What is slash and burn agriculture?

In this farmers clear a patch of land and produce cereals and other crops to sustain their family, when the soil looses its fertility, the farmers shift and clear a fresh patch of land for cultivation. Nature replenishes the fertility of soil through natural processes. Land productivity in this type of agriculture is low, because the farmers do not use fertilizers or other modern inputs. It is generally known as shifting agriculture, but also known in different names in different parts of the country.