An off-season planting construction plan in Tianjin?

What exactly does the off-season planting construction plan in Tianjin include? The following Zhongda Consulting Tendering Teacher will give you answers for your reference.

In many current greening projects, due to the needs of special time limits, greening must break seasonal restrictions, overcome unfavorable conditions, and carry out non-normal seasonal construction. During the construction of this project, in order to achieve excellent quality of this project, the construction party needs to continuously study and summarize the construction technology in abnormal seasons during the construction, thereby effectively improving the survival rate of greening construction in abnormal seasons and ensuring economic and social benefits. . 1. The meaning of counter-season planting is counter-season planting, that is, planting seedlings in seasons that are not suitable for greening. Greening construction is carried out due to the characteristics of low survival rate of seedlings, slow rejuvenation of form, and difficulty in construction and maintenance. Landscaping construction is mainly the planting process of garden plants. The internal conditions for the survival of plantings are mainly the balance of growth potential. The biggest reason for the death of plants is that the roots of plants absorb water and nutrients. Due to the large transpiration of plants due to the growth of stems and leaves, they need water and nutrients. Caused by long-term imbalance of material balance of payments. 2. Conditions for off-season planting Tianjin has a warm temperate continental monsoon climate. Generally speaking, there is not much annual precipitation and the climate is relatively dry. The hot period in summer is long, the rain and heat are in the same period, the precipitation is relatively concentrated, and the winter is cold. Planting trees in the appropriate season also varies depending on the tree species. In addition to having different physiological characteristics, various trees also have their own characteristics. Some trees are suitable for both late autumn and early spring, such as cedar, triangle maple, five-cornered maple, etc.; some trees are suitable for late autumn, such as whitebark pine, sophora japonica, etc.; many years of tree planting experience have shown that in general, some tree species are better planted before germination, but some trees It is better to plant when they are sprouting, such as black locust, tallow tree, metasequoia, etc.; if planted late, it will not have much impact on survival, such as tree species with strong adaptability, poplars, willows, flowering shrubs with shallow roots and many fibrous roots. , such as clove, forsythia, etc. 3. Off-season planting technology. Generally, greening construction is carried out in spring and autumn. However, in some special cases, in order to meet the construction deadline and see the greening effect as soon as possible, it is required to break through the seasonal restrictions, mainly in summer and winter. In order to ensure the survival rate of seedling planting, the following aspects should be carried out: (1) Soil treatment before planting 1) Tianjin Binhai New Area such as Tanggu, Dagang, Hangu and other areas, due to the coastal area, most of the soil is saline-alkali soil, so it needs to be done For underground salt discharge treatment, after completing the underground salt discharge project, backfill with planting soil that meets the requirements. The soil for planting seedlings in abnormal seasons must ensure sufficient thickness, fertile soil, and good air permeability and drainage. Before planting or sowing, the physical and chemical properties of the soil in the area should be tested and analyzed, and corresponding measures such as disinfection, fertilization, and soil removal should be taken. 2) Introducing planting soil. If the soil of the planting site contains construction waste soil and other harmful components, or is strongly acidic, strongly alkaline soil, saline soil, saline-alkali soil, clay, sandy soil, etc., the planting soil should be introduced or improved according to the design regulations. Soil technical measures. 3) Construct the terrain according to the design requirements. Apply sufficient base fertilizer to the lawn planting land, flower fields, and sowing land, plow 25~30cm, level and rake finely, and remove debris. The flatness and slope should meet the design requirements. (2) Select seedlings for off-season planting. When the seedlings are larger in size, dig them with soil balls in the appropriate season, and prune the crown appropriately. They can be half-buried underground with wooden boxes, bricks, woven bags, etc., cultivated with high soil, and managed normally. When planting is needed, the root system of the seedlings is basically unharmed, and the crown can be left unpruned and kept in its original shape, which can meet certain temporary special requirements. The roots and stems of aquatic plants should be well developed, the plants should be strong and free of diseases and insect pests. For large-sized seedlings that have not been excavated in advance, planting is urgently needed for greening project construction. The seedlings should be root-cut in advance, fully wrapped and covered with soil and watered. After 15-20 days, new roots will have formed in the soil ball. They can then be hoisted, transplanted, and the pipes strengthened. With the maintenance measures, the transplanted seedlings have better shape and growth potential. (3) Pruning before transportation In order to reduce the transpiration of the tree crown, the seedlings should be roughly pruned before transportation, that is, before they emerge. Generally, 1/3 to 1/2 of all branches and leaves should be cut off, and dead branches and branches damaged by diseases and insect pests should be cut off at the same time. Do not cut off the tops of trees with obvious top advantages. In addition, for bare-root seedlings, only the main root without fibrous roots is shortened to encourage the development of fibrous roots. Before transporting plants, the branches should be thinned and leaves removed, the cuts should be smooth, and larger wounds should be smeared with wound healing agent to prevent infection. (4) Transportation If the seedlings are transported over long distances, the bare root seedlings should be treated with roots dipped in mud and then wrapped in wet grass. The big tree should be placed on the car with its crown tilted toward the rear of the car, and soft materials should be used to cushion the contact between the tree and the car's side to prevent the bark from being abraded.

