Question

why culti vators are unwilling to grow opium

Answer 1

were well manured. On this land, villagers usually produced pulses. If they planted opium on this land, pulses could not be grown there.
Many cultivators owned no land. To cultivate, they had to pay rent to the landlord for the lease land. And the rent charged on good land near the villages was very high.
The cultivation of opium was a difficult process. The plant was delicate and the cultivators had to spend long hours in nurturing it.
The price government paid to the cultivators for opium was very low. It was unprofitable for cultivators to grow opium at that price.

Answer 2

Because it destroys the soil quality after 2 to 3 times cultivation.Which is harmful for soil.