Did you mean to say that the sword is a farm implement? Because it isn't. As far as the sword goes, the extent to which life in the fields informs its basic movements is probably rather minor.
No, not quite the same, but the basics are ingrained from the action in its self....
Another example is using an axe to to chop up wood. Almost similar to shomen uchi/giri in the sword.... the grip, the focus of the action physically..?
Swinging a sledge hammer has similarities....