Nick Guetterman looks over the data shared by his crop sprayer and cell phone while on his farm near Bucyrus, Kan., Wednesday, Feb. 19, 2014. Farmers from across the nation gathered in Washington this month for their annual trek to seek action on the most important matters in American agriculture. But this time, a new issue emerged: growing unease about how the largest seed companies are gathering vast amount of data from sensors on tractors, combines and other farm equipment. The sensors measure soil conditions, seeding rates, crop yields and many other variables. (AP Photo/Orlin Wagner)
Nick Guetterman climbs into a crop sprayer equipped with GPS and digital uplink while on his farm near Bucyrus, Kan., Wednesday, Feb. 19, 2014. Information uplinked from the farm implement is available via the cloud to computers and mobile devices on the farm. (AP Photo/Orlin Wagner)
Large seed companies are harnessing "big data" to provide farmers with guidance on how to get the most from their fields, but some farmers are concerned this information could be hacked or exploited by corporations or government agencies.