Effect of different Leaf to Fruit Ratios on Tree Growth and Fruit Characteristics of ‘Irwin’ Mango in heating house
2024
Cheon, M.G. | Park, K.M. | Choi, S.W. | Yoon, H.S.
This study investigated the effect of leaf-to-fruit (L/F) ratio on the growth and fruit characteristics of four-year-old ‘Irwin’ mango trees, cultivated as an early heating type in Daesan-myeon, Haman-gun, Gyeongsangnam-do, during the 2021-2023 seasons. Treatments included 30 (high fruit load), 45, 60, and 75 (low fruit load) leaves per fruit. The study found that the number of shoots and panicles for the following year, which emerged after pruning, increased with higher L/F, peaking at L/F 60. At L/F ratio 75, with the smallest fruits, there was a decrease compared to L/F 60. Conversely, L/F 30, characterized by high fruit loads, resulted in alternate bearing with excessive fruits in the second year due to a decline in panicle numbers, although panicle emergence recovered in the third year as fruit numbers decreased. The harvest period shortened with larger L/F and lower fruit loads, being shortest at L/F 60, with no significant difference from L/F 75. Regarding fruit characteristics, average weight increased with L/F, but fruit quality measures such as soluble solid content (SSC) and acidity showed no significant differences between treatments. The annual yield increase per tree and the number of fruits exceeding 400g preferred by consumers were highest at L/F 60. L/F 30 inhibited flowering in the second year, leading to decreased fruit quantity. Consequently, this study suggests an optimal L/F of 60:1, based on the 45th day post-blooming, for ‘Irwin’ mango cultivation in domestic heated plastic film houses, promoting stable flowering and yield in the subsequent year.
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