_:genid1 "Free to use with credit to the original figure source."^^ . "drainage-tiles" . "6.8"^^ . "Drainage Tiles"^^ . "Producers have been installing subsurface drainage to remove more water from the fields."^^ . _:genid1 . . . . . . _:genid2 . _:genid2 . _:genid2 . _:genid2 . _:genid2 .