Genotype x environment interaction effect on grain yield of cowpea (Vigna unguiculata (L.) Walp) in Deciduous forest and Sudan savanna ecologies of Ghana. by Francis Kusi, Richard Adu Amoah, Patrick Attamah, Shaibu Alhassan, Damba Yahaya, Justice Frederick Awuku, Jerry A Nbonyine, Isaac Amegbor, Gloria Mensah, Issah Sugri, Mukhtaru Zakaria, Salim Lamini, Peter Asungre, Emmanuel Asibi Aziiba, Julius Yirzagla, Emmanuel Boamah Duku, Daniel Ashie Kotey, Isaac Asante

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