I am not a spray drone market bleeding edge observer.  I see lots of rotary drones entering the spray market.  

Friend of mine has some drone engineering experience and has said for years that the key to delivering payload is fixed wing flight, launch with a catapult and catch with a net, which are equipment well within our capacity to deploy on farms.  

Well, I just caught this Mark Rober video showing fixed wing drones deploying in Rwanda with a catapult, tailhook wire, easily disassembled, and while payload is small, delivery is longer distance (ie weight/distance ratio could change for local spray delivery/lesser distance).

Any comments, thoughts, or leads to emerging technology?  First couple minutes is about rotary tech then it switched to fixed wing.

 https://www.youtube.com/watch?v=DOWDNBu9DkU