Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Comparison of Fruit Development and Quality Indices According to Blossom Thinning on Early-season 'Hanareum' and Mid-season 'Niitaka' Pears

조생종 '한아름' 및 중생종 '신고' 배의 적화처리에 따른 과실 비대 및 품질 비교

  • Lee, Ug-Yong (Pear Research Institute, National Institute of Horticultural and Herbal Science) ;
  • Kim, Yoon-Kyoung (Pear Research Institute, National Institute of Horticultural and Herbal Science) ;
  • Shin, Il-Sheob (Pear Research Institute, National Institute of Horticultural and Herbal Science) ;
  • Oh, Kwang-Suk (Department of Horticulture, Chungnam National University) ;
  • Jung, Ok-Kun (Cheonan-Si Agricultural Technology Center) ;
  • Chun, Jong-Pil (Department of Horticulture, Chungnam National University)
  • Received : 2015.03.03
  • Accepted : 2015.04.01
  • Published : 2015.08.31
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Abstract

In this study, we evaluated the differences in fruit development and quality indices of fruits subjected to blossom thinning before full bloom in 'Hanareum' and 'Niitaka' pears (Pyrus pyrifolia Nakai). We carried out a thinning treatments at 5 days before full bloom, targeting the blossoms at the 1st and 2nd position (T1) or the blossoms at the 6th and 7th position (T2) from the basal part of the flower cluster in both cultivars. Blossom thinning treatments increased the average fruit weight of early-season Asian pear 'Hanareum' up to 10.5% (T1) and 11.0% (T2) at harvest time (110 days after full bloom). The mid-season 'Niitaka' pear showed increased fruit weight of up to 12.6% (T1) and 16.8% (T2) at harvest time (170 days after full bloom). Moreover, these treatments increased the production rate of bigger sized fruits in both cultivars. Removal of blooms also affected fruit quality indices; the bloom-thinned fruits showed higher soluble solids contents (about $1^{\circ}Brix$) and higher skin color redness ($a^*$) especially in 'Niitaka' pears when compared to the non-thinned controls. Overall, the treatments increased the fruit size and weight as well as fruit quality including soluble solids and skin color. Bloom thinning treatment targeting the 6th to 7th blossom from the basal part of the flower cluster may be recommended as the practical thinning method in Asian pear 'Hanareum' and 'Niitaka'.

본 연구에서는 조생종 '한아름'과 중생종 '신고'에서 만개전 적화처리가 과실의 비대 및 품질에 미치는 영향을 조사하기 위하여 만개 전 5일에 적화처리를 실시하였다. 처리내용은 무처리구, 기부로부터 1, 2번화 제거구(T1), 6, 7번화 제거구(T2)로 나누어 실시하였다. 조생종 '한아름'의 경우 최종수확기에는 3.6%(T1) 및 4.6%(T2)의 크기 증가를 보였고 수확기 과실무게도 10.5%(T1) 및 11.0%(T2)의 증가를 보였다. 중생종 '신고'에서는 최종 수확기에는 12.6%(T1) 및 16.8%(T2)의 과실무게 증가를 보였고 두 품종 모두 대과의 생산비율이 증가하는 경향을 보였다. 적화처리구는 수확기 가용성고형물 함량이 $1^{\circ}Brix$ 정도 증가하였으며 '신고'의 경우에도 무처리구에 비해 적화처리구의 과실에서 높은 적색도를 보였다. 따라서 조생종 '한아름'과 중생종 '신고' 배에 대한 만개 전 적화 처리는 과실의 비대촉진 및 가용성 고형물 증가 및 과피색 향상에 효과를 보이는 것으로 조사되었으며 화총의 기부로부터 6, 7번째 착색된 꽃을 제거하는 것이 보다 실용적인 방법으로 추천되었다.

Keywords

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