Why do people who practise slash and burn agriculture shift to another place after a few years?

Q. Why do people who practise slash and burn agriculture shift to another place after a few years?

Q. A farmer has a large agricultural land and the people who helped him prepare the soil for his land quit. What do you suggest he should do so that he could prepare the soil on time?

Q. Read the following statements (I - III) related to slash and burn agriculture and select the correct statements ?

I. In this type of cultivation, the patch of land once cultivated is not used for agriculture again.
II. Due to loss of fertility in the soil the cycle of cultivation in subsequent years becomes less.
III. It is responsible for deforestation.

Q. Why is the tree-less patch of land burnt in slash and burn agriculture?

Q. The people of the Amazon practise ________________ agriculture.