Lianas bloom from April to May and bear fruit from August to September. The minimum temperature required for growth is between12 and15 degrees, the optimum growth temperature for flowering is around 20 degrees, and the optimum growth temperature for fruit expansion is between 20 and 30 degrees. For example, the temperature difference between day and night is large, and the coloring and sugar content are good.
Pruning time of vines
1. Pruning vines in spring can be carried out in March-April in spring. At this time, pruning can be carried out by wiping buds, which can erase thin buds, multi-headed buds and budding buds, reduce the loss of nutrients, and make the remaining buds get all nutrients, commonly known as cost-saving cultivation. 2. Prune vines in summer. Prune vines in June and July in summer. Fruit branches and vegetative branches are pitted and slightly treated. In addition, ear plastic surgery, smooth ear, ear thinning, grain thinning and so on. It should be implemented. 3. Pruning vines in autumn can be carried out in September-65438+1October in autumn. Do a good job in the second coring, thinning branches, thin branches, overlapping branches and branches with low lignification. Adjust the number of branches, improve the ventilation and lighting conditions, and make the shelf surface more breathable. 4. Prune vines in winter, which can be pruned from 65438+February to 65438+1October in the following year. Pruning grapes in winter has the largest pruning amount and the largest pruning branches. Pruning at this time can increase the yield of the next year.
Pruning methods and steps of vines
1. When cutting short vines, pay attention to keep a certain distance between the scissors and the bud eyes. If it is too close, it will affect the growth of bud eyes in the coming year. After that, the number of remaining buds should be determined according to the length of the treetops. Shorten 2 buds and choose full buds. 2. Shrinkage is selective pruning, which is a very important job. Because old vines have many branches, they will consume more nutrients, so they should be pruned according to the state of old trees. If it is a weak branch for many years, it is necessary to cut off the weak branch and leave the strong branch for reproduction. If it is a strong branch, the other way around. 3. Sparse is rough pruning. There is a principle of vine rough pruning, that is, six pruning, pruning twigs to leave strong branches, pruning incomplete branches to leave complete branches, pruning distant branches to leave near branches, pruning two branches to leave single branches, pruning underdeveloped branches to leave fully developed branches, and pruning old branches to leave new branches.
Matters needing attention in vine pruning
When pruning vines, pay attention to the smooth and stubble-free cut, and the thickness of the cut should be 1-2cm to avoid the dry winter buds. White latex can be applied to the incision, and it should be placed in a semi-cool, well-ventilated environment, protected from light and watered.