Phanthavong V, Viengsakoun N, Sangkhom I and Preston T R 2015: Effect of biochar and leaves from sweet or bitter cassava on gas and methane production in an in vitro rumen incubation using cassava root pulp as source of energy. Livestock Research for Rural Development. Volume 27, Article #72. Retrieved , from http://www.lrrd.org/lrrd27/4/phan27072.html