I wondered about mulching large fields too, and this seems to be the answer. Again, on large scale, big tools make the job easier and faster:
...I can't do things this way because it's the heavy weight and power that lets them crimp and cut through the covercrop. Mine is on a no-power tool small scale made even easier to manually manage, though time consuming, by breaking up into small postage stamp beds. I'm looking for how people who are using power push/self driving tillers and ride on lawnmower size tools are handling it.