Question 2: Why prune the branches of big trees in spring? Big branches will take away a lot of nutrients. In this way, the new branches will not grow well. So cut it down and provide more nutrition for new life.
Question 3: Why do you want to cut off some branches that look strong? In fact, they only absorb nutrients, which is not conducive to the growth of trees, so you should cut them off.
Question 4: In spring, do you cut branches to reduce water evaporation? The significance of physical (1) winter pruning is to prepare for the growth in the next spring. In order to make trees grow well in spring, we should take good care of them in winter. Winter pruning can promote the growth of branches through different pruning methods, or compress them into short branches and flowers. Conducive to the prevention and control of pests and diseases. By thinning branches, we can reduce the branches and leaves of the crown, improve ventilation and light transmission, and thus reduce the occurrence of pests and diseases in the coming year. In addition, winter is the best time to spray sulfur mixture. After pruning in winter, the branches and leaves of trees can be appropriately reduced, and chemicals can be sprayed very evenly, which can prevent and control pests and diseases in the coming year more effectively. (2) Precautions for pruning Most flowers and trees overwinter after forming flower buds. If these buds are pruned in winter, it will seriously affect the next year's flowering. Therefore, how not to cut off flower buds is a problem that must be paid attention to in winter pruning. For tree species without flower buds overwintering, different pruning methods will affect the flowering status of the next flowering period. (3) Evergreen trees are pruned in winter, and plants rely on photosynthesis to maintain their life activities. Therefore, strong pruning should be avoided for evergreen trees, especially in the long winter, and the evergreen trees after strong pruning will not sprout new buds for a long time, resulting in dead branches. If it is necessary to prune evergreen trees vigorously, it should be done in the spring near the germination stage as far as possible. In addition, due to tree species and local climate, evergreen trees will suffer from freezing injury due to the decrease of leaves in winter, while deciduous trees will not.
Question 5: When to prune trees is an important content in garden management and maintenance. As the saying goes, "seven palms, three beheadings". But pruning in winter is more important, that is, pruning in hibernation. The time range is from the end of autumn when the branches stop growing to the germination of the terminal buds in the early spring of the following year.
Because it is in the dormant period, pruning is less harmful to trees at this time, which is conducive to protecting trees. Pruning should be treated differently according to the types of trees. For flowering flowers and trees, all flowers and trees that bloom in spring should be trimmed moderately, only the autumn shoots without flower buds should be cut off, and no more cutting is allowed. So as not to affect the next year's flowering. All the flowers and trees that bloom on the branches of one year, such as roses and hibiscus, should be pruned again to make them blossom and bear fruit in the next year. When pruning deciduous flowers and trees, you should be careful not to prune them before they fall. It should be done after defoliation to avoid excessive loss of nutrients in flowers and trees, which can effectively avoid the infection of trimmed wounds.
Pay attention to the temperature when pruning in winter. It is not easy to prune in cold weather to avoid frostbite of tree wounds. It can be done before the weather gets warmer in early spring and the roots enter vigorous activities. Pruning in winter should be carried out according to the characteristics of trees, working conditions and other factors, in order to achieve the purpose of shaping, promoting growth, wintering and insect prevention. Attention should also be paid to pruning in winter, so as not to hurt the parts near the trunk, and not to leave the residual piles of side branches for too long, so as to promote the early healing of the wound. The incision should be smooth to avoid tearing the bark. It is also necessary to apply a protective agent, such as Kuaihuolin Healing Ointment, to the incision. When pruning, we should also pay attention to the fact that the top lateral buds should stay outside the branches to keep the trees growing outward.
Question 6: Why do you want to prune trees? Pruning trees in time after defoliation is also based on their characteristics, not all trees are like this.
Deciduous trees: From late autumn to early spring, the dormant period of deciduous trees is the best period for pruning. Young trees are mainly plastic; The purpose of forming foliage trees is to control the growth of lateral branches and promote the prosperity of main branches; The formation of flowering fruit trees focuses on cultivating the trunk and main branches of the tree to form a skeleton, promoting early formation and flowering and fruiting in advance. In late winter and early spring, the sap began to flow and the incision healed quickly. Evergreen trees: the new shoots of evergreen trees in temperate and warm temperate zones stop growing in late autumn, and the best time for pruning and shaping in winter is before the dormant buds germinate in the following spring. The tropical and subtropical climate is obviously divided into dry season and rainy season, and the dry season is in a dormant period, which is the best time for pruning and shaping. The lower reaches of the Yangtze River belong to the northern edge of subtropical zone, and the active period of evergreen trees is April-65438+10 every year. Pruning is the best at this time. Pruning in165438+10-March is easy to cause freezing injury. The reason is that the roots and trees of evergreen trees are active all year round, and the metabolites are stored in leaves less, and the nutrients are lost and synthesized more when pruning in winter and spring, which affects the growth of trees. Pruning should be done before germination in late spring.
Question 7: Why do young trees lose their leaves when they cut extra leaves in spring?
1\ defoliation reduces water loss.
In winter, the air is dry and the transpiration of trees is not reduced, which means that trees are easy to lose water and it is difficult to get water. And water is one of the raw materials of photosynthesis. Without photosynthesis, trees can't get energy (energy is produced by starch, the product of photosynthesis). In other words, if water loss is not reduced, trees will die.
Trees without leaves will not reduce too much water in winter, because transpiration is mainly done by leaves, and the withering of leaves can prevent transpiration, so trees without leaves can survive. So we see many trees without leaves.
2\ Blades fall to discharge waste.
In fact, trees lose their leaves all year round. As a living thing, excreting waste is its basic physiological characteristic.
Long leaves
Chlorophyll in trees is mainly concentrated in leaves (trunk and branches also have chlorophyll), and chlorophyll is the main place of photosynthesis. Leaves grow to produce energy substances (starch).
This is the result of biological adaptation to the environment (the result of natural selection)