Study on the Fall Production of Wine Grape in Taiwan
|Keywords:||葡萄產業研究與發展研討會專集;Proceedings Of A Symposium On Grape Industry Research And Development||Issue Date:||Dec-1988||Publisher:||台中：農業試驗所||Start page/Pages:||80-91||Source:||葡萄產業研究與發展研討會專集:||Abstract:||
In order to decrease the acidity of winter crops of wine grape in Taiwan, this study has made to switch the harvest in October and November to make the fall production. Under the warmer fall season, the malic acid content in the berries would be reduced because of the higher respiration rate. And the fall crops was possible to make the superior quality of wine grape in Taiwan.
First, the inflorescence of first crop was removed. Then, by means of Scanning Election Microscopy, the developmental stages of inflorescence primoderia in the latent bud was observated from 16/5 to 6/8 once every two weeks in 1985, to evaluate the position of pruning node. After that, different pruning period treatments (3/7, 19/7, 6/8 & CK) and different pruning method treatments (defaliation and undefoliation) were carried out to produce the fall crops in 1985 and 1986.
It was showed that pruning on the eighth node was advantagous. The investigation data indicated the earlier pruned it is, the less malic acid in the berries will be; and the yield of undefoliation pruning treatment was higher than the defoliation pruning.
Therefore suggestion was made that undefoliation pruning carried out during the early to middle of July was of advantage to quality and quantity. In other words, berries harvested in late October to middle November could be granted the better quality and the higher yield.
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