Agricultural research in Ghana: An IFPRI-STEPRI report - van Rheenen, Teunis; Obirth-Opareh, Nelson; Essegbey, George Owusu; Kolavalli, Shashidhara; Ferguson, Jenna; Boadu, Paul; Masahudu, Fuseni; Chiang, Catherine (International Food Policy Research Institute, 2012)