Not addressing a specific instance but it general there is a strong defense related reason for this kind of thing.

There are a couple things which are essential for a country to produce themselves so they can survive and fight in the event of war. Food, energy, steel etc... It's essential that we are a net exporter of food. To this end it is reasonable that government would offer a minimum price on which they would buy food and destroy it in order to maintain production. This only really happens when supply lines are disrupted as happened in 2020.