Kassim, A., Ohene-Yankyera, K. and Oduro, F. 2016. Optimal rice/colocasia cropping systems in the Ashanti, Eastern and Central regions within the semi-deciduous forest zone of Ghana. Journal of Science and Technology. 27, 2 (Feb. 2016). DOI:https://doi.org/10.4314/just.v27i2.652.