Reading the following link about tree stump removal or killing a tree, suggests using rock salt. Won't the salt affect the ground around the tree stump after decay or during decay? Will the salt affect other plants growing in the area? https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-stump-removal.htm
Certified GKH Gardening Expert
Yes, it is possible for the salt to effect, damage or kill the grass around the stump.
These effects may be corrected after the stump has been removed.