It is only good manners to phone ahead for prior permission.
It is only self-preservation to have enough fuel to go elsewhere; did you plan to refuel at this farm strip?
I'm wondering what you were flying at the time.
Glider pilots, before going cross country, must understand how to select a safe landing field. In addition to Size, Slope and Surface, we must look out for animals, and cricket players. If a field is cluttered with dogs, people, horses, you must go elsewhere.