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A new single cross hybrid, umechal is a white waxy corn (Zea mays L.) developed by the Maize Experiment Sta-tion(MES) of Gangwondo Agricultural Research and Extension Services (GARES) in Hongcheon in 1999. umechalwas madeby crossing two inbred lines, the seed parent, HW1, and the polen parent, KW7, which were developed by MES and the NationalCrop Experiment Station (NCES), respectively. Both of them came from Korean local varieties and were advanced to 7 generationsby ear-to-row method. The silking date is a week later than that of check hybrid, Chalok 1. Ear length (18.8 cm) was longer thanthat (16.3 cm) of Chalok 1. Plant and ear heights were higher than those of Chalok 1. umechalalso had greater lodging resis-tance. Grain qualities and panel test of umechalshowed intermediate to Chalok 1 and Chalok 2. Number of fresh ear and earweight were 6,164 ears/10a and 1,018 kg/10a, respectively, in Gangwon regional yield trial. In the nationally performed regionalyield trial, umechal was 1% higher in ear number than Chalok 1 and 4% higher than Chalok 2. As for ear weight, umechalwas 19% higher in ear weight than Chalok 1 and 30% higher than Chalok 2.

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