고온과 다습조건이 양파의 생리반응에 미치는 영향 = Effects of High-Temperature and Soil Moisture Conditions on the Physiological Response of Onion

다국어 초록 (Multilingual Abstract)

The objectives of this study were to determine the effects of a combination of high-temperature and excessive irrigation treatments on growth, physiological response, and yield of onion (Allium cepa). These experiments were conducted in a typical plastic house (one side open and the other side installed ventilation fans) with a gradient air temperature (maximum different value of air temperature: 6°C). The excessive irrigation (EI) treatment commenced at 149 days after transplanting. Significant differences were found in the growth parameters in response to air temperature and soil moisture conditions. Under a combination of ambient (A) + 6°C and A + 3°C with optimal irrigation (OI) conditions, the plant height was 128.7 and 128.9 cm/plant, respectively, which was the highest among all the tested treatments. The number of leaves showed the greatest difference of 11.8 and 11.7/plant at A + 3°C andA + 6°C with OI and least difference of 8.6/plant in A-EI. The stem diameter and leaf width were higher under A + 3°C and A + 6°C with OI conditions than in the ambient temperature treatment. Bulb weight dramatically increased under the A + 6°C and A + 3°C temperature treatments. The marketable yields increased by 157% and 127% under A + 6°C-OI and A + 6°C-EI temperature treatments than in ambient temperature with OI. These results indicated that onion yields increased in response to 6°C or 3°C high-temperature treatments than under the ambient temperature treatment.

국문 초록 (Abstract)

양파의 고온과 다습조건이 생육, 생리반응 및 수량에 미치는 영향을 구명하고자 본 실험을 수행하였다. 본 실험은 하우스의막혀 있는 부분에 설치된 환기팬을 이용하여 시설 내부로 공기를 빨아들여 개방된 반대쪽 입구로 배출함으로써 입구와 안쪽의온도차가 6°C로 조절되는 시설에서 수행하였다. 토양수분 다습처리(EI)는 정식후 149일부터 토양수분 함량이 40%가 되도록처리하였다. 양파의 생육특성은 온도와 토양수분에 의해 유의성이 있었다. 초장은 외기 + 3°C(Ambient; A + 3°C), 외기 +6°C(A + 6°C)의 적습(OI) 처리구가 각각 128.7cm와 128.9cm로 다른 처리구보다 컸다. 엽수는 A + 3°C-OI 처리와 A + 6°C-OI처리구가 주당 11.8매와 11.7매로 가장 많았고, A-EI 처리구가 8.6매로 가장 적었다. 양파의 경경과 엽폭은 A + 3°C-OI 처리와A + 6°C-OI 처리구가 외기처리구보다 증가하였다. 양파의 구중은 A + 3°C, A + 6°C 처리구에서 증가하였다. 상품수량은 A+ 6°C-OI처리와 A + 3°C-OI 처리구가 외기-OI 대비 각각 157%, 127% 가 증가하였다. 따라서 양파는 외기보다 6°C 정도 고온이 되면 수량이 증가하는 것으로 나타났다. 생육 후기 과다한 토양 수분에 따라 생장이 억제되었다. 그리고 수량과 과실의 형태는 토양수분보다는 기온의 영향이 컸다. 외기온 처리구(대조구)에서 토양 수분이 과다한 처리구에서 수량이 감소하였으나, 고온 처리구(+ 3°C)에서는 과다한 토양 수분이 구중의 무게가 유의하게 컸다.

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