Determination of Seeding Date and Seedling Age in Raising Seedling using Automatic Facility

벼 자동화 육묘시설에서 적정 파종기와 묘대기간의 선정

The purpose of this study was carried out to determine the optimum sowing date and days after sowing (DAS) in automatic facility located at Uiseong of Gyeoungbuk province. The seedling height was rapidly increased with a delay of sowing time from April to May. The 10-day old seedlings with suitable plant height (> l0cm) for machine transplanting in the facility were obtained when the seeds sowed after May 20 at Uiseong in Gyeoungbuk province. The dry weight-height ratio of 10-day old seedlings was significantly decreased when the seeds sowed after June 20, and 15-days old seedlings did after May 10. No. of panicles/hill was reduced with increasing of days after seeding. But there were no significant difference among other yield components such as no. of grains/panicle, ratio of ripened grains, and 1,000 grain weight. The highest grain yield, 748kg/10a, was attained from the 10-day old seedlings transplanted at May 27 in comparision with those of 15-day and 20-day old seedlings. The grain yield of 10-day old seedlings transplanted at June 26 was also higher than that of 15-day old seedlings.

경상북도 의성지역의 벼 자동화 육묘시설에서 파종기별 적정 묘대기간을 선정하기 위하여 실험한 결과를 요약하면 다음과 같다. 파종기가 늦어지고 육묘일수가 길어질수록 묘초장은 증가하였다. 의성지역에서 이앙 가능한 묘초장 10cm 이상을 확보하기 위해서는 10일묘는 5월20일, 15일묘는 5월5일이 파종적기로 나타났다. 묘충실도는 파종기가 늦어지고 육묘일수가 길어질수록 불량해졌는데, 10일묘의 경우는 6월 20일 이후, 15일 묘는 5월 10일 이후 파종에서 각각 묘충실도가 크게 나빠지는 경향이었다. 주당수수는 육묘기간이 길어질수록 감소하였고, 수당립수, 등숙률 및 천립중은 일정한 경향이 없는 것으로 나타났다. 1모작인 5월 하순 이앙구의 정조수량은 10일묘에서 748 kg/10a로 가장 높았고 묘대일수가 길어질수록 감소하였으며, 2모작인 6월 27일 이앙구에서도 10일묘를 이앙했을 때 수량성이 가장 높았다.