For niche spraying where you can't get to the ground I'd rather see a robot on little slits or something. If you can get to the ground, well, those chemicals are heavy and drones run on pretty terrible batteries.
>These tractors can cost up to half a million dollars to purchase and about US $7 a hectare to operate.
>A pair of Hylio’s drones cost a fifth of that, Erickson says, and operating them costs about a quarter of the price.
About zero farmers are buying a tractor solely for spraying crops, but honestly if you have the money for a new tractor, knock yourself out with a stupid drone, why not?