Depends on the airspace classification above the farm (affects your airspace and how tall it is). Also technically you can only fly it if you're an amateur, wh

Depends on the airspace classification above the farm (affects your airspace and how tall it is). Also technically you can only fly it if you're an amateur, which (as a professional farmer/operator) wouldn't qualify. Often these places are pretty lax though, and if you already have clearance to fly a private aircraft there you can just advise your ATC and go from there. If you're concerned about that, you have to get a CoA, and then the language of the CoA itself will outline who you have to notify, where you can/can't fly and what altitudes.