@ARTICLE {KAPINGA:1995, title = {Soil N, P, and land use efficiency under cassava / sweet potato intercropping system in Tanzania}, author = {Kapinga, R. and Omueti, J. A. and Ekanayake, I. J. }, journal = {African Journal of Root and Tuber Crops}, year = {1995}, volume = {1}, number = {1}, pages = {14--19}, note = {RTB; Root and Tuber}, }