Hydro-powered rock crushers? Wikipedia gives an example of a waterwheel-powered machine that crushed tin ore in Cornwall in the 1800s.
Maybe mixing the crushed rock in with seeds when they’re already being planted?
Maybe mixing the crushed rock in with seeds when they’re already being planted?
Windmills were used to crush grain too, but wind turbines are orders of magnitude better in terms of a solution.
I'm not kidding either.