Effect of One Year or 2-Year-Successive Strapping of Lateral Branches on Fruit Development of Japanese Persimmon 'Hiratanenashi' and 'Otanenashi'

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  • 単年および2年連続の側枝結縛処理がカキ'平核無'および'大核無'の果実発育に及ぼす影響

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Effects of one- and two-year successive strapping on reproductive and vegetative growth of 'Hiratanenashi' and 'Otanenashi' Japanese persimmons (Diospyros kaki Thunb.) were studied. Three- or four-year-old lateral branches of both the cultivars were strapped with wires at two weeks before full bloom. In the current year of the treatments, fruit growth and fruit set of the strapped branches were superior to those of the control. At harvest, soluble solid content (SSC) of both the cultivars in the two strapping treatments was significantly higher than that in the control. The two-year successive strapping increased fruit weight of 'Otanenashi' significantly and accelerated fruit maturity of 'Hiratanenashi' in the current year. During Stage I in 'Hiratanenashi', two-year successive strapping decreased the dry mass accumulation in the two-year-old branch and increased the percentage of dry mass distribution in the fruits, and the one-year strapping increased the dry mass accumulation in the shoots, leaves, fruits and total organs in the current year. It was suggested that the increased dry mass accumulation in the fruits in the two-year successive strapping, as well as one-year strapping improved fruit set, fruit growth and mature fruit quality. From the results, two-year successive strapping was found to be useful for stable fruit production, especially in vigorous lateral branches, in Japanese persimmon.

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