The release of two new potato (Solanum tuberosum L.) cultivars with different maturing characteristics, Haryeong and Jayoung, necessitates the development of appropriate electrical conductivity (EC) recommendations for the nutrient solutions used in hydroponic seed potato production. The two cultivars, along with the standard cultivar, Superior, were grown with four nutrient solutions differing in EC (0.6, 1.2, 1.8, and 2.4 dS m −1 ). The EC of nutrient solution did not influence photosynthetic rate (Pr) or water use efficiency (WUE) of leaves, whereas it affected total chlorophyll content, transpiration rate (Tr), and stomatal conductance (Sc) in some cultivars, highest at 0.6 dS m −1 EC for Tr and Sc, and lowest at the same EC for total chlorophyll content. The nutrient content of shoots was significantly affected by ECs of the nutrient solution. The total-N content was higher in 2.4 dS m −1 EC, whereas a lower P, Ca, and Mg content was measured in plants grown at the same EC. Plants grown with a lower EC had inhibited shoot and stolon growth and earlier tuber formation compared to those grown with higher ECs. For the 0.6 dS m −1 EC treatment, tubers were first observed on days 40, 50, and 52 for cvs. Superior, Haryeong, and Jayoung, respectively. For higher EC treatments, tubers were observed 5 to 6 days later, particularly for the new cultivars. At harvest, the number of tubers produced from Superior and Jayoung plants was not affected by EC, whereas those of Haryeong increased at 1.8 dS m −1 EC. The results suggest that potato cvs. Superior and Jayoung are able to grow at a wide range of solution EC levels, but that the new cultivar Haryeong needed optimal management of solution EC at 1.8 dS m −1 to yield higher tuber production under an aeroponic cultivation system.Resumen La liberación de dos nuevas variedades de papa (Solanum tuberosum L.) con características diferentes de maduración, Haryeong y Jayoung, requiere del desarrollo de recomendaciones apropiadas de conductividad eléctrica (EC) para las soluciones nutritivas usadas en la producción de semilla de papa hidropónica. Las dos variedades, junto con la estándar, Superior, se cultivaron con cuatro soluciones nutritivas que diferían en EC (0.6, 1.2, 1.8, y 2.4 dS m −1 . La EC de la solución nutritiva no influenció el nivel fotosintético (Pr) o la eficiencia en el uso del agua (WUE) de las hojas, mientras que sí afectó el contenido total de clorofila, el nivel de transpiración (Tr) y la conductancia estomatal (Sc) en algunas variedades, con la más alta a 0.6 dS m −1 EC para Tr y Sc, y la mas baja a la misma EC para el contenido total de clorofila. Se afectó significativamente el contenido de nutrientes en tallos por las ECs de la solución nutritiva. El contenido total de N fue más alto en 2.4 dS m −1 de EC, mientras que se detectó un contenido más bajo de P, Ca y Mg en plantas cultivadas a la misma EC. Las plantas en un EC más bajo tuvieron inhibición en el crecimiento de tallo y estolón y formación más temprana de tubérculo comparadas con aquellas que e...

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A new F1 hybrid variety, 'Daekwanhwang', using a male sterile line was developed in Highland Agriculture Research Center (HARC), Rural Development Administration (RDA) at 2007. The cross was made between a male sterile line 'Manchuhwang' as a female parent and NIHA-5001 as a male parent in 2001. It was preliminarily selected as 'NIHA-GA-1' and advanced field trial was performed in 2003. Regional yield trial was carried out at three different highland areas from 2004 to 2006. The plant growth habit is erect and intermediate in plant shape and maturity, respectively. It grows 74.cm in height and has 8.5 number of leaves each plant. The average bulb weight of 'Daekwanhwang', was similar to that of commercial F1 hybrid 'Higuma' and bulb shape is oval. The skin color is yellowish brown and the storability is longer than that of 'Higuma'. Soluble solid contents and dry matter were higher than those of commercial F1 hybrid cultivar,'Higuma'