N and P dynamics in Quesungual Slash and Mulch Agroforestry System (QSMAS) - Castro, A.; Barrios, E.; Ayarza, Miguel Angel; Asakawa, N.; Borrero, Gonzalo; Menjívar, J.C.; García, E.; Rao, Idupulapati M. (International Center for Tropical Agriculture, 2006)