Done! https://www.openstreetmap.org/changeset/123410546

I've updated the fields and surrounding highways and apparently there is a trail passing along the horse fields https://www.openstreetmap.org/way/1077210228 (refresh your map, it is updating). I've put it as "access=private + fixme=access?" though, as well as for the larger ways going through the farm. By any chance, did you notice it and see if it's accessible to anyone just like for the natural reserve? 