The Korean Journal of Crop Science ISSN:0252-9777(Print) 2287-8432(Online) 한국작물학회지

‘Saemimyeon,’ a Tongil-type rice variety (Indica x Japonica), containing high amylose content, is suitable for rice noodle production. Currently, the major parts of the rice processing industry that include products such as rice flour and noodles are expected to partially replace the wheat flour market. The volume of the rice noodle market is growing and can contribute to the rice surplus problems and farmer’s income. This study was carried out to promote productivity of ‘Saemimyeon’ by finding the most suitable transplanting times in Youngnam Province. The transplanting times were May 10^th, May 17^th, May 24^th, May 31^th, June 7^th, and June 14^th and the planting distance was 30 × 12 cm. The field experiment was conducted in the Miryang region (southern plain region of Korea) from 2015 to 2017. Our results suggested that the optimum transplanting dates were from May 17^th to May 31^th, which resulted in an average yield of 750 kg/10 a. The average grain filling rate before May 31^th was more than 83% and it declined to 75% after June 7^th. The average temperature range from heading to harvesting time was 21~25°C and the estimated optimal temperature was 24°C, which is similar to that of May 24^th by regression equation. It is suggested that low temperature at seed maturation time caused the lower grain filling rate, and therefore ‘Saemimyeon’ needed to be transplanted before May 31^th for higher productivity. Estimated optimal transplanting time based on temperature was 1 ~ 2 weeks earlier than the optimum transplanting time for common japonica rice cultivars in Youngnam Province.