I've had my 8 runner ducks for 9 months now. Their yard started out lush and grassy, but now it's mostly bare dirt that's rather compacted. I'd like to get back to that cushy lushness, if it's even possible (I've always heard that duck poop won't sour soil, but maybe that's not the case, dunno?). It would be nice for the lawn to feed them and also keep their feet healthy (worried about the currently hard soil hurting them). Do you have any tips and tricks to keep the ground soft and plant friendly?