I don't think we have any evidence to back that up. I can give you a personal example. A neighbour of ours who does plow all his land that he puts into crop has the same problem as we do on our farm, where we use minimal tillage. This was only his second year growing wheat and his problem was as severe as ours. There may well be a linkage, but at the same time we've been encouraged to do minimum tillage in particular in this part of the country to reduce erosion and stuff like that.
We feel as producers that we're using a lot better tillage practice today than we were ten years ago, for example. But there may well be a linkage; there may well be.