A New Single Cross Maize Hybrid Cultivar, ＂Jangdaok＂ for Grain and Silage

Abstract

A single cross, Jangdaok, is an yellow dent maize hybrid (Zea mays L.) developed by the maize breeding team at the National Institute of Crop Science (NICS), RDA in 2003. This hybrid, which has a high yield of dry matter, total digestible nutrients (TDN) and grain, was produced by crossing two inbred lines, KS5 and KS135. KS5 is the seed parent, and KS135 is the pollen parent of Jangdaok. Silking date of Jangdaok is three days earlier than that of check hybrid, Kwanganok. It is resistant to lodging because of its low ratio of upper ear height to plant height. Stay-green of Jangdaok do not differ greatly with that of Suwon19. It has a longer ear than a check hybrid, Kwanganok. It is moderately resistant to Bipolaris maydis (southern corn leaf blight), Exserohilum turcicum (northern corn leaf blight), and corn borer but sensitive to black streaked dwarf virus (BSDV). Regional yield trial was conducted at four locations for two years. The yields of Jangdaok in dry matter, TDN, and grain were 17.7ton, 12.7ton and 9.2ton/ha, respectively, which were increased 6% and 8% compared with a check hybrid, Kwanganok, and 9%, compared with Suwon19. Seed production of Jangdaok has gone well due to a good match during crossing between the seed parent, KS5 and the pollen parent, KS135.