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 “Boseog” is a new japonica rice cultivar developed from the three way cross of Kinuhikari//HR19621AC6/Sobibyeo and registered by the rice breeding team of Department of Rice and Winter Cereal Crop, NICS, RDA in 2008. This cultivar has about 110 days of growth duration from transplanting to harvesting in northern plain, northern and southern mid-mountainous area of Korea. This cultivar is about 72 cm in culm length and tolerant to lodging. In the reaction to biotic and abiotic stresses, it shows resistance to leaf blast, but susceptibility to bacterial blight, virus diseases and insect pests. The milled rice of “Boseog” exhibits translucent, relatively clear non-glutinous endosperm and midium short grain. It has similar amylose content(18.0%), lower protein content(6.3%), and similar palatability of cooked rice compared to Odaebyeo. The milled rice yield of this variety is about 5.03 MT/ha in local adaptability test. “Boseog” would be adaptable for ordinary transplanting in northern plain, mid-mountainous and southern mountainous area of Korea.