Effect of nitrogen fertilizer treatments on duration of senescense, harvest time and yield in some varieties of cowpea (Vigna unguiculata (L.) Walp)

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Mohammad M.
Department of Biological Sciences, Federal University, Dutse, Jigawa State, Nigeria.
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Mukhtar F. B.
Department of Biological Sciences, Bayero University, Kano, Kano State, Nigeria.
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