Nitrogen contribution of some selected legumes to a sorghum based cropping system in the southern Guinea savanna of Nigeria
Usman A.1*, Osunde A. O. 2 and Bala A.3
1National Cereals Research Institute Badeggi, P.M.B. 8, Bida, Niger State. Nigeria.
2Department of Soil Science, School of Agriculture and Agricultural Technology, Federal University of Technology Minna, Niger State. Nigeria.
3International Institute of Tropical Agriculture, Kano, P.M.B 3112, Kano, Nigeria.
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