you have only got to look at the cut and burn farming going on in the amazon basin to see that after a short time, nutrients are gone out of the land? id imagine in europe thousands of years ago when farming started the same happened, biggest difference above everything Yesmentioned on this thread, is the growing size of the worlds population? Yes the UKs farming could go back to how it was 70 odd years ago with a modern twist? but at the same time could we also have the UKs population back to that size of 70 odd years ago ?