@Pico_Banana,
I agree with your analysis and I sympathize with your solution, but, but, but…
this board is FULL of threads of people not getting along with their neighbors and it interfering with the enjoyment of their property and horses.
It’s a question of whether you want to be right, or want to be happy.
I vote for doing something to pacify the neighbor to preserve peace in the neighborhood AND set clear boundaries. I’d want to see the receipt for what he sprayed, and then I’d offer to pay half and take hay off the unused 4 acres. Then I’d get him to sign an agreement for the 4 acres, with language that made it clear his use of the land was restricted to the 4 acres and for this year only.
I am in an idyllic neighbor situation, where everybody helps everybody else out, and we all have permission to cross each other’s land. But every single one of us has been annoyed at one of the others at some point or another: at dogs, at kids tearing up grass with ATVs, getting equipment stuck, interfering with hunting, fertilizer run off causing an algae bloom in a pond, loose horses (that one’s me.
), etc. It’s never all the same annoyer or all the same annoyee. But to a person, we all suck it up and deal with it because it’s not worth blowing up a relationship with a neighbor when we’re in such a great situation.
Now, the farmer’s behavior in the OP’s story was WAY more egregious, but still…I’d rather set some boundaries and preserve the relationship.