I have heard that dirt works as a type of innoculation in deep bedding to jump start the breakdown of the material. We have been putting very rich soil, which has recently added compost material, into the coop along with straw and pine shavings. We immediately noticed that the coop smells more earthy and less coop-like. Now, after several weeks, the material is less dense and more fluffed which makes the coop seem more comfortable and it seems to be degrading. I am really interested to hear the experiences of anyone else. Do you continue adding dirt, old leaves, finished compost? Does anyone else mix straw and shavings? Thanks everyone.