Demand-Driven Technologies for Sustainable Maize ... - IITA

152in the top 0-15 cm layer and also contributed to higher grain yield.Application of 90 kg N ha -1 to maize grown after soybean may not beeconomical to all cultivars. Therefore, future studies should focus onwider range of fertilizer rates and roles of cultivar characteristics. In thisstudy, TGx 1448-2E may be recommended for low-income farmersbecause when grown in rotation with maize, the subsequent maizemay not require a high amount of fertilizer N to produce reasonableyield.AcknowledgementThis research was funded by the International Foundation for Science (IFS)under research grant No. C/3476-1 for the fi rst author. The authors aregrateful to Messrs U.O. Bello, A. Jibrin and I. Ibrahim of the Department ofSoil Science, Ahmadu Bello University, Zaria, for their technical assistance onthe fi eld and in the laboratory.ReferencesAdeoye, K.B., 1986. Physical changes induced by rainfall in the surface layerof an alfi sol, northern Nigeria. Geoderma 39:59–66.Adeoye, K.B. and M.A. Mohammed-Saleem, 1990. Comparison of effects ofsome tillage methods on soil physical properties and yield of maize andstylo in a degraded ferruginous tropical soil. Soil and Tillage Research 18:63–72.Ae, N. and T. Otani, 1997. The role of cell wall components from groundnutroots in solubilizing sparingly soluble phosphorus in low fertility soils.Pp 309–314 In T. Ando et al. (eds.) Plant nutrition for sustainable foodproduction and environment. Developments in Plant and Soil Sciences.Kluwer Academic Publishers, Dordrecht, The Netherlands.Agbenin, J.O. and J.T. Goladi, 1997. Carbon, nitrogen and phosphorusdynamics under continuous cultivation as infl uenced by farmyard manureand inorganic fertilizers in the savanna of northern Nigeria. Agriculture,Ecosystems and Environment 63: 17–24Allison, L.E., 1965. Organic carbon. Pp 1367–1378. In C.A. Black et al. (eds.)Methods of soil analysis. Part 2. Agroomy. Monograph 9. American Societyof Agronomy, Madison, Wisconsin, USA.Alvey, S., M. Bagayako, G. Neumann, and A. Buerkert, 2001. Cereal/legumerotation effects affect chemical properties and biological activities in twoWest African soils. Plant and Soil 231: 45–54.Bala, A., A.O. Osunde, A. Muhammad, J.A. Okogun, and N. Sanginga,2003. Residual benefi ts of promiscuous soybean to maize in the southernGuinea savanna of Nigeria. Nigerian Journal of Soil Science 13: 7–20.Bationo, A., E. Rhodes, E.M.A. Smaling, and C. Visker, 1996. Technologiesfor restoring soil fertility. Pp 61–82 In: A.U. Mokwunye, A. de Jager,