I really fail to understand where you are coming from. If a farmer wants to live out the rest of his years in his farmhouse, but sell off his land, as he is no longer fit enough to tend it, surely he should be within his rights to put a clause in along the lines of a covenant for no music festivals or building of sewage works etc.
I really fail to understand where you are coming from, if a farmer wants to have his cake and eat it, he can draw up a lease that expires with the parties involved.
That way future generations dont have to consult a lawyer about the current situation of the treeline or any other agreements between people long gone.