s:246:"%T Spatial variability of soil nutrients in wetland and its influence on rice yield in Rwanda %A Nabahungu, N.L. %A Musana, S.B. %A Kagabo, D.M. %A Cyamweshi, R.A. %A Tuyisenge, J. %A Chuma, A. %A Gahakwa, D. %A Mukuralinda, A. ";