Here is a video showing how small pro-sumer drones can be used on the farm. The video shows a DJI Phantom 3, but there are similarly sized and priced platforms which would also work. With the lower cost of these smaller platforms, it is fairly easy to have them pay for themselves in just a few flights. Keep in mind, however, that any use that is not strictly for hobby or recreational is considered commercial use by the FAA and the operator will need to have a Part 107 Remote Pilot Certificate. For those of you interested in getting certified, Jonathon Rupprecht has put together some great information online: How to Get Your FAA Drone Pilot License (For First-Time and Current Pilots).