Research Article
Agronomic Efficiency of Cowpea Varieties (Vigna unguiculata L. Walp) under Varying Phosphorus Rates in Lafia, Nasarawa State, Nigeria
Department of Agronomy, Nasarawa State University, P.M.B. 1022, Keffi, Nigeria
A. Usman
Department of Plant Science, Ahamadu Bello University, Samaru-Zaria, Nigeria