The tool shown here is a row/bed marker that is rolled out before direct seeding or transplanting. There are two versions documented - a hand-pushed model and a rear tractor-mounted model. It's purpose is to quickly make a grid that marks row spacing (three rows in this version) as well as your desired in-row spacing (hand-pushed model marks every 4 inches, tractor-mounted model marks every 12 inches). The purpose of this tools to allow one to quickly seed and transplant on a grid for easy cultivation and harvesting. This system also facilitates in keeping track of yields / plants per bed.