KURA, ZANNA ABBA, UMAR, MARYAM IBRAHIM, LAWAN, AISHA. GROWTH AND MARGINAL BENEFIT OF ONION (Allium cepa L.) PRODUCTION UNDER DIFFERENT RATES OF NITROGEN AND FARM YARD MANURE IN MAIDUGURI SUDAN SAVANNA, NIGERIA. TIJARBT. 2025;9(1). doi:10.70382/tijarbt.v09i1.018