Then, since it didn't die, why didn't it germinate and grow new buds and leaves? Generally speaking, if there is no problem, grapes will sprout and spread their leaves on time in spring. If the grapes are still stuck in the soil like dead branches when the leaves sprout, it means there is something wrong with the vines. This situation is usually called fatigue, that is, for various reasons, the grapes are out of balance in nutrition, or the trees are temporarily dormant and do not germinate when they should germinate. There are many reasons why leaves don't germinate in spring, but in most cases, the following three reasons are more common.
First, the tree was frozen. In winter and spring, if you don't pay attention to cold protection, the vines are most vulnerable to freezing, especially after the roots are frozen, they will not germinate in spring. After the root system is frozen, the root epidermis will be diseased, and it is impossible to transport nutrients to the branches. The branch has not dried up in a short time, so when we look at this branch, we will find that it is still green. Except that the root system does not germinate when it is frozen, after the phloem of branches is frozen, the nutrients produced by photosynthesis of leaves cannot be transported to the root system, which will cause respiratory failure and stop the absorption and transportation of water and nutrients, and will still not germinate in spring. At the same time, because the bud eye is frozen, the "blind eye" will not sprout.
Second, improper planting management. If the root system of newly planted grapes is damaged too much, planted too deeply, watered too much, buried too often, and the soil moisture is not good, it will lead to weak growth and then "budding phenomenon". In addition, if the grape load was too high last year, we didn't thin the flowers and fruits in time and hung too many fruits. In this case, if there is no supplementary nutrition, the grape nutrition will be unbalanced, which will lead to no germination in spring. In addition, due to the lack of pruning to improve illumination, proper water and fertilizer management, excessive bleeding and other reasons, the branches and vines are too blind to germinate, even if they germinate irregularly.
The third is the influence of pests and diseases. It goes without saying that pests and diseases have done harm to this. Grape will not germinate after many diseases and insect pests, such as Fusarium wilt, brown rot, bud blight and so on, which are the main factors and reasons for grape not to germinate.
Therefore, in order to make grapes germinate and spread their leaves smoothly in spring, we must do a good job in peacetime, instead of waiting until spring comes to accelerate germination through various measures to improve germination rate. As long as the management of vineyards is in place, there are few vineyards that do not germinate in spring. Even if there is, it is only a few branches, and there will be no large-scale non-germination. Therefore, in order to effectively improve the germination rate of grapes in spring, the following work must be done:
Strengthen fertilizer and water management. In fertilization, besides applying organic fertilizer in time after picking, we should also pay attention to applying bud fertilizer in spring. Spring sowing fertilizer should be mainly nitrogen fertilizer, and a small amount of organic fertilizer can also be added. Germination accelerating fertilizer is generally applied half a month before germination. Weak trees can be given more, and strong trees can be given less. In addition, frozen water should be sealed according to the soil conditions, and drainage should be done well in the months when rainfall is concentrated.
B pay attention to cold and antifreeze. In the case of continuous low temperature, measures such as covering soil, covering and painting should be taken to prevent cold, especially the roots. If the grapes are frozen, you can water them first and then cover them with straw curtains. After the main vine is covered, peel off the soil around the roots, cut off the dead roots from the base, keep the elastic roots that are half dead, and spread humus soil on the half dead roots. The lowest temperature for the growth of grape new roots is 65438 05℃, and the optimum temperature is 25℃ ~ 28℃. If this temperature condition is maintained, new roots will be produced in about half a month, and will enter normal management with the growth of new roots.
C reasonable plastic trimming. Grape pruning is very important, not only for ventilation and light transmission, but also to promote the germination and growth of more new shoots. At the same time, the new shoots are easier to be managed in order, and sufficient leaf area can be maintained at the initial stage of growth, which is beneficial to the growth of plants and can improve the germination rate and germination uniformity.
D accelerate germination in time and effectively. Measures can be taken to accelerate germination in spring, such as spreading plastic film, re-cutting in spring, throwing strips to accelerate germination, spraying nutrients and watering germination water. But the premise of accelerating germination is to ensure that the bud eyes are not "blind", the branches are not withered, and the roots are good. If these conditions lead to no germination, even if we accelerate, it will not germinate. Therefore, in addition to the above management, we must pay attention to the prevention and control of pests and diseases to ensure the health of trees, and then through timely and effective germination, the germination rate of grapes in spring can be improved.