Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
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Effect of Canopy Covering on Thermal Insulation and Freezing Tolerence of 'Shiranui' Hybrid Mandarin Cultivated in Field During Winter Season

수관 피복이 노지재배 '부지화' 감귤나무의 보온과 내한성에 미치는 영향

  • Joa, Jae-Ho (Citrus Research Institute, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Kang, Seok-Beom (Citrus Research Institute, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Moon, Young-Eel (Citrus Research Institute, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Lee, Hae-Jin (Department of Digital Agriculture, Rural Development Administration)
  • 좌재호 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 강석범 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 문영일 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 이혜진 (농촌진흥청 디지털농업추진단)
  • Received : 2021.07.12
  • Accepted : 2021.10.28
  • Published : 2021.10.31
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Abstract

It were investigated changes in internal and external temperature, relative humidity using tyvek, weedstop, and 35% shading net as covering material to reduce the freezing damage of 'Shiranui' hybrid mandarin grown in open field. It were also evaluated canopy covering effect and LT50 of leaves by covering material when it was cold at -2℃. In tyvek, temperature difference between inside and outside was low at the height of 1.5m and was high at 0.4m. The relative humidity differed greatly between day and night, and was high at 6-8 a.m. At -2℃, Sum of temperature at the height of 1.5m of canopy for 24-hour after covering were at 3.4℃ higher in tyvek than in control. The LT50 of leaves was at 1.51℃ in tyvek, 1.33℃ in withstop, and 1.61℃ in 35% shading net lower than in control. Considering thermal insulation and relative humidity in canopy, tyvek is expected to reduce low temperature damage when covering after making a fine hole for ventilation.

노지재배 '부지화' 나무의 동해를 경감시키기 위해 피복재로 타이벡, 위드스톱, 35% 차광망을 사용하여 피복재 내, 외부 온도와 상대습도 변화를 평가하였다. 한파 시 피복에 따른 보온 정도와 잎의 LT50을 조사하였다. 타이벡은 1.5m에서 피복재 내부와 외부의 온도 차이는 낮았고 0.4m에서는 높았다. 상대습도는 주야간 차이가 컸으며 오전 6-8시에 높았다.-2℃일 때 24시간 타이벡 피복은 수관 1.5m에서 무처리보다 적산온도가 3.4℃ 높았다. 잎의 LT50은 타이벡 1.51℃, 위드스톱 1.33℃, 35% 차광망은 1.61℃로 무처리보다 낮았다. 타이벡의 수관 내 보온효과와 상대습도를 고려할 때 환기를 위한 미세한 천공 후 '부지화' 나무에 피복시 동해 발생을 줄일 수 있을 것으로 보인다.

Keywords

Acknowledgement

본 연구는 농촌진흥청 연구비 지원으로 수행되었음(과제번호: PJ01358102).

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