![](https://www.nsl.ethz.ch/wp-content/uploads/2020/10/0042-1_Plan_Wahlen.jpg)
The content of the film is only available in German and French.
During the Second World War, the so-called Wahlen Plan provided for the expansion of agricultural land to 500,000 hectares to secure the food supply. The minimum area of crop-rotation land established in 1992 in accordance with the respective Federal order amounts to 438,560 hectares.