I have an old over grown pasture, covered with willow, tag alder, and such brushy vegetation. How do I eracticate these things so they won't grow back? Do I have to dig them out, do I have to use herbicide(yuck)? I don't have a tractor, but can borrow one. Also I have had some wood harvested behind this pasture and they left huge ruts all over how do I fix them?