Watering too late or insufficient Spring is the golden season for nursery stock conservation. Watering is critical. Generally, seedlings need to be poured 2 or 3 times in the spring. The key is to return to Qingshui for the first time. Appropriate returning of Qingshui can effectively reduce the temperature of the soil and delay the germination of the seedlings, so as to avoid the dangers of late frost and late spring cold. If watering is too late, the effect of preventing cold and freezing will not be achieved. Generally, the time for pouring back to Qingshui should be more than 3°C in the ground temperature, and it should be carried out after reaching 5°C. In short, the time for watering should be adapted to the local conditions, depending on soil moisture and weather conditions. No matter whether the trees or shrubs return to green water, they must be poured thoroughly. This is beneficial to the downward growth of the roots of the seedlings, and must not be caused by the wet ground of the seedlings, causing the soil to return alkali. Improper demolition of cold protection facilities In order to protect the seedlings from wintering safely, measures such as root and neck soiling, mulch film, wind barriers, insulation sheds, and non-woven wrappings are often adopted. Cold-proof materials should not be completely and prematurely removed, to prevent seedlings from adapting to and harming the night cream, resulting in abandonment of previous work. The removal of cold protection facilities should be treated differently. For the seedlings with roots buried in the ground, the soil may be dug when the water is poured in early spring; the seedlings of the tree wrapped around the ropes should be removed when the sprouts are to be found (such as the large spacing of the grass ropes can be removed without retreating); The flower shrubs should adopt a step-by-step method to dismantle the film, which can be drilled on the south side in the early spring. Since then, the number of punching holes has been increased every week, and the film has been removed in early April. The removal time of windbreaks in the north has stopped at the end of March or after the end of the spring monsoon; According to the weather conditions, the insulation shed can be removed and a small angle can be set off on the southeast side of the shed in advance. After the trees are adapted, they can be completely removed. Windbreak removed prematurely Newly planted larger DBH or larger seedlings of tree crowns are generally provided with brackets. In spring, winds in the northern regions are large, and the brackets should not be demolished prematurely so as to prevent the trees from being damaged by wind and affecting plant rooting. In special circumstances, windbreaks should be reinforced in spring. Not trimmed or improperly trimmed Early spring is the best time for pruning. It is necessary to not only cut off branches and branches, dead branches, but also cut short some of the longer flowering branches. Because the nutrition of the tree is limited, the flower is much more, the flower is relatively small, the flowering period is short; on the contrary, the flower is less, the flower is bigger, and the flowering period is relatively longer. And the flowering needs to consume a lot of nutrients, but at this time the root system is still in the growth stage, too much flowering, is not conducive to the balance between the tree and the root system, easy to affect the growth, and even lead to plant death, especially the late sprouting tree seedlings are not prosperous Be sure to cut branches and short cuts. For spring flowering shrubs such as prunus triloba, Peach, and Meimei, it is also feasible to remove some flower buds in the year of new planting. Improper fertilization In the spring, seedlings grow vigorously, and fertilization can timely supply the plant's flowering and growing nutrients. People often apply large amounts of chemical fertilizers in the spring and ignore organic fertilizers, or pay attention to nitrogen fertilizers, but ignore phosphorus and potassium fertilizers, or apply the same fertilizer regardless of plant material. These practices are not appropriate. Ignoring Pest Control Some people think that high temperatures and high humidity in summer are frequent pests and diseases, and they often do not pay enough attention to the prevention and control of diseases and insect pests in the spring. As a result, some seedlings grow poorly or die. Seedling diseases and insect pests in spring should be based on prevention, and different measures can be taken according to the ecological habits of trees and the occurrence of pests and diseases. For example, in the early spring spraying thiophanate-methyl or Baume 3 to 5 degrees lime sulfur and other prevention and control of Lagerstroemia coal pollution, can also be used to prevent white poplar trunk ulcer disease, Bi peach, cherry blossoms, Purple Lee gum disease Wait. In the spring period, the moths are mothed by hand; in addition, some pests that overwinter in the trees can be controlled by measures such as trunk injection and root embedding. Proper prevention can do more with less. 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