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Climate-related Changes in Fruit Growth of 'Fuyu' Persimmon during the Harvest Season

수확기 동안의 기상 변화에 따른 '부유' 감의 과실 생장

Choi, Seong-Tae;Park, Doo-Sang;Son, Ji-Young;Park, Yeo-Ok;Hong, Kwang-Pyo;Cho, Kwang-Sik
최성태;박두상;손지영;박여옥;홍광표;조광식

  • Received : 2012.03.25
  • Accepted : 2012.11.15
  • Published : 2013.02.28

Abstract

Relationships among climate changes, early frost, and fruit growth were studied during the final month to harvest of late-maturing 'Fuyu' persimmon (Diospyros kaki) to assess the changes in fruit characteristics during this critical period. The heavy frost on Nov. 16 defoliated more than 70% of the leaves, but with little damage on the fruits. However, all the leaves were defoliated by the heavy frost on Nov. 20, and all the fruits were cold-damaged by $-3.3^{\circ}C$ on Nov. 21. Fruit weight increased by 8-25 g per week from Oct. 25 (142 days after full bloom) to Nov. 15, reaching to 250 g, but it decreased by 3-4 g per week after the frost. Hunter a value of fruit skin gradually increased until the last harvest on Nov. 29 with a temporary halt in early Nov. when temperature was high, whereas fruit firmness rapidly decreased after the frost on Nov. 21. Fruit soluble solids were $15.7-16.1^{\circ}Brix$ for the final month. When some branches were covered with non-woven fabrics to avoid direct contact with frost, the fruits on the branches were not visually damaged by the low temperature although 40-60% of their leaves were defoliated on Nov. 16. However, low temperature on Nov. 20 and 21 defoliated all the leaves, causing cold damage on the fruits. There was a highly significant correlation between the fruit diameter and its weight ($R^2$ = 0.73-0.91). So, the regression equations could be used to estimate weight from diameter of the fruits sampled from the branches with the non-woven fabrics. The calculated fruit weight reached to a maximum of 240 g on Nov. 15. Daily increases in fruit weight were 1.1-2.5 g from Oct. 25 to 31, 1.9-3.5 g from Oct. 31 to Nov. 7, and 1.4-1.6 g from Nov. 7 to 12. However, fruit weight decreased by 0.3-1 g per day after the cold damage on Nov. 21. The results indicate that the most appropriate harvest time could be dependent on relationship of fruit growth to climate.

Keywords

air temperature;cold damage;frost damage;fruit characteristic

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Cited by

  1. Effect of Weather Conditions on Fruit Characteristics and Yield of 'Sangjudungsi' Persimmon Cultivar in Sangju, Gyeongsangbuk-do vol.17, pp.4, 2015, https://doi.org/10.5532/KJAFM.2015.17.4.340

Acknowledgement

Supported by : 농촌진흥청