Effects of Bloom Thinning with Lime Sulfur on Fruit Set, Yield, and Fruit Quality Attributes of ‘RubyS’ Apples

Abstract

Bloom thinning is an important practice that influences the profitability of the orchard. Hence, we assessed the effect of chemical bloom thinning on thinning efficiency and fruit quality of 'RubyS' apples. Lime sulfur was applied as a bloom thinning agent at 1, 1 + 3, and 2 + 4 days after full bloom (DAFB), and non-bloom thinning trees were used as controls. Compared to the control and bloom thinning treatments at 1 DAFB and 2 + 4 DAFB, the application of bloom thinning at 1 + 3 DAFB greatly decreased the number of fruits per cluster in both terminal and lateral flowers. Although the application of bloom thinning at 2 + 4 DAFB decreased the number of fruits per cluster in the terminal flower, it did not affect the number of fruits per cluster in the lateral flower when compared to the control. At harvest, the number of fruits per tree (fruits/ tree) and yield (kg/ tree) was significantly higher in control trees than in bloom-thinned trees. However, fruit quality attributes including fruit weight and size, flesh firmness, soluble solids content, area of red-blushed surface, and a* value in the fruit were significantly improved by bloom thinning at 1 + 3 DAFB. Therefore, this study suggested that applying bloom thinning at 1 + 3 DAFB could serve as an effective thinning treatment to manage crop load in trees and improve the quality of 'RubyS' apple fruits.

Effects of Mechanical Flower Thinning on the Fruit Set and Fruit Quality Attributes of ‘Hongro’ Apples

“…Chemical thinning was done by spraying a lime sulfur solution (120-fold dilution, 8.33 mL/L) (Be' 22, Hwangbuja, Enbio Co., Jecheon, Korea) at 20 % (April 23, 2021) and 100 % (April 25, 2021) of full bloom. The lime sulfur solution (120-fold dilution in water) was prepared according to Win et al (2022a) and sprayed using a hand sprayer. Mechanical thinning was done at 20 % full bloom (April 23, 2021).…”

“…Larger fruits tend to have more cells per fruit, and early thinning could increase the fruit size, thereby increasing the cell number and size outcomes (Greybe et al, 1998;McClure and Cline, 2015). Additionally, an improved fruit size is also associated with the crop load level and cultivar (Serra et al, 2016;Csihon et al, 2022;Shi et al, 2022;Win et al, 2022aWin et al, , 2022b. However, the increases in fruit weight and size by mechanical thinning vary depending on the specific apple cultivar and on the rotor speed used, as reported in previous studies (Solomakhin and Blanke, 2010).…”

Experimental Control of Day and Night Temperatures to Improve the Growth and External Quality of Salvia miltiorrhiza Bunge

“…(Heuvelink, 1989;Grimstad and Frimanslund, 1993;Gruda, 2005), 고온성 작물 중 하나인 파프리카(Capsicum annuum var. angulosum) 묘는 15°C의 저온수준에서 상대적으로 생체중, 건물중 등의 생장량이 현저히 낮아지는 것으로 조사되어 본 실험의 결과와 유 사하였으며 (Cho et al, 2016) (Kim et al, 2022a), 과거 다양한 연구에서 식 물의 외적품질을 평가하는데 활용되었다 (Belal et al, 2022;Win et al, 2022;Habibi et al, 2023;Park et al, 2023;Wang et al, 2023). CIELAB 색공간 좌표에서 명도를 나타내는 L * 은 32/27°C 처리구에서 58.20으로 가장 높은 것으로 나타났다 (Fig.…”

Effect of Fatty Alcohol and 6-Benzyladenine on Fruit Set and Fruit Quality of ‘Fuji’ Apples

“…적화제로는 석회유황합제(lime sulfur)가 적용되고 있으나 (Guak et al, 2002;Chun et al, 2012) 사용 방법 및 개화 정도에 따라 효과가 차이를 보이며 (Yoo et al, 2016;Kamiab et al, 2020;Win et al, 2022), 또한 처리농도와 처리 횟수가 증가하면 과실의 동녹과 엽소장해가 발생하는 경우도 있다고 보고되었다 (Jang et al, 1998;Dennis, 2000). 또한 국내에서는 fatty alcohol의 종류 중 하나인 octyl alcohol이 적화제로서 효과가 있다고 보고되었다 (Yoo et al, 2019).…”