Flurzwang is the German term for the obligation to participate in open field cultivation in Europe in former times. The owners of farmland and the lord of the manor ordered the cultivation of individual pieces of agricultural land in the community in areas using the three year crop rotation system, which was used between the late Middle Ages until about the middle of the 19th century, or even much longer in some places. It typically resulted in dispersal of the ownership of property over the entire land of the community, the so-called Gemengelage.