(a) Cash lease. If a rental agreement contains provisions for a guaranteed minimum rental with respect to the amount of rent to be paid to the landlord by a tenant, such agreement shall be considered to be a cash rental agreement. In addition, the rental agreement must be customary and reasonable for the area.

(b) Share lease. If a rental agreement contains provisions that require the payment of rent on the basis of the amount of the crop produced or the proceeds derived from the crop, such agreement shall be considered to be a share rental agreement. In addition, the rental agreement must be customary and reasonable for the area.