John Werries, his son Dean, and one employee are no strangers to making adjustments year-to-year to combat the unpredictable conditions of their Chapin, Ill., operation of no-tilled beans and strip-tilled corn.

Terry, Mont., no-tiller Todd Tibbetts manages weeds with high-capacity equipment on more than 4,000 acres on two farms separated by 70 miles.

It makes sense to scrutinize the financial returns of precision ag technology costs, says Matt Darr, an Iowa State University ag engineer. But Darr says farmers continually remind him about the intangible benefits of using these tools that in many cases are just as important as dollars-and-cents justification.