Plenty of farmers are now using robots and drones to increase yield and reduce cost. The Pelican Spray is an autonomous electric crop duster is ready for night operations. It has 4 electric motors and 100kW of power.
This drone has 30 minutes of battery life. It can cover up to 242 acres per hour. With its short takeoff, need for extensive ground infrastructure is reduced. The above video shows this drone in action.