the land planted with cane remained covered by the tenant’s lease from before the emir assumed possession until he relinquished it, does the lease cease to have legal effect, or does it remain in force?

He replied:

A lease of the land granted by its land-grant holder is valid, and he may lease it to someone who will cultivate cane or other crops. Likewise, his tenant may sublet it to someone else under the terms of his own lease.

If that land-grant holder dies or his grant is reassigned, the new holder is not bound by the former holder’s lease. However, he may not uproot the tenant’s crops and cane without compensation. Rather, he has the option of allowing the tenant’s crops and cane to remain at a newly agreed rent, whether equal to, lower than, or higher than the original rent, as the two parties mutually agree. He may not, however, compel the tenant to pay more than the fair rental value.

If the owner of the cane and crops leases the land, the lease is valid, since he is able to benefit from it. If someone else leases it, that too is permissible according to the correct view. That person then takes the lessor’s place: he may allow the crops and cane to remain in return for the fair rental value, or he may lease the land to their owner with his consent.

And Allah knows best.