Effects of Fruit Thinning on the Fruit Growth and the Variation of Acid Content in the Fruit Juice of Mature Kawano-Natsudaidai Trees

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  • 川野ナツダイダイ成木の果実の肥大と果汁の酸含量の変動に及ぼす摘果の影響
  • カワ ヤ ナツダイダイ セイボク ノ カジツ ノ ヒダイ ト カジュウ ノ サ

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Effects of fruit thinning on the fruit growth and the variation of acid content in the juice of twenty-year-old Kawano-Natsudaidai trees were examined. The numbers of leaves per fruit in the thinned trees were 83 and 92, and 62 and 69 in the non-thinned trees. Fruit size and acid content in the juice were measured on both February 3 and April 26.<br>1) Fruit growth was superior in the thinned trees, and number of L, M size fruits was greater. The ratios of smaller fruits below S size were 47.2 and 49.1% in the non-thinned trees, and 2.1 and 23.3% in the thinned trees. The range of mean fruit weight in each bearing part (top, middle and bottom height of the tree and inner and outer part of the tree crown) measured in February was from 328 to 376g in the thinned trees, whereas it was from 257 to 381g in the non-thinned tree.<br>2) The variation of acid content in the juice examined in February ranged from 1.4 to 2.3% in the thinned tree, while it ranged from 1.5 to 2.9% in the non-thinned tree. Average acid contents of thinned and non-thinned tree were 1.78 and 2.19%, and the variation coefficients were 9.6 and 13.7%, respectively. The average acid content in each bearing part ranged from 1.74 to 2.01% in the thinned tree, and from 1.81 to 2.48% in the non-thinned tree. When the fruits were stored in room temperature after harvest in february and examined in April, the variation of acid content ranged from 0.9 to 2.0% in the thinned tree, and from 1.1 to 2.5% in the non-thinned tree. Their average acid contents were 1.45 and 1.68%, respectively. the acid content was lowered as a whole with storage, but its variation was not affected.<br>3) Significant negative correlations were found between acid content, fruit weight and the number of leaves per bearing shoot both in February and April observation. Correlation coefficients between acid content and fruit weight were r=-0.19 and -0.33 in the thinned trees, and r=-0.71 and -0.72 in the non-thinned trees. While those between acid content and the number of leaves per bearing shoot were r=-0.49 and -0.28 in the thinned trees, r=-0.37 and -0.17 in the non-thinned trees respectively.

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