Horticulture, Environment, and Biotechnology : HEB

Korean Society of Horticultural Science (한국원예학회)
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Effect of Air Temperature on Tipburn Incidence of Butterhead and Leaf Lettuce in a Plant Factory

식물 공장에서 반결구 상추와 잎상추의 잎끝마름 발생에 미치는 온도의 영향

Choi, Ki-Young;Lee, Yong-Beom
최기영;이용범

  • Published : 20030000
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Abstract

In a plant factory with completely controlled environments, incidence of tipburn in the middle growth stage (25 days after treatment) was observed only in butterhead lettuce at 30/25oC (day/night) when head development was in progress. At 20/15oC in later stage, tipburn was observed 100% in butterhead lettuce and 50% in leaf lettuce. Growth of both lettuces was affected by air temperature, which increased photosynthesis and ion leakage. Highest photosynthesis and growth were observed at 30/25oC until the middle stage. In later stage, on the other hand, photosynthesis was highest at 20/15oC in both lettuces, while growth of leaf lettuce was fastest at 30/25oC, and butterhead lettuce did not show any difference between 30/25oC and 20/15oC. Ion leakage in both lettuces was 2.22.6 times higher at 30/25oC than that at 10/7oC. Butterhead lettuce was more sensitive to tipburn compared to leaf lettuce. Mass production of quality lettuce in the plant factory could be achieved through optimal temperature management, since growth rate was closely related to tipburn incidence. In this experiment, optimum day temperature for butterhead and leaf lettuces was 22 to 26oC in the initial and middle growth stages and 20 to 24oC in the later growth stage. Optimum night temperature was 15 to 20oC.

완전 제어형 식물 공장에서, 잎끝마름 발생은 생육 중기30/25oC(주/야) 처리에서 결구가 형성될 때 반결구 상추에서만 관찰되었으며, 생육 후기에는 20/15oC 처리에서 반결구 상추는 100%, 잎상추는 50% 발생하였다. 반결구 상추와 잎상추의 생육은 온도의 영향을 받아 광합성과 이온 유출을 증가시켰으며, 생육 중기 30/25oC 처리에서 광합성과 생육이 가장 높았다. 한편 생육 후기 두 종 상추의 광합성은 20/15oC 처리에서 가장 높았으나 잎상추의 생육은 30/25oC 처리에서, 반결구 상추는 20/15oC와 30/25oC 처리간 차이가 없었다. 30/25oC에서 두 상추의 이온 유출은 10/7oC에 비해 2.2-2.6배 높았다. 반결구 상추는 잎상추에 비해 잎끝마름 발생에 더 민감하였다. 잎끝마름 발생이 생장 속도에 영향을 받음에 따라 식물 공장에서 고품질 상추의 대량 생산을 위한 적정 온도 관리가 필요하며, 반결구와 잎상추의 주간 온도로 생육 초기와 중기에는 22-26oC, 생육 후기는 20-24oC, 야간 온도는 15-20oC가 적합한 것으로 판단된다.

Keywords

References

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