Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
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Influence of Time of Hand-thining on Bitter Pit Incidence and Fruit Quality in 'Gamhong'/M.9 Apple Trees

인력 적과 시기가 '감홍'/M.9 사과나무의 고두증상 발생과 과실품질에 미치는 영향

  • Kweon, Hun-Joong (Apple Research Institute, National Institute of Horticultural and Herbal Science, Rural Development Administration) ;
  • Sagong, Dong-Hoon (Division of Life and Environmental Science (Horticulture), College of Natural and Life Sciences, Daegu University)
  • 권헌중 (농촌진흥청 국립원예특작과학원 사과연구소) ;
  • 사공동훈 (대구대학교 과학생명융합대학 생명환경학부 원예학전공)
  • Received : 2021.07.05
  • Accepted : 2021.10.13
  • Published : 2021.10.31
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Abstract

This study was conducted to investigate the effect of time of hand-thinning on vegetative growth, bitter pit incidence, fruit quality, and return bloom in 'Gamhong'/M.9 apple trees. The time of hand-thinning were 3, 5, 7 and 9 weeks after full bloom, and the primary thinning (leaving only the king fruit on cluster) and secondary thinning (adjusting crop load) were conducted at the same time. The time of hand-thinning was correlated to the vegetative growth, average fruit wight, yield, soluble solids content, bitter pit incidence, and return bloom, negatively, and to the yield of middle grade fruits (fruit weight was 250-299g and none pit on fruit surface) per tree, calcium contents of leaves, and fruit red color, positively. There was no significant effect of time of hand-thinning on fruit firmness, titratable acidity, and total incomes per tree. In conclusion, if the time of hand-thinning of 'Gamhong'/M.9 apple tree was completed at 9 weeks after full bloom, it could produce about 300g of high-quality fruit without bitter pit.

본 시험은 '감홍'/M.9 사과나무의 인력 적과 시기가 영양생장, 고두증상, 과실품질 및 이듬해 개화율에 미치는 영향을 조사하고자 실시하였다. 인력 적과 시기는 만개 후 3, 5, 7, 9주였으며, 1차 적과(중심과만 남기는 적과)와 2차 적과(착과수 조절을 위한 적과)는 동시에 이루어졌다. 인력 적과 시기는 영양 생장, 평균 과중, 생산량, 가용성 고형물 함량, 고두증상 발생률 및 이듬해 개화율과 역의 상관관계를 가졌으나 나무별 중급 과실(과중이 214-299g이면서 고두증상이 발생하지 않은 과실)의 생산량, 잎 내 칼슘 함량 및 과실의 착색 정도와는 정의 상관관계를 가졌다. 과실의 경도, 산 함량 및 나무 당 총 조수입은 인력 적과 시기에 영향을 받지 않았다. 결론적으로, '감홍'/M.9 사과나무의 인력 적과가 만개 후 9주에 마무리되면 고두증상이 없는 300g 정도의 고품질 과실을 생산할 수 있었다.

Keywords

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