When and how to prune northern grapes in winter?

When pruning grapes in winter, we must control the time, neither too early nor too late, otherwise it will affect the germination of the next year and be unfavorable to growth. Usually choose 30 days before the trees enter the dormant period to the bleeding period. The specific time is between the end of 65438+ 10 and the middle and late of 165438+ 10. If it is cultivated in greenhouse, it should be carried out before plastic film mulching.

First, the winter cutting time

The pruning time of grapes in winter must be well controlled, not too early or too late, otherwise it will affect their storage nutrition and is not conducive to the germination and growth of the next year. The best time is from dormancy to 30 days before bleeding. If it is cultivated in greenhouse, it should be done before plastic film mulching. The specific time is between the end of 65438+ 10 and the middle and late of 165438+ 10.

Second, the pruning method

1. Pruning length: When pruning, the specific pruning length depends on its growth, fruiting branch rate and flower bud height. Under the same conditions, stout and well-nourished branches should be kept for a long time, weak branches with uniform distribution should be cut short, extended branches should be kept long, and prepared branches should be cut short. In addition, if fertilizer and water are insufficient, pruning is mainly short in arid areas.

2. Trimming position: the tissue at the cutting position will be loose and the water will easily evaporate. Therefore, when pruning, the cutting position should be about 2-4 cm away from the bud eye to prevent excessive evaporation of water and increase the number of dry branches. The incision should be opposite the cut bud.

3. Bud retention: Bud retention should be well controlled, not too dense or too sparse. Usually it is twice the amount of buds left in the next spring. If 15-20 buds are left on the new tip of the hedge frame, then 30-40 buds will be left in winter pruning. If short branches are pruned, the result will be 8- 10 mother branches.