I've found a good way to get rid of and kill off poison ivy plants in my yard by making a homemade spray to kill the poison ivy plants.
To make the homemade poison ivy spray take a gallon of water and dissolve a cup of salt in the gallon of water and then add a tablespoon of dish soap to the salt and water and mix it up.
It's best to have a weed sprayer that you can mix the solution up into and then spray it around on the poison ivy plants.
You can also mix bleach with some water to kill the poison ivy plants because that works too.