Forcing culture of 'Kyoho' grapes in Kagoshima prefecture [Japan]
2001
Nishimoto, N. (Kagoshima-ken. Fruit Tree Experiment Station, Tarumizu (Japan)) | Kumamoto, O. | Kisaki, K. | Sakaguchi, N. | Sano, K.
'Kyoho' grapevines were forced in heated greenhouses following three different hours of chilling at 7.2 deg C. The forcing treatments were initiated beginning either on December 30th of 1995 (470 hours of chilling), February 1st of 1996 (994 hours of chilling), and February 28th (1,402 hours of chilling) of 1996. The control consisted of collecting data on vines growing in the field protective culture. Fruit produced on control grapevines matured between August 13th and September 4th, When forcing treatments were initiated on 'Kyoho' grapevines beginning December 30th, 1995, fruit maturity occurred between July 1st and July 16th, 1996, these were 183 to 198 days following the initiation of the forcing treatments and 43 to 50 days before the control treatments. When forcing treatments were initiated on February 1st, fruit maturity occurred between 169 to 188 days following treatment initiation and 24 to 27 days before the control treatment. Grapes on which late forcing treatments were initiated on February 28th matured fruits between 154 to 173 days into 1996 and 12 to 15 days before the control. Fruit from the early forcing treatment initiated on December 30th had greater the berry skin color (purple) and acidity than did the control fruit or fruit from later treatment dates. From these results, we revealed the growing period of 'Kyoho' grapevines on which those four cultural types were applied in Kagoshima prefecture.
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