Have some rugged pastures that outside of strapping a spray setup to the horse there is no way to spray for noxious weeds other than by plane. Someone said kitfox used to sell a setup for this type of application or maybe some genius has already tested a pump 12v or air driven water pump like real dusters use and has the appropriate spacing for nozzles and how to hang a boom.

The other thing i started testing was air seeding radishes/turnips/ alfalfa etc... The inherent vortex under wings spread the seed pretty well but wondering if there are other ideas out there or someone who has tried this idea.
Thanks for comments,
Jared