Plenty of farmers are using drones to better manage their crops. Take the DJI MG-1P for instance: it is an agricultural spraying drone that allows farmers to become more efficient by flying pre-planned routes. In fact, 5 aircraft can be controlled at once within a 3-km range.
The MG-1P supports high-resolution video transmission within that range. It has a camera with a 123-degree wide angle view. It can also detect obstacles from multiple directions. The above video shows this drone in action.