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2020. COWPEA [ VIGNA UNGUICULATA (L.) WALP.] CROPPING SYSTEMS MAPPING AND FARMERS’ PERCEPTION ON SOIL FERTILITY IN BENIN: N. F. ANAGO.*, G. D. DAGBENONBAKIN **, E. C. AGBANGBA**, T. C. B. OUSSOU **, F. CHABI *, A. SAIDOU * & G. L. AMADJI *. Annales des Sciences Agronomiques. 20, 1 (janv. 2020), 65–77. DOI:https://doi.org/10.2023/sf2p7n55.