“ON-FARM FARMERS’ PARTICIPATORY EVALUATION OF THE IMPACT OF POSITIVE SELECTION ON SEED TUBER YAM ( Dioscorea Rotundata Poir) PRODUCTION FROM TWO SOURCES IN EBONYI SOUTHEASTERN NIGERIA”. Global Journal of Advanced Engineering Technologies and Sciences 5, no. 8 (August 10, 2018): 25–33. Accessed November 22, 2024. https://gjaets.com/index.php/gjaets/article/view/105.