One half of our lawn is a sorry mess. There are two stumps & root systems that were removed at different times in the past. The stumps were ground down, but each year the below-grade stump and root systems rot a little more leaving awful furrows and deep divot in the yard surface.
What, if anything, can be done? I've thought about removing the sod and filling in the cavities gravel, then laying down new topsoil and replacing the sod. But, I don't think this will stop the rot that caused the ground to sink. Any help?