NuhuY., MukhtarF.B., MohammedI.B., AliyuB.S. and NamadinaM. 2023. RESPONSE OF SOME COWPEA VARIETIES (Vigna unguiculata L.) YIELD TO VARIATIONS IN DAYLENGTH IN SUDAN SAVANNA OF NIGERIA. FUDMA JOURNAL OF SCIENCES. 3, 1 (Mar. 2023), 179 - 188.