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Influence of Air Temperature during Midsummer on Fruit Sunburn Occurrence in 'Fuji'/M.9 Apple Tree

한여름 기온이 '후지'/M.9 사과나무의 과실 일소증상 발생에 미치는 영향

  • Song, Yang-Yik (Apple Experiment Station, National Institute of Horticulture & Herbal Science, Rural Development Administration) ;
  • Park, Moo-Yong (Apple Experiment Station, National Institute of Horticulture & Herbal Science, Rural Development Administration) ;
  • Yang, Sang-Jin (Horticulture & Herbal Crop Division, Extension Service Bureau, Rural Development Administration) ;
  • SaGong, Dong-Hoon (Apple Experiment Station, National Institute of Horticulture & Herbal Science, Rural Development Administration)
  • 송양익 (국립원예특작과학원 사과시험장) ;
  • 박무용 (국립원예특작과학원 사과시험장) ;
  • 양상진 (농촌진흥청 농촌지원국 원예특작과) ;
  • 사공동훈 (국립원예특작과학원 사과시험장)
  • Published : 2009.12.30

Abstract

This study was carried out to investigate the effects of air temperature during midsummer on sunburn occurrence that had some problems recently on 'Fuji'/M.9 planting system in Korea. There was a positive relationship between sunburn incidence and accumulated days with high air temperature over $31^{\circ}C$, or accumulated total quantum per day. 'Fuji'/M.9 apple trees with relatively open canopies, compared to 'Fuji'/M.26, were more susceptible to sunburn injury because the fruit was more exposed to sunlight. In 'Fuji'/M.9 apple trees, those that were poor in vigor or with short bourse shoot length were more susceptible to sunburn injury. Sunburn incidence was affected by neither regions nor row orientations. Sunburn was observed most often on the fruits on the south and west sides of the trees. The reason was due to high skin temperature of the fruits reaching $40{\sim}45^{\circ}C$ under full sunlight.

본 실험은 '후지'/M.9 재배체계에 있어 최근 문제시되는 일소증상 발생에 미치는 한여름의 기온 요인을 구명하기 위하여 실시되었다. 일소증상은 최고기온이 $31^{\circ}C$이상인 누적일수 및 하루 누적 총광량이 많을수록 발생이 증가하였다. 상대적으로 개방된 수관을 형성한 '후지'/M.9은 '후지'/M.26보다 과실이 광에 노출되기 쉬워 일소증상 피해가 더 컸다. '후지'/M.9 사과나무 중에서는 과대지 길이가 짧은 나무에서 일소증상 피해가 더 컸다. 일소증상 발생은 재배지역 및 재식 열방향에 영향을 받지 않았고, 주로 남쪽과 서쪽에 착과 된 과실에서 일소증상 발생이 많았다. 그 이유는 과실이 직사광선에 노출되어 과실온도가 $40{\sim}45^{\circ}C$를 넘었기 때문으로 판단되었다.

Keywords

References

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