Effects of Water Stress on Growth and Yield of Paeonia lactiflora Pallas

수분스트레스가 작약의 생육과 수량에 미치는 영향

The study was carried out to find effects on growth and yield by drought in Paeonia lactiflora Pallas. The water stress treatment was imposed artificially on April 1 to May 30(top part growth high stage), June 1 to July 30(root growth high stage), August 1 to September 29(late growth stage) and control(below 50kPa) in rain shelter. In drought periods of April 1 to May 30, stem length and number of stem were 67.5cm and 10.4 ea/plant. It showed poor growth compared with control, and root length and diameter also decreased to 27.2cm and 24.5mm, respectively. In root yield, drought treatment of June 1 to July 30 showed lower root yield as $1,809kg\;10a^{-1}$, $1,902kg\;10a^{-1}$ for drought period of August 1 to September 29, compared with $2,039kg\;10a^{-1}$ of control, resulting in 11% and 7% reduction, respectively. Optimum irrigation times (50kPa) was 17 days after continuos rain-off in Spring(April 1 to May 30), 9 days in summer(June 1 to July 30). It could be estimated that effective irrigation point was at least 13 days in after August(Aug. 1 to Sep. 29).

작약의 생육단계별 한발처리가 생육과 수량에 미치는 영향을 구명코자 수행한 시험 결과는 다음과 같다. 지상부 생육은 4월1일~5월30일 단수처리에서 경장67.5cm, 경수 10.4개로서 대조구보다 각각 6.8cm, 0.9개 작거나 적었다. 지하부 생육은 6월 1일~7월30일 단수처리에서 근장 27.2cm, 근경 24.5mm로서 대조구의 33.1cm, 29.8mm보다 각각 5.9cm, 5.3mm 작거나 가늘었고, 뿌리수략은 대조구가 $2,039kg\;10a^{-1}$인데 비해 6월 1일~7월 30일 단수처리구는 $1,809kg\;10a^{-1}$으로서 11% 감소되었으며 상품수량도 17% 감소하여 가장 피해가 컸다. 장기간 한발시 수분스트레스에 의한 생육장해를 방지하기 위한 적정관수(50kPa)시기는 봄에는 무강우후 17일경, 여름에는 무강우후 9일경, 생육후기인 8월부터는 무강우후 13일경으로 예측되었다.