수도 분얼 기간의 기온의 고저 및 교차가 수도 생육에 미치는 영향을 알고저 분얼기를 활착후 10일간씩 초기, 중기, 후기로 나누어 주간 온도를 25℃ , 30℃ , 야간 온도를 10,15,20,25℃ 로 7조합을 하여 작물시험장 인공 기상실에서 시험한 결과를 요약하면 다음과 같다. 1. 최고 분얼수는 조기, 중기 처리에서 많고 후기 처리에서 영향이 적었다. 2. 온도 처리 완료후의 초장 경수의 적은 조, 중기에서 주간 30℃ , 야간25℃ 에서 컸으며 후기 처리는 차이가 적었다. 3. R.G.R(g/g/day)는 조기 처리에서 높았다. 4. 성숙기 엽중은 조기 처리에서 가장 많고 후기 처리에서 적었다. 5. 따라서 수도 생육에 미치는 온도의 영향은 분얼 초기에 크다고 하겠다.

In order to ascertain the effects of fluctuations and range of daily temperatures on the growth of rice, a pot(1/5, 000 are) experiment was conducted in the phytotron, Crop Experiment Station, in 1972. Seven treatment combinations of day-temperatures 25 and 30˚ with night-temperatures 10, 15, 20 and 25˚ were applied in three 10 days periods, in to which the tillering stage was split after rooting of the paddy, namely, early, middle and late. The results may be summarized as follows: 1. The number of tillers were maximum with the treatments of day-temperature 30˚ and night-temperatures 20 as well as 25˚ in the early and middle periods, while the effects were small in the late period. 2. Multiplying plant height and number of panicles resulted in a high figure by combining a day-temperature of 30˚ with night-temperatures 20 as well as 25˚ in the early and middle periods, and no differences in the late period. 3. The treatment in the early period yielded a high RGR(g/g/day), of which the treatment combinations of day-temperature 30˚ with night-temperatures 20 and 25˚ gave the highest figure. 4. High straw weight in ripening stage was obtained with the temperature treatments in the early period rather than those in the late period. 5. Accordingly, it seems that the effect of temperature on the emergence of tillers is the highest at the early stage of tillering.

• 朴錫洪(농촌진흥청) | 박석홍
• 李殷雄(서울대학교농과대학) | 이은웅