Urea-ka: replacing inorganic nitrogen fertilizer with Azolla pinnata maintains rice yields with reduced input costs in the Senegal River Valley by Xorla S. Ocloo, Moussa Mbaye, Abou Sy Dit Tid Mouline Counta, Gonzalo M. Vazquez-Prokopec, Nicolas Jouanard, Momy Seck, Silvain Leonard Thierry Sow, David J. Civitello

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