EFFECTS OF PRUNING TIMES ON YIELD AND QUALITY OF WINEGRAPE
Abstract
The research of three difference winegrape varieties (Cabernet Sauvignon, Merlot, and Zinfandel) was carried out in humid subtropical climate located in the south-west of China (Xichang, Sichaun prov-ince) with 5 years old winegrape. Planted by own root cutting in 1998 spacing was 1.25-2.00 m in north-south direction. The pruning times of winegrape were on 10 Jan., 15 Jan., 30 Jan., 10 Feb., and 20 Feh.The results indicated that there was significant difference between varieties, especially yields, number of clusters per vine, TSS and pH. Pruning times had affected on number of cluster and yields but no affected on TSS, TA and pH. The interaction had affected on yields and TSS. Merlot and Zinfandel obtain the maximum yields when there were pruned on 30 Jan. Delay pruning times of winegrape var.Cabernet sauvignon increased TSS, the time from bud break to harvest and degree day. Merlot variety had increased the time from bud break to bloom, bud break to harvest and degree day. Zinfandel certainly responses. For the yields and quality on this research the best times of pr negrape varieties Cabernet Sauvignon, Merlot and Zinfandel was 30 Jan. to 20 Feb.,Jan. and 30 Jan. respectively.
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