FARMERS’ PERCEPTION ABOUT QUALITY OF PLANTED SEED YAM AND THEIR PREFERENCES FOR CERTIFIED SEED YAM IN GHANA Journal title: International Journal of Food and Agricultural Economics Authors: Paul Boadu, Robert Aidoo, Kwasi Ohene-Yankyera, Ulrich Kleih, Tahirou Abdoulaye, Norbert Maroya, Joh... Subject(s): Agricultural Economics