How does Jhum cultivation promote deforestation?

Trees are axed for timber, firewood, cattle raching and several other puposes. It is called slash and burn agriculture, commonly called as Jhum cultivation in the north eastern states of India, it has also contributed to deforestation. In slash-and-burn agriculture, the farmers cut down the trees of the forest and burn the plant remains. The ash is used as a fertlizer, and the land is used for farming or cattle grazing.