How much salt is needed to kill a tree?

The amount of salt needed to kill a tree can vary depending on the tree species, its size, and environmental conditions. Generally, applying a concentrated salt solution (like rock salt or table salt) at a ratio of about 1 to 2 pounds per inch of trunk diameter can be harmful. However, using salt in this manner can also damage surrounding soil and plants, making it a harmful practice for the ecosystem. It's important to consider alternative methods for tree removal or management.