"growing 60 to 70 bu. S.B. s annually, and for some 20 to 30 seasons. right next to fields that have NEVER seen 30 bu. S.B. s because of a few management decisions. Practices."

So what specific management decisions and practices are these guys employing that triples their yields from the neighbor across the fence?  Unless the guy across the fence has mined out his soil and has excessive wind erosion, I find it hard to believe there is that big of a difference, short of a significant soil type change or irrigation.