Korean Journal of Agricultural Science (농업과학연구)

Institute of Agricultural Science, CNU (충남대학교 농업과학연구소)
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Effect of crop load on the yield, fruit quality, and fruit mineral contents of 'RubyS' apples

  • Nay Myo, Win (Apple Research Institute, National Institute of Horticultural and Herbal Science, RDA) ;
  • Dongyong, Lee (Apple Research Institute, National Institute of Horticultural and Herbal Science, RDA) ;
  • Yang-Yik, Song (Apple Research Institute, National Institute of Horticultural and Herbal Science, RDA) ;
  • Juhyeon, Park (Apple Research Institute, National Institute of Horticultural and Herbal Science, RDA) ;
  • Young Sik, Cho (Apple Research Institute, National Institute of Horticultural and Herbal Science, RDA) ;
  • Moo-Yong, Park (Apple Research Institute, National Institute of Horticultural and Herbal Science, RDA) ;
  • Youngsuk, Lee (Apple Research Institute, National Institute of Horticultural and Herbal Science, RDA) ;
  • Hun Joong, Kweon (Apple Research Institute, National Institute of Horticultural and Herbal Science, RDA) ;
  • Jingi, Yoo (Tree Fruit Research and Extension Center, Washington State University) ;
  • In-Kyu, Kang (Department of Horticultural Science, Kyungpook National University) ;
  • Jong-Chul, Nam (Apple Research Institute, National Institute of Horticultural and Herbal Science, RDA)
  • Received : 2022.03.07
  • Accepted : 2022.06.17
  • Published : 2022.09.01
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Abstract

Crop load management in apple trees is important for achieving optimum productivity and crop value. Hence, we investigated the influence of different crop loads on the fruit quality, mineral content, and yield of the 'RubyS' apple variety. After 4 weeks of full bloom, the crop load was adjusted by hand thinning to different (5, 10, and 15 fruits·cm-2) trunk cross-sectional areas (TCSA), representing low, medium, and high crop loads. The low crop load increased the fruit size and weight, the development of the red-blushed area, and the peel color a* at harvest; however, it reduced the total number of fruits·tree-1 and yield compared with that of the other crop loads. The medium crop load improved the fruit weight, flesh firmness, and soluble solids content and reduced the fruits·tree-1 but did not affect the fruit size and yield. However, there were no significant differences in the titratable acidity and starch index among the crop loads. The fruit mineral content (phosphorus and potassium) was higher in the low and medium crop loads compared to the high crop load. However, the nitrogen, calcium, and magnesium contents in the fruits were not affected by the crop loads. Overall, this study suggests that a low crop load improves the fruit size and weight, but its effect on the quality and fruit mineral content is similar to that of a medium crop load. Therefore, the optimum crop load level for the 'RubyS' apple trees was approximately 10 fruits·cm-2 TCSA.

Keywords

Acknowledgement

This work was supported by the 2022 RDA fellowship program of the National Institute of Horticultural and Herbal Science, Rural Development Administration, Republic of Korea, and the 2017 research fund (PJ01270202) the Rural Development Administration, Republic of Korea.

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