we have recently purchased a old 6 acre old farm and want to eliminate a semi-wet[in winter] area with wire grass in it so we could eventualy plant something in that area ,its about 2 acres of mixed pasture with wire grass.we will be needing to get some permits in the next couple years and dont want this area deamed "wet land".what can we do.we have a 40hp 4wd tractor that we can use.should we rototill or disc it???what about spraying???