Rodrigues, M.A.Coutinho, João2011-02-042011-02-041996Rodrigues, Manuel; Coutinho, João (1996). Efficiency of uptake and utilization of N from mineral and organic sources by potato crop. In Proceedings of 4th ESA – Congress. Wageningen. ISBN 9073384435http://hdl.handle.net/10198/3276This work study the relationship among N applied, N uptake and tubers yield. Several indices related to N use efficiency were also estimated and its economical aspects considered.engconference object