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通过对山葡萄果实不同采收期的浆果百粒重、品质及酿造后酒质的分析 ,结果表明 ,山葡萄进入 9月份成熟度提高速度加快 ,果实的总糖、色素、游离氨基酸、维生素C含量均呈上升趋势 ;滴定酸、单宁含量均呈下降趋势。酿酒试验结果也证实 ,越到后期采收 ,成熟度越高 ,酒质越好。但是 ,“双优”和“左山一”晚采百粒重下降。因此 ,为了达到质与量的统一 ,获得更高经济效益 ,“双优”的适宜采收期为 9月 16日～ 9月 2 1日 (盛花后 10 0～ 15 0d) ,“左山一”的适宜采收期为 9月 11日～ 9月 16日 (盛花后 95～ 10 0d)。
Through the analysis of 100-berry weight, quality and wine quality after brewing, the results showed that the maturity of the grapes increased rapidly in September, and the total sugar, pigment, free amino acids and vitamin C contents Showed an upward trend; titration acid, tannin content showed a downward trend. Brewing test results also confirmed that the more the late harvest, the higher the maturity, the better the quality of wine. However, “Shuangyou” and “Zuoshan one” suffered a serious decline in the weight of 100 grains a day. Therefore, in order to achieve the unification of quality and quantity and obtain higher economic benefits, the optimum harvesting period of “Double Excellence” is from September 16 to September 21 (after 10 ~ 15 days of full bloom) "The appropriate harvest period is September 11 ~ September 16 (full bloom 95 ~ 10 0d).