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Violating the principle of suitable land and suitable trees Suitable land is the basic principle of tree planting. It has two meanings. The first is that the trees are adapted to the soil and climate conditions of the planting land; the second is the small environment with specific planting areas (eg, The industrial and mining areas are low in pollution or high dry, leeward sunny, Yinshan, after the building and so on. If the environmental conditions of the trees are neglected, planting them in unsuitable places will inevitably result in trees not being planted. Of course, it is possible to artificially create an environment that adapts to the growth of a certain tree, but it must be recognized that this creation is limited by technological and economic constraints. Implantation period is not suitable: the planting of trees should be selected in the period when the amount of transpiration is minimum and it is conducive to the restoration of water balance in the root system, generally after the fall from autumn to the spring before germination. If planting in the growing season, appropriate protective measures should be selected, such as continuous rainy days or shading, otherwise it is not conducive to the survival of the trees. The seedling age is too large or too small: Generally, the seedling plants are short, easy to dig, have low root injury rate, and have strong nutrient growth, strong regeneration, and easy restoration of transplanted and trimmed branches. However, plants that are too young are vulnerable to external damage, have poor stress resistance, and are difficult to exert their afforestation effect. The trees of the age-old trees are tall, they are difficult to transplant, they are complicated to construct, and they are costly. Therefore, they should not be used in excess of special circumstances. Age tree. Practice has proved that urban greening and tree planting, deciduous trees are generally 5-10 cm thick, and evergreen trees are 1.5-3 cm. Flowering shrubs are 2-4 years old. However, do not use young seedlings or fertilizer seedlings. The young seedlings have weak viability, stunted growth, and the young tissue of the fertilizer seedlings is unreal and poor in stress resistance. The quality of the excavation seedlings is poor: After the seedlings are selected, the diameter of the roots of the bare root seedlings should be 8-10 times the DBH of the stems after the seedlings are selected, 6-8 times larger than the diameter of the seedlings, and the diameter of the earth ball with soil ball seedlings should be The 1/2-1/3th of the height of the seedlings, the diameter of the flower shrubs is about 1/3 of the diameter of the crown, and it is necessary to ensure that the roots and stems in the reserved range are not damaged, otherwise it will affect the survival rate of the trees. Seedling water loss before lifting: Before raising seedlings, pay attention to whether the seedlings are too dry. In particularly dry areas, although some seedlings grow, shoots are dehydrated and it is difficult for transplants to survive. This is particularly the case for small, cold-tolerant flowering shrubs. Poor soil quality in planting areas: Urban planting trees are often poorly soiled, or contain rubble or rubble, or have unpleasant plant growth impurities such as lime. They need to be completely removed and the size of tree holes should be increased. Seedlings are not planted in time: The seedlings are not planted in time, causing water loss in the roots and affecting the survival rate. It is advisable to take measures such as covering, water spraying, muddy mud at the root, etc., which need to be transported over long distances. In case of special circumstances can not be planted in time, to leave a good planting. Individual fleshy root species can be planted after proper drying. Depth of planting is not suitable: Generally, deciduous trees are more than 5-10 cm from the original soil, and evergreen trees are more than 3-5 cm from the original soil. The flowers and shrubs are equal to the original earth and India, but they must not be too deep. When planted too deeply, the roots are poor in air permeability and cause rot. Fill the soil is not true: when filling, the planting soil should be layered and filled into the collapse, and the larger soil blocks should be crushed and then filled into the pits to prevent the survival of the root system from emptying and absorbing the water. Watering is not timely: Seedlings should be watered in time after planting, and must be thoroughly immersed to prevent the soil from sucking down the water from the roots of the seedlings and affecting the survival. Usually, water is poured within 24 hours after planting, second water is poured every 3-5 days, and water is poured every other week. After each watering, it is necessary to check whether the trees are tripped or not, whether there is a crack in the planting soil, and seal the pits immediately after Sanshui. Seedlings with pests and diseases: Before the emergence of seedlings should be observed to see whether it has pests and diseases, seedlings with pests and diseases weak, poor resistance, not easy to survive. Inappropriate conservation and management: As the saying goes, “three minutes and seven minutesâ€, the maintenance and management after planting is very important. According to the growth habits of different tree species, do a good job in the post-management work, especially in the dry season, we must pay attention to watering. But we must pay attention to watering not too much, to prevent the root system from breathing poorly, pay attention to drainage in the rainy season, do a good job of pest control work in time, and take care to prevent sunshine burns in the summer. For trees that are not very hardy, you should do a good job of preventing cold in winter.