Physiological quality of cowpea bean (Vigna unguiculata L. Walp.) seed by the electrical conductivity and germination testing অনুযায়ী Araméndiz-Tatis, Hermes, Cardona-Ayala, Carlos, Espitia-Camacho, Miguel, Peña-Salgado, Luisa, Doria-Pérez, Tatiana