Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
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Effects of Water Microspraying, Foliar Application of Calcium Carbonate and Kaolin Solution on Sunburn and Quality of Fruits in Satusma Mandarin

미세살수와 탄산칼슘 및 카올린 엽면살포가 온주밀감의 일소 발생과 과실 품질에 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) ;
  • Park, Yo-Sup (Citrus Research Institute, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Kim, Mi-Sun (Citrus Research Institute, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Kim, Ha-Neul (Citrus Research Institute, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Oh, Bok-Shim (Citrus Research Institute, National Institute of Horticultural & Herbal Science, Rural Development Administration)
  • 좌재호 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 강석범 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 박요섭 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 김미선 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 김하늘 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 오복심 (농촌진흥청 국립원예특작과학원 감귤연구소)
  • Received : 2022.07.01
  • Accepted : 2022.08.16
  • Published : 2022.10.31
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Abstract

This study was carried out to predict fruit surface temperature (FST) causing sunburn symptoms and assess the correlation between solar radiation and FST in satusma mandarin (Citrus unshiu Marc. 'Iwasaki'). And to reduce sunburn when ambient temperature was at 31℃, sprinkler system was repeated spraying every at 5 minutes of 30 minutes intervals and 1% calcium carbonate and 4% kaolin solution applied on citrus tree three times to investigate quality and sunburn of fruits. It showed highly significant positive correlation between FST and solar radiation (R = 0.788, p < 0.01), The FST increased up to 16℃ than ambient temperature at daytime. To estimate FST, a linear model y = 0.099 × (air temperature) + 0.018 × (solar radiation) + 20.779 (R = 0.687, p < 0.01) was derived. The canopy temperature of citrus trees was 5.1℃ lower in sprinkler system than in control. The incidence of sunburn showed at 2.1% in sprinkler system twice lower than in control and there was different significance. Fruit quality was similar between treatments. In conclusion, sunburn can be reduced by reflecting sunlight or downing of FST through sprinkler system.

본 연구는 '암기조생' 감귤 과실의 표면온도와 일사량 간의 상관관계를 분석하여 일소가 유발되는 과실 표면온도를 예측하고 일소 발생을 경감시키고자 수행하였다. 이를 위해 기온이 31℃일 때 30분 간격으로 5분 미세살수와 1% 탄산칼슘, 4% 카올린 용액을 10일 간격으로 3회 엽면살포하여 일소과 발생과 과실 품질을 조사하였다. 과실 표면온도는 일사량과 R = 0.788(p < 0.01)로 유의한 정의 상관관계를 나타냈으며 한낮에는 기온보다 최고 16℃가 높았다. 과실 표면온도를 추정하는 회귀식 y = 0.099 × (대기온도) + 0.018 × (일사량) + 20.779(R = 0.687, p < 0.01)을도출하였다. 30분 간격으로 5분 미세살수시수관 내부 온도가 무처리보다 5.1℃ 낮았다. 일소과 발생률은 미세살수구가 2.1%로 무처리구보다 2배 이상 낮았고 통계적으로 유의성을 나타냈으나, 과실 품질은 처리간에 비슷하였다. 햇빛을 반사하거나 미세살수를 실시하여 과실 표면온도를 낮추면 일소 발생을 줄일 수 있을 것으로 보인다.

Keywords

Acknowledgement

본 연구는 농촌진흥청 연구비 지원으로 수행되었음(과제번호: PJ01414601).

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