Cheonsu is a new japonica rice cultivar tolerant to drought. This cultivar was developed from the cross Ilmibyeo// Juanbyeo/Salshare, where the parent Ilmibyeo is a japonica cultivar with high eating quality, Juanbyeo is a japonica for direct-seeding cultivation, and Salshare is a japonica weedy rice from Korea. The preliminary and replicated yield trail on Cheonsu was carried out at Yeungnam University in 2001, 2002 and 2003, and the local adaptability test was carried out by the National Seed Management Office (NSMO), Korea, in 2004 and 2005. This cultivar was registered to NSMO, Korea, as variety Cheonsu in 2006. Cheonsu has about 122 days growth duration from transplanting to harvesting. This cultivar has stature with 81cm of culm length. The milled rice yield of Cheonsu is about 5.10 MT/ha under standard fertilizer level of the ordinary transplanting cultivation. Amylose content of this cultivar is 18.3%.

• Hak Soo Suh
• Dong Sun Lee
• Li Juan Chen
• Sung Soo Kim
• Jae Youn Jung
• Sang Gu Kang