On-farm evaluation of improved cowpea-cereals cropping systems for crop-livestock farmers: Cereals-cowpea systems in Sudan savanna zone of Nigeria
Hakeem .A. Ajeigbe1*, Bir .B. Singh2, Innocent .E. Ezeaku1 and James .O. Adeosun3
1International Institute of Tropical Agriculture (IITA), Kano Station, P. M. B. 3112, Kano, Nigeria.
2Department of Soil and Crop Sciences, Texas A&M University College Station, Texas 77843, U. S. A.
3National Agricultural Extension, Research and Liason Services, Ahmadu Bello University, Zaria, Nigeria.
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