Seedlings should be transported in vehicles with scaffolding and shade and wind protection. Large seedlings should be loaded with roots in front and stems in rear, arranged in order. Seedlings are required to be installed upright, in single packages, with partitions in the middle, and in layers. If the transportation time exceeds 4 hours, cooling packages should be prepared, and measures such as water spraying and humidification should be taken along the way. (5) Before planting, prune the root system of the seedlings, remove split roots, diseased roots, and overly long roots, and prune the crown to maintain the balance between the above and below ground of the tree. Before the seedlings arrive, the ground must be prepared in advance and the tree pit dug. It is best to plant them as they arrive. Seedlings that are too late to be planted must be planted in time and shaded. The planting pit should be larger than normal, and the bottom of the pit should be backfilled with good soil plus base fertilizer. Before planting, the holes should be soaked with 1~3% disinfectant and 5~8% rooting agent respectively. Water should be poured as the plant is planted, water thoroughly, and support the seedlings once after watering. According to the diameter of the seedlings at breast height, determine the soil ball specifications of the seedlings. The planting hole should be enlarged and deepened (usually about 30cm larger than the soil ball), and a permeable layer should be made to ensure repeated watering and moisturizing during high temperature periods without water accumulation. 4. Planting and maintenance management (1) Maintenance 1) Water as soon as possible after planting to promote new roots, and also add a certain concentration of auxin. The crown leaves should be properly shaded with a shade net for 10 to 15 days, and a sprayer should be used to spray water on the leaves. 2) In areas with dry soil, water-retaining agents can be used during planting, which can absorb water 10 times or even hundreds of times greater than its own volume, store it, and then slowly release it as the surrounding environment changes to meet plant growth. Moisture required during the process. 3) In areas prone to sunburn, use straw ropes to wrap them dry and spray water appropriately on the straw ropes. (2) Management of off-season construction. An important link is watering. Usually, the "three water" must be closely followed to ensure survival. The frequency of watering is more than that of normally planted trees, and the branches and leaves are shortened to varying degrees according to different varieties. Spray germination inhibitors and evaporation inhibitors to inhibit germination and reduce evaporation of water from the leaves. When irrigating, you can mix in hair root accelerator to promote hair roots. For old trees, valuable trees or trees that are not growing well, it is best to cut off the roots if time permits. The ideal time for root cutting is the first spring, the second spring or the third spring for transplanting. Transplantation under cloudy or shading conditions is beneficial to survival. 1) In order to retain moisture, wrap straw rope around the main trunk and larger side branches of the plant, then spray the wrapped area with fungicide, and finally tie it tightly with film. 2) According to the weather conditions, when the humidity is low, spray moisturizing. When the soil moisture is not enough, the roots should be watered in time, so as to achieve the principle of neither drying nor watering, and watering thoroughly. 3) During the high temperature period, always beware of the growth of fungi and spray fungicides according to the actual situation every 3 to 5 days. 4) The plants should be sprayed with foliar water frequently to moisturize, and 2‰ of urea and trace elements should be added to the water to ensure the supply of nutrients to the leaves.

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