Question

The trees are first burnt and tjen the crop is grown in

Answer 1

Answer:

slash and burn agriculture...

Explanation:

in this agriculture they cultivate the crop in one part of the field and when it's soils fertility becomes low they burn that patch of land and go into other patch for growing crops.the main and vantage if this is the fertility of the soil gets replenishes naturally i.e., there is no use of fertilisers or any chemicals...