ISHS Acta Horticulturae 984: VII International Symposium on Mineral Nutrition of Fruit Crops
EFFECTS OF NITROGEN, POTASSIUM FERTILIZERS AND CLUSTERS PER VINE ON YIELD AND ANTHOCYANIN CONTENT IN CABERNET SAUVIGNON GRAPE |
| Authors: | V. Boonterm, A. Silapapun, N. Boonkerd |
| Keywords: | pruning, trimming, wine colour, phenolic compounds |
| DOI: | 10.17660/ActaHortic.2013.984.54 |
| Abstract:
The experiment was carried out in a humid subtropical climate located in the south of China, in Xichang, Sichuan province, (27°N, 102°E, and 1650 m above mean sea level) during the 2005 and 2006 seasons. An eight-years-old, irrigated Cabernet Sauvignon vineyard was selected at Xichang Chia Tai Wine & Spirits Co. Ltd. Vines were spaced at 1.25 m x 2.0 m and oriented approximately north/south. Vines were trained to the vertical shoot positioned training system (VSP), and were bilaterally cordon-trained, spur-pruned and shoots were vertically positioned upright. Irrigation was by drip system. Treatments were 3 different levels of N-K application: 0-0, 100-20 and 200-60 g/plant and 3 different levels of clusters per vine: 10, 20 and 30. Each plot consisted of 1 vine, with 6 replications per treatment in a split plot design, in which the main plots were clusters per vine. Shoot lengths were maintained at 15 nodes by shoot trimming. The yield of grape in 2005 was higher than 2006. Increasing the rate of N-K in both years did not increase yield, but increased the number of clusters enhanced yield in both years. Colour and phenolic compounds in the berries were higher in 2006 than 2005. The phenolic compounds in the grape were the highest under the highest rate of fertilizer. Cabernet Sauvignon berries contained more malvidin than other anthocyanins. Wine quality (colour and balance of acidity, tannins, and alcohol) were better when derived from grape berries with higher quality, which could be quantified by colour and phenolic compounds in the berries. | |
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