The improvement of the survival rate of large trees in the construction of greening projects is an important measure to ensure the quality of projects and increase their efficiency. Here, according to actual experience, the author introduces the following practical and feasible technical measures for the constructors' reference.

First, try to shift trees during the dormant season.

If it is not a special time limit, transplanting of large trees should be carried out as far as possible during the dormancy period of trees in autumn and spring. During the dormant period, the tree roots have strong resistance to root cutting and less transpiration of the tree, which is beneficial to the growth of roots and long leaves.

Second, crown processing. If the project allows, the transplanted trees must undergo a cut of the crown, and generally one third of the crown should be truncated. Cutting the crown can reduce the transpiration area of ​​the tree, which is beneficial to the balance between the roots and the roots. It is beneficial to improve the survival rate. Some greening projects require the planting of a large tree crown. For such a large tree, a small amount of branches may be cut off without affecting the styling, and the whole tree may be sprayed with a transpiration inhibitor. In addition to such measures, large trees transplanted in the growing season must be shaded with shade nets as much as possible.

Third, the root treatment. The transplanting of large trees is generally required to shave trees with earthballs. The diameter of earthballs is required to be approximately 10 times the diameter of the trunk. If the soil of the trees to be transplanted is not easy to form earthballs, it should be expanded as much as possible. Root disk and keep the roots of the root as much as possible. Before the trees are put into the ground, the roots must be trimmed, and the cut roots should be cut with quick shear so that it will be beneficial to the growth of new roots. Before the big tree enters the hole, it is necessary to fully spray the tree roots to promote the growth of the plant growth promoter. The author's experience, using "big care" is a more reliable method. The usage of B&R is generally 10000-15000 times. It is best to use a motorized high-pressure sprayer for spraying, so that the liquid can be fully applied at the roots of large trees and play a role.

Fourth, pay attention to soil adaptability. Most of the green areas are built in cities. Most of the soil in urban areas is not suitable for the growth of some green trees. This is an important reason why some large trees are not prosperous after transplanting. Therefore, the soil in the planting area must be analyzed before planting trees. Unsuitable soil quality must be changed. For example, cedar, Chinese pine, and black pine require sandy soils with acidic soils. These trees must be grown on PH soils for a long time. Therefore, it is necessary to change the acidic soil or plant alkali-resistant species such as white wax. .

Fifth, planting operations. Always remove the root wrap completely before planting. In order to protect the soil ball with straw rope, most of the large trees think that the rope can rot after entering the soil. Therefore, it is not correct to put the tree into the pit without filling it. Wraps are not removed, which is not conducive to spraying growth promoters at the roots, and also the roots can not fully contact the backfilled soil, which is not conducive to the growth of new roots. The backfilled soil must be filled with water after it has been compacted. The irrigation operation must be carried out in a particularly serious manner. It should be inserted under the water while using wooden sticks, so that the backfill soil can fully fill the tree pits and contact the roots under the action of water. If necessary, it can be used to irrigate water again after the irrigation water infiltration. The tree pit is fully filled. After irrigation, dry soil is used to cover the flat roots of the plastic film in order to increase the ground temperature and promote the growth of new roots.

Sixth, after the maintenance. After the big trees are planted, in addition to the necessary support, foliar supplementation is a necessary measure to ensure survival and quickly restore tree vigor. When large trees are transplanted, they are cut off a large part of the root system. Therefore, nutrition will not be supplied for a long time before the root system recovers. In order to solve this problem, extra-root fertilizer has become an inevitable choice. Root fertilizer can choose to hang nutritious bags, but for big trees, the leaf surface has a large area of ​​fertilizer and is absorbed more quickly. 0.3% urea solution and 0.3% potassium nitrate solution can be sprayed alternately every 10 days until tree vigor is restored.

The above measures can be adopted whether transplanting large trees or transplanting large fruit trees.

Chemical Raw Materials

There are many kinds of chemical raw materials and they are widely used. There are five to seven million chemicals in the world, and more than 100,000 chemicals are sold in the market. More than 1,000 new chemicals are produced every year, and 150 to 200 of them are considered carcinogens.Chemical raw materials can be divided into organic chemical raw materials and inorganic chemical raw materials.Folding organic chemical raw materials
They can be classified as alkanes and their derivatives, alkenes and their derivatives, alkynes and their derivatives, quinones, aldehydes, alcohols, ketones, phenols, ethers, anhydrides, esters, organic acids, carboxylate, carbohydrates, heterocycles, nitrile, halogenates, aminoacyls, and others
Folding inorganic chemical raw materials The main raw materials of inorganic Chemical Products are sulfur, sodium, phosphorus, potassium, calcium and other chemical minerals (see inorganic salt industry), coal, oil, natural gas, air, water and so on. In addition, many byproducts and wastes of industrial sectors are also raw materials of inorganic chemical industry, such as coke oven gas in the coking production process of the iron and steel industry, which contains ammonia can be recycled into ammonium sulfate with sulfuric acid, and sulfur dioxide in the smelting waste gas of chalcopyrite, galena and sphalerite can be used to produce sulfuric acid.

Hexylamine,DL-Benzoin,Triallylamine,Chlorendic Acid,Phthalhydrazide

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