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nigeria fertilizer rice agricultural transformation agenda udp food security agriculture agricultural technology agricultural credit value chain development social networks agricultural growth msu rice competitiveness ata rice economy domestic rice economy policy analysis domestic agriculture irrigation west african food security nutrition staple crops micronutrients biofortification randomized control trial rct agricultural production fertilizer profitability international agricultural research sustainable agriculture gisaia research networks economic development private sector input access private sector growth agricultural inputs land governance inputs seeds capacity assessment agricultural policy community-driven development local research networks fadama iii comparative advantage caadp