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New planting seedlings in the spring is in the wrong zone
Watering too late or not enough Spring is the golden season for seedling maintenance. Watering is very important. Generally, seedlings need to be poured 2 or 3 times in 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 adjusted according to 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-proof facilities In order to protect the seedlings from wintering safely, measures such as root and neck soil, cover 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 can be dug when the water is poured in the early spring; the seedlings of the tree wrapped around the rope can be removed when the sprouts are to be found (such as large spacing of the grass ropes can be removed, and continue to retain); 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 spring monsoon has stopped; 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. Windbreaks removed prematurely Newly planted with larger DBH or larger seedlings of the tree crowns are generally provided with brackets. The spring in the north is windy and the brackets should not be dismantled prematurely so as to avoid wind damage to the trees and affect plant rooting. In special circumstances, windbreaks should be reinforced in spring. Not pruning or trimming improperly Early spring is the best time to trim. It is necessary to not only cut off the branches and branches of pests and 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 seedlings sprouting late and not flourishing seedlings Be sure to cut branches and short cuts. For spring flowering shrubs such as Prunus triloba, Peach, and Mei Mei, it is also feasible to remove some of the flower buds in the new planting year. Improper fertilization is a period of vigorous growth of seedlings in spring, when fertilization can timely supply plant flowering and growing nutrition. 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 summer temperatures are high and humidity is high. This is due to the frequent occurrence of diseases and insect pests. It often pays insufficient attention to the prevention and control of pests and diseases in the spring, resulting in poor growth or death of some seedlings. 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 poplar trunk whitening method of ulcer disease, Bi peach, cherry blossoms, Purple Lee gum disease Wait. Artificial moths are mothed during the spring period; in addition, some pests that overwinter in the tree can be controlled by measures such as trunk injection and root embedding. Proper prevention can do more with less.