Onyemekonwu, R. C., Chisonum, M., Onyemekihian, F. PRODUCTIVITY FACTOR AND CONSTRAINTS ASSOCIATED WITH YAM FARMING AMONG SMALLHOLDER FARMERS IN DELTA STATE, NIGERIA. njaat [Internet]. 2023 Dec. 26 [cited 2025 Oct. 3];3(2):110-8. Available from: https://www.njaat.com.ng/index.php/njaat/article/view/544