In addition to eggshells, I make garden mineral supplement using wood ash and chicken bone. I am vegetarian, and all of the bones come from the dog food I make for Rufus, which uses chicken thighs. My calculations from the few articles that I could find about chicken bone ash, is that Calcium content is about 68% and phosphorus content is about 29%. Wood ash is more complicated, varies by tree species and probably where it is grown. From Wikipedia, calcium content can vary from 25% to 45%, less than 10% potassium, and less than 1%phosphorus, with the rest being trace minerals.
By my tests, my garden soil is deficient in calcium, phosphorus, and potassium. So I supplement. Growing crops removes a lot of those elements, which go into the plants and the food products.
I dry the chicken bones same same as I do eggshells. They are already slow cooked overnight in the process of cooking for Rufus' meals. I haven't been using the woodstove much, but today was chilly so I made a fire and added a big batch of bones.
After the fire burns out and cools, I collect the ashes and spread on the garden soil. It's a dusting, not a thick layer. I prefer doing that before planting anything in that area and letting it mellow a week or more. In the past I tried just burying the bones, but sometimes they don't break down and I find them when cultivating. Burnt bones are mostly fine ash, and the ones that are recognizable are brittle and crunchy like potato chips, and disappear when cultivating.
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