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Ayi, N. A. and Undiandeye, U. C. (2022) EFFECTIVENESS OF FARMER FIELD SCHOOL ON THE PRODUCTIVITY OF CASSAVA FARMERS IN CALABAR AGRICULTURAL ZONE, CROSS RIVER STATE, NIGERIA. International Journal of Agricultural Extension and Rural Development Studies, 9 (1). pp. 19-37. ISSN 2058-9093(Print), ISSN 2058-9107(Online)