My grandfather has 10 acres of pasture that we have our horses on. Each year the grass recedes back a little farther leaving more and more "just dirt" area. It was always that way in front of the feeders or where they pace the fence but it's getting worse. Would plug aerating the pastures help? There are fewer horses on the property now than there have been for the last 30 years so that's not the problem. We also rotate the pastures and always have one empty so it can rest and grow up a little.