Rainfall Effect of Rainfall on the Quality of Wine Grape during the Ripening Stage at the East foot of Helan Mountain

doi:10.3969/j.issn.1000-6362.2020.03.004

Abstract

Abstract: In order to study the effect of rainfall at the ripening stage on the quality of wine grape, taking Cabernet Sauvignon as the main variety, the artificial rainfall experiments on grapes were conducted at the beginning of September in the region of the Helan Mountain East, located in Ningxia Hui Autunomous Region(38°16′N, 105°58′E).The soil type is light sierozem, and the grape plant is 5-year-old Cabernet Sauvignon of the winery. The natural rainfall from September 1 to harvest (10.3mm) were taken as the control (CK), and four different rainfall treatments were designed: P1 (20.3 mm), P2 (40.3 mm), P3 (50.3 mm) and P4 (60.3 mm),which including the total of natural and artificial rainfall. At the end of September, the grape fruits from four treatments and CK were sampled, separately, and the six substances of fruit juice including soluble solids, reducing sugar, titratable acid, total phenol, tannin and anthocyanin were tested. The results showed that the content of soluble solids, reducing sugar, sugar acid ratio and total phenol had the same trend, climbing firstly and then fell down with the increase of rainfall, while the content of titratable acid and anthocyanin presented the opposite trend. The contents of tannin were fluctuation with the increasing of rainfall, the values were all higher in four treatment than the control. In general, the rainfall which was less than10.3mm or exceeded than 40.3mm would have a negative impact on the quality of wine grape. When the rainfall is 30mm (the total rainfall is 40.3mm), the quality of grape berry is the best.

Key words: Cabernet Sauvignon, Rainfall, Wine grapes, Fruit quality

CLC Number:

JIANG Lin-lin, WANG Jing, ZHANG Xiao-yu, CHEN Ren-wei, HU Hong-yuan. Rainfall Effect of Rainfall on the Quality of Wine Grape during the Ripening Stage at the East foot of Helan Mountain[J]. Chinese Journal of Agrometeorology, 2020, 41(03): 156-161.

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