Section 12. Determination of Lease Rentals. —

In order to protect and improve the tenurial and economic status of the farmers in tenanted lands under the retention limit and lands not yet acquired under this Act, the DAR is mandated to determine and fix immediately the lease rentals thereof in accordance with Section 34 of Republic Act No. 3844, as amended: Provided, That the DAR shall immediately and periodically review and adjust the rental structure for different crops, including rice and corn, or different regions in order to improve progressively the conditions of the farmer, tenant or lessee.