EFFECTS OF NITROGEN, POTASSIUM FERTILIZERS AND CLUSTERS PER VINE ON YIELD AND ANTHOCYANIN CONTENT IN CABERNET SAUVIGNON GRAPE
Keywords:
Anthocyanin, phenolic compounds, malvidinAbstract
The experiment was carried out in a humid subtropical climate located in the south of China, inXichang, Sichuan province, (27ºN, 102ºE, and 1650 m above mean sea level) during the 2005 and2006 seasons. Eight year old, irrigated Cabernet Sauvignon vines were planted at Xichang Chia TaiWine & Spirits Co., Ltd. Vine plants were spaced 1.25 m apart with 2 vines and rows were 2.0 mapart and oriented approximately north/south. Vines were trained to a vertical shoot positionedtraining system (VSP), and were bilaterally cordon-trained, spur-pruned, and shoots were verticallypositioned upright. Vines were irrigated by drip irrigation system. The 3 different levels of N-Kwere 0-0, 100-20, and 200-60 g/plant and the 3 different levels of clusters per vine were 10, 20, and 30clusters per vine. Treatments were applied to 1 vine plot, each replicated 6 times in a split plot, inwhich the main plots were clusters per vine. Vine shoot lengths were maintained at 15 nodes byshoot trimming. It was found that the yield of grapes in year 2005 was higher than 2006. Increasingthe rate of N-K in both years did not increase yields, but increased clusters increased yields in bothyears. Color and phenolic compounds in the berries were higher in year 2006 than 2005. At the 0-0and 100-20 levels of N-K the phenolic compounds in the grape were lower than other treatments.It was also found that the Cabernet Sauvignon berry contained more malvidin than otheranthocyanins.
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