The plastic that we grew our produce on last year is in poor shape so we are removing it and laying new for next years crop... pulling up the old stuff is a wee bit of a bugger because the edges were buried in the dirt and you can't just pull up the plastic without the edges tearing off.  The walk behind plow seemed just the ticket for getting those edges loose.  Ellen led our big mare along the edge of the plastic so I didn't have to fight the plow over.