Jonathan S, Adebayo EF, Joseph M, Tarki SK. PRODUCTIVITY MEASUREMENTS IN SOLE COWPEA FARMING: A CASE STUDY OF NORTHERN AGRICULTURAL ZONE OF ADAMAWA STATE, NIGERIA. IJGARD [Internet]. 2023 Oct. 12 [cited 2024 Nov. 8];1(1):97-103. Available from: https://ijgard.com/index.php/ijgard/article/view/12