@BOOK {KANG: 1985c, title = {Nitrogen management in farming systems in humid and subhumid Tropics}, editor = {Kang, B. and van der Heide, J. }, booktitle = {Proceedings of Symposium on Nitrogen Management in Farming System In Humid and Subhumid Tropics, held at the International Institute of Tropical Agriculture (IITA)}, year = {1985}, note = {Ibadan, Nigeria, October23-26,1984. Haren, The Netherlands, IITA and Institute for Soil Fertility, 365p}, }