I would think it would be hard unless they are monopoly buyers - otherwise they invest in seed technologies that farmers than may end up selling mostly to other buyers. But not a context I know. Industry associations/cooperatives could perhaps overcome some of the coordination/spillover issues

Updated link: blogs.worldbank.org/en/impacteva...

Yes, it is unclear why a risk-neutral large manufacturer does not offer this, but perhaps the transactions costs are too high with lots of tiny vendors