Analysis of the technical efficiency of yam cultivation (Dioscorea spp.) in the Caribbean Region of Colombia by Martínez-Reina, Antonio María, Tordecilla-Zumaqué, Lilibet, Grandett-Martínez, Liliana María, Regino-Hernández, Sol Mara, Luna-Castellanos, Lily Lorena, Pérez-Cantero, Shirley Patricia