I like troths.com it's not agricultural (trough is agricultural) it's old English. Definition:
A troth is a serious promise to be faithful, such as a pledge people make about getting married. If you and your girlfriend announce your troth at a family dinner, then that means you better be serious about your relationship.
It also used to be another term for 'truth'.
All the same it's not a known word anymore, not common enough to have major value and as you see here most people will think you mean troughs.
It's a good English word but value will be tough I think....mid XXX I would guess.
IMO