This interests me since I'm in the agriculture / commodities market myself, but in all my time here in this community, I don't think I've ever seen enough discussions of agriculture to warrant a dedicated subforum.
What if you made an event where users interested (like myself) could join and discuss what we do, what impact we have, and build relationships. That way, you also have the control of kicking users who don't bring value to the discussion.
So - I vote no on the subforum, but please PM me if you decide to do the event. I'm in for that

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