Ala. Code § 2-6-85

All securities issued by the corporation and any redemption premium and any interest thereon, the properties of the corporation and any income realized from rents or leases obtained from operation of any market facility constructed under the provision of this article, or any income realized from rents or leases from any source or business under the control of the Agricultural Center Board, and all instruments which may be filed for record pertaining to the pledge and lien authorized by this article to be created, shall be exempt from all taxation in the state.