Shifting cultivation
Farming in which a plot is cleared, cropped for a few years, then left to regrow while the farmer moves to another plot.
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Farmers clear a patch of forest, often by cutting and burning, and plant mixed crops. After one to three harvests the soil tires, so the plot is rested for years and the forest returns. When resting periods are long enough the method can be sustainable. 'Slash-and-burn' describes the same practice but is often used as a criticism.