Over the years, ground that has had cows and horses on especially in wet weather, will become more and compressed with less and less air in the soil. Eventually, it will need to be ploughed and although your paddock will green up this spring, it depends wheat stage your land is at as to whether it needs the plough. In the winter, we have our stock in one field knowing that its going to be a mess but also knowing that we're going to plough and reseed it. In this way, each field gets ploughed every four or five years or so.