How big is the potato (Solanum tuberosum L.) yield gap in Sub-Saharan Africa and why? A participatory approach von Harahagazwe, Dieudonné, Condori, Bruno, Barreda, Carolina, Bararyenya, Astère, Byarugaba, Arinaitwe Abel, Kude, Danbaba Anthony, Lung’aho, Charles, Martinho, Carolino, Mbiri, Daniel, Nasona, Bouwe, Ochieng, Bruce, Onditi, John, Randrianaivoarivony, Jean Marc, Tankou, Christopher M., Worku, Alemu, Schulte-Geldermann, Elmar, Mares, Victor, Mendiburu, Felipe de, Quiroz, Roberto Quiroz

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