James, that is really interesting. I've heard of two harvests from the field in America, but our vegetation periods are just too short for that. When growing wheat twice in a row was still a thing here, you'd see people seeding right behind the combine, too, though. However, that's just not profitable anymore.
The whole frost loosening thing is actually still used by many farmers here, although we don't do it anymore since the winters barely get cold enough for any significant frost to loosen the soil and if you plow too late or when it's too wet you do more harm than good with plowing. Of course the best way to loosen up your soil is to not compact it in the first place, which is why we rarely if ever work a field when it's still wet out.
