With the improvement of living standards of urban residents, people in cities have increasingly focused on their own living environment in recent years. Big trees play an irreplaceable role in the construction of urban eco-environment, so large trees into the city came into being. The so-called "big tree" refers to those tree species that are tall or have a long ornamental tree, such as Xiang Tan, Lapu Tree, Ginkgo biloba, Osmanthus fragrans, Sakura, and Eucalyptus. They are transplanted from rural or mountain areas far away from the city. Greening in the city. 1 Preparation of trees before transplanting 1.1 Collecting Information Including the climatic conditions of the area where the transplanted species are located, such as temperature, light, monsoon direction, and soil. Season choice 1.2 It is better to select transplants for the evergreen and deciduous trees in winter and spring respectively, because during this period, most trees are in semi-dormancy, dormancy, or temporarily stopped growing (12 times in April of one year). Storage of sufficient nutrients, after transplanting, the temperature gradually rises, the rainfall increases, the ground temperature increases, is conducive to transplanting the roots to sprout and grow, so the survival rate is higher. 1.3 Grafting According to the requirements of transplanting trees, the transplanting base should be made of breathable, water-permeable, sandy and loam soils with a deep layer of fertile sandy soil or acid soil, then dug a planting hole and disinfect the transplanted base. 2 Technical Measures for Transplanting Large Trees 2.1 raised seedlings Before raising the seedlings, full-crown tree trunks with straight trunks, smooth bark, and graceful tree posture should be selected, and the main branches, some lateral branches, dead branches, diseased branches, weak branches of honey, and some small branches should be drawn or prune. In the lifting process, the roots should be as smooth as possible with a saw and sprayed with a water-repellent transpiration agent. If the trunk is cut dry, it should be wrapped in a plastic bag to prevent loss of water. 2.2 Evergreen species or deciduous species with diameter greater than 15cm must be transplanted with soil ball. If the whole crown is not transplanted, the size of the soil ball should be determined according to the DBH of the tree. For example, if the DBH diameter is 8-15cm, the soil ball should be 6â†80cm, the DBH should be 15-20cm, and the soil ball should be 80-100cm. Generally, it should be more than 20cm. With soil ball more than 100cm, if with full crown, soil beads should be based on the diameter of the diameter of the tree diameter, the length of lifting time, transport distance and other appropriate increase in soil ball and hoisting with a crane. 2.3 Packaging Deciduous tree diameter less than 15cm can be transplanted bare root, but the roots must be mud stained, and use j-straw bandaging to avoid and reduce the root fold and squeeze bumps. Within 80cm of the earth ball, it is generally solidly wound with a thick straw rope. The earth ball is more than 100cm in length, and the wooden box is fixed on all sides with wood or iron bars. 2.4 Planting Before the planting, the straw