What is primitive subsistence agriculture

Primitive Subsistence Farming: Shifting cultivation and nomadic herding come under this type of farming.
Shifting Cultivation: In shifting cultivation, a small patch of land is cleared by felling the trees and burning them. Then the ashes are mixed with the soil and seeds are broadcast. After a couple of years, the patch of the land is left fallow and the farmer moves on in search of a new patch of land. Shifting cultivation is practiced in thickly forested areas of Amazon basin, tropical Africa, parts of southeast Asia and Northeast India.
Nomadic Herding: In this type of farming, cattle, sheep, goat and camel are reared. The herdsmen move from place to place with their animals in search of new pastures. Nomadic herding is practiced in the semi-arid and arid regions of Sahara, Central Asia and some parts of India (like Rajasthan and Jammu & Kashmir).