1. 厳冬期以降のブドウの冬芽の雪中での耐寒性変化.
- Author
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春日純, 西龍一郎, and 廻渕凌匠
- Subjects
SNOW cover ,ATMOSPHERIC temperature ,GRAPE growing ,LOW temperatures ,CULTIVARS ,GRAPES ,WINTER ,ACCLIMATIZATION - Abstract
In areas with heavy snowfall in Hokkaido, grapevines overwinter under the snow. Recently, it was suggested that winter buds of several grape cultivars grown in cold areas deacclimate at 0°C. Because the temperature in the snow is maintained at high subzero ranges, deacclimation of grape buds in areas with heavy snowfall might occur earlier than expected. In this study, we investigated the relationship between the temperature in the snow and freezing resistance of grape buds when grape canes were buried in the snow for 1 week. Compared with the outside air temperature, the temperature in the snow was fairly stable. The means were approximately -4°C and -3°C in middle and late February, 2023 in a vineyard in the Tokachi region, respectively. In these temperature conditions, the freezing resistance of winter buds of a cold-hardy interspecific hybrid grape cultivar 'Yamasachi' did not decrease significantly, suggesting deacclimation of the winter buds hardly occurred at lower temperatures than -3°C. It was reported that cold-hardy interspecific hybrid grapes tend to deacclimate earlier than European cultivars. Because European cultivars are mainly grown in areas with heavy snowfall in Hokkaido, significant decrease of freezing resistance of grape buds might not occur under the snow cover in such areas. [ABSTRACT FROM AUTHOR]
- Published
- 2023