벼 착근기 생육 환경에 따른 어린모의 생육변화 분석 = Changes in the Growth of Young Rice Seedlings in the Root Extension Stage under Different Growth Conditions

다국어 초록 (Multilingual Abstract)

Root extension is the most important growth change that occurs during cultivation. We analyzed growth changes according to young seedling age, temperature, and the degree of root cutting in order to identify factors affecting rooting after transplanting. Root cutting did not affect plant height growth rate, root growth rate was increased in plants that experienced root cutting, and 14-day-old seedlings exhibited a higher growth rate than 7-day-old seedlings. Growth temperature experiments revealed that elongation was high at 25°C and 28°C, but tended to be low at 18°C, and root elongation was high at 22–28°C for 7-day-old seedlings and 22–25°C for 14-day-old seedlings. Nitrogen absorption decreased in the following growth temperature order: 25, 28, 22, 18°C, and differences in nitrogen absorption under different growth temperatures tended to be lower in 7-day-old seedlings. The amount of nitrogen taken up by roots did not differ significantly between the short root treatment and the control, and 7-day-old seedlings tended to start nitrogen absorption faster than 14-day-old seedlings. Root vitality was highest in short-rooted 7-day-old seedlings with 3 cm of root remaining, and vitality also tended to be high in short-rooted 14-day-old seedlings.

국문 초록 (Abstract)

착근은 이앙재배에서 가장 중요한 생육상의 전환으로 착근의 효율에 따라 이앙 후 수량 및 품질에 큰 영향을 미치는 중요한 시기이다. 착근 시 식물체 조건 및 환경에 따른기초연구가 부족하여 이에 착근에 영향을 미치는 요인을구명하기 위해 생육일수, 생육온도 및 단근정도에 따른 모의 생육변화를 분석한 결과는 다음과 같다.
1. 단근 처리 시 초장변화는 단근처리에 따른 차이를 보이지 않았으나, 뿌리신장의 경우 남아 있는 뿌리길이가 적을수록 신장율이 높았으며 7일묘에 비해 14일묘에서 초장 및 뿌리 신장율이 높은 경향이었다.
2. 생육온도에 따른 초장 신장은 25°C 및 28°C에서 신장율이 높았으나 18°C에서는 낮은 경향이었으며, 뿌리 신장은 7일묘는 22~28°C, 14일묘의 경우 22~25°C에서 높았다.
3. 7일묘는 뿌리생육량과 초장변화와의 상관관계가 높았으나 14일묘의 경우 유의적인 상관관계를 보이지 않았다.
4. 질소 흡수량은 생육온도 25, 28, 22, 18°C순으로 낮아졌으며 7일묘의 경우 14일묘에 비해 생육온도에 따른 질소 흡수량 차이가 적은 경향이었다.
5. 단근처리에 따른 뿌리량별 질소 흡수량은 큰 차이를 보이지 않았으며 7일묘가 14일묘에 비해 질소흡수가 빨리시작되는 경향이었다.
6. 뿌리활력은 7일묘의 경우 뿌리가 3 cm 남기고 단근 시가장 높았으며, 14일묘의 경우 1.5 cm 남기고 단근 시활력이 높은 경향이었다.

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