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Optimal Transplanting Time for 'Saemimyeon' Production in Youngnam Province

영남지방에서 쌀면용 새미면 최대생산을 위한 이앙적기 설정

  • Bae, Hyun Kyung ;
  • Hwang, Jung Dong ;
  • Seo, Jong Ho ;
  • Kim, Sang Yeol
  • 배현경 ;
  • 황정동 ;
  • 서종호 ;
  • 김상열
  • Received : 2018.05.07
  • Accepted : 2018.06.27
  • Published : 2018.09.30

Abstract

'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 $30{\times}12cm$. 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 $21{\sim}25^{\circ}C$ and the estimated optimal temperature was $24^{\circ}C$, 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.

Keywords

high yielding rice;optimal grain filling temperature;rice noodles;transplanting time

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Acknowledgement

Grant : 벼, IRG 2·3 모작 작부체계에서 미질 특성 연구

Supported by : 농촌진흥청