The textbook context clearly describes Rinjha's family practicing 'slash and burn' agriculture - they clear a patch of land for cultivation, and when soil fertility declines, they shift to a fresh patch of land. These are the defining characteristics of Primitive Subsistence Farming. Since the family lives in Assam (Diphu), this type of farming is specifically called 'Jhumming' in the north-eastern states. The context explicitly states that this farming depends on monsoon, natural fertility of soil, and uses primitive tools with family labour.