pestle.
Add water to the powder until it gets to a consistency that can be sprayed. Fill up a spray bottle and apply to plants.