Is the zakat on cultivated land to be paid based on the tenth (tithe) or in cash?

Zakat is obligatory on the rent of land or real estate if a complete year (hawl) has passed over it and it has reached the minimum threshold (nisab), and its amount is one-quarter of one-tenth (2.5%). As for the one-tenth (ushr), it is obligatory on the owner of the grain or fruit grown on the land, not on the owner of the rented land.