Just mulch them. You already have a lawn tractor. Get a mulching kit for it (block off plate and high lift mulching blades) and just mow them down.
I'm on 2.25 acres and have 5 maples, 2 oaks, 1 gum, 1 sycamore, 4 apple and 2 pear trees; meaning, I've got leaves. After only one season...