Winter pruning of vines is a more complex and critical technology. The quality of the year's pruning can affect the growth and development of the grapes in the next year or even 2 to 3 years later. Properly mastering the trimming technique is crucial.

The winter shearing period of the grapes cultivated in the greenhouse during the pruning period should be completed after the grape plants have completely entered deep dormancy after defoliation. It is generally completed from the beginning of December to the end of December, which will affect its subsequent management work too late.

The pruning method determines the specific method of pruning according to the different types of cultivation, the characteristics of the variety, and the strength of the tree. First, cut off the pests and diseases, too thick (connected to the main branch, the result of the mother base diameter of 1.5 cm or more) too fine branches.

1 Different types of trimming: The greenhouse cultivation type generally adopts a fence frame, a V-shaped frame and a small scaffolding. The fence was used two years before the fruit was hung, and the V-shaped frame was mainly used after the fruit was hung. When the hedge trimmer is trimmed, the orientation of the mother branch vines is left to keep the branches of the grape buds upward; the V-frame results that the selection of the mother vines should be biased to the sides; if the small scaffolding is relatively dense due to the fixed plant spacing, the dragon should be adopted. The shaping method of the rod directly selects the mother branch on the main vine.

2 Pruning according to the characteristics of varieties: Most Eurasian species have the disadvantages of strong growth and flowering difficulties in local cultivation. The fruit quality of greenhouse cultivation is better than that of European and American hybrids. Such as purple crisp, early red, summer to red, etc., the pruning of such varieties should use medium and long-length cutting heads, the result of the mediocre mother leaves 4 to 6 buds short. The result of the strong growth leaves 6 to 8 buds. The amount of buds per mu is 7000-8000, which is adjusted when the hair can be identified after the shoots are taken. The moderate growth of Yichenghua, such as Ziyu, Venus, Nucleus, Rattan, etc., carried out 2 to 3 bud short-cut re-cuts on the resulting female branches, and the amount of buds per mu was about 5,000.

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