Once you learn what it is, shifting agriculture is a really obvious concept that makes a lot of sense. Basically, if you plant the same crop on a plot of land year after year, the soil becomes depleted of nutrients, specifically the nutrients most needed by the crop. So, as a means of long-term sustainability of land, farmers rotate the plots with different crops, and every few years the plot will remain empty (so it can “rest” and regain nutrients). For instance, a farmer has 3 plots. This farmer lives in Iowa (haha) so he plants corn and soybeans. Each plot of land has corn planted on it once every 3 years, as it rotates around between soybeans and barren.
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