Effects of Brachiaria grass cultivars on soil microbial biomass carbon, nitrogen and phosphorus in soils of the semi arid eastern Kenya - Gichangi, Elias M.; Njarui, Donald M.G.; Gatheru, M.; Ndung'u-Magiroi, Keziah Wairimu; Ghimire, Sita R. (Kenya Agricultural and Livestock Research Organization, 2016)