Interesting, informative article. It's rather interesting what's happening here in Australia. Your smaller farmer stopped doing heavy crop rotations in the 1940s and 1950s with the advent of a new consumer market for pesticides and fertilisers. But now, due to erosion and diminished crop yields, many are going back to the old traditional ways, including crop rotation. On the other hand, the larger industrialised corporate farming don't do crop rotation, they just use it and move on - squeeze out every ounce and then just leave it to become wasteland. Very sad.