Precision agriculture has promised to revolutionize farming since the mid-1990s. The idea is to give growers more granular data about their operations and new technology to put that information to use. Some of this has come to pass: farmers have more sophisticated equipment and hard data on how their operations perform. But St. Louis Public Radio’s Eric Schmid reports, some of the loftiest promises of precision ag are still out of reach. This reporting is in conjunction with Harvest Public Media, a collaboration of public media newsrooms in the Midwest and Great Plains - including St. Louis Public Radio.