1. Chungnam-do Agricultural Research & Extension Service, Gongju Chungnam 323-814. Korea
2. Substratus Korea 648-6 Sungdong, Gimjesi Jeonbuk 576-090, Korea
3. Department of Plant and Food Sciences, Sangmyung University, 31 Sangmyunddae-gil, Cheonan, Chungnam 330-720, Korea
4. GyeongGi-Do Agricultural Research & Extension Services, Hwasung-si 445-300, Korea