Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Effect of Regulation of Leaf to Fruit Ratio on the Fruit Growth and Quality of 'Haryejosaeng' Satsuma Mandarin in Non-Heated Plastic Film House

엽과비 조절이 무가온 하우스 하례조생 감귤의 비대 및 과실품질에 미치는 영향

  • Kang, Seok-Beom (Citrus Research Station, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Joha, Jae-Ho (Citrus Research Station, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Moon, Young-Eel (Citrus Research Station, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Lee, Hae-Jin (Citrus Research Station, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Han, Seung-Gap (Horticultural and Herbal Crop Environment Division, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Park, Kyung-Jin (Citrus Research Station, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Kim, Sang-Suk (Citrus Research Station, National Institute of Horticultural & Herbal Science, Rural Development Administration) ;
  • Choi, Young-Hun (Citrus Research Station, National Institute of Horticultural & Herbal Science, Rural Development Administration)
  • 강석범 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 좌재호 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 문영일 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 이혜진 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 한승갑 (농촌진흥청 국립원예특작과학원 원예특작환경과) ;
  • 박경진 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 김상숙 (농촌진흥청 국립원예특작과학원 감귤연구소) ;
  • 최영훈 (농촌진흥청 국립원예특작과학원 감귤연구소)
  • Received : 2018.07.23
  • Accepted : 2018.09.19
  • Published : 2018.09.30
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Abstract

BACKGROUND: Recently, the need for a method to cultivate 'Haryejosaeng' Satsuma mandarin has been increasing. However, there is limited information available as this is a new Satsuma mandarin cultivar, which was bred by the RDA in 2004. Many farmers who cultivate this cultivar follow the cultivation method similar to that used for 'Miyagawa' Satsuma mandarin, and suffer low production of optimum-sized fruits. METHODS AND RESULTS: This study was conducted to find out the optimum ratio of leaf-to-fruit for the stable production of high quality 'Haryejosaeng' Satsuma mandarin fruits in a non-heated plastic film house. Seven-year-old 'Haryejosaeng' Satsuma mandarin trees were used in the study. Before the treatment, the leaf-to-fruit ratio ranged from 5.7 to 17.9. The treatments included 10, 20, 30, and 40 leaves per fruit. The fruits were removed if over fruiting was observed at day 60 after full bloom. We investigated the fruit size and quality on the day of harvest. Flowering and fruiting patterns in each treatment were recorded for the following year. In the experiments, the flower-to-leaf ratio was 1.12 to 1.74. As the leaf-to-fruit ratio decreased, the fruit size and weight also decreased. Contrarily, the higher the ratio of leaf-to-fruit, the higher fruit size and weight were. It was noted that the ratio of 20:1 was ideal to produce the M grade optimum-sized Satsuma mandarin fruits on the day of harvest. However, higher ratio might result in fruits weighting above 100 g. There was no difference among the treatments in terms of fruit quality, such as total soluble solid contents, titratable acid, and color. In the subsequent years, flowering and fruiting in the treatments were lowered when the leaf number per fruit was 10, but they were improved when the leaf number per fruit was above 20. CONCLUSION: Based on the above results, the optimum ratio of leaf-to-fruit was found to be 20:1 for flowering and fruiting of 'Haryejosaeng' Satsuma mandarin. It is important that optimum ratio of leaf-to-fruit is set as a standard to produce good grade and quality of 'Haryejosaeng' Satsuma mandarin fruits.

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References

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