Tesfay A, Estifanos A, Wayu S, Tesfay T and Baraki A 2015: Rehabilitation of degraded pasture land through application of urea and slurry: the case of Ayba pasture land, southern Tigray, Ethiopia. Livestock Research for Rural Development. Volume 27, Article #186. Retrieved , from http://www.lrrd.org/lrrd27/9/tesf27186.html