The Challenge of Improving Soil Fertility in Yam Cropping Systems of West Africa by Emmanuel Frossard, Beatrice A. Aighewi, Sévérin Aké, Dominique Barjolle, Philipp Baumann, Thomas Bernet, Daouda Dao, Lucien N. Diby, Anne Floquet, Valérie K. Hgaza, Léa J. Ilboudo, Delwende I. Kiba, Delwende I. Kiba, Roch L. Mongbo, Hassan B. Nacro, Gian L. Nicolay, Esther Oka, Yabile F. Ouattara, Nestor Pouya, Ravinda L. Senanayake, Ravinda L. Senanayake, Johan Six, Orokya I. Traoré

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