Having no-tilled since 1972, Paul Schaffert has learned a few things while growing corn, wheat, soybeans, sunflowers, milo and grain sorghum on a 2,000-acre irrigated and dryland farm in Indianola, Neb. The lessons have come even harder recently, because the area, which normally receives 10 to 17 inches of rain each year, has been suffering through a drought for the past several years and irrigation is now restricted to 13 inches per year.

No-tillers know the threat that compaction poses to their crops. And although no-tilling minimizes the risk of compaction, no-tillers might not understand how a hardpan might still sneak into their fields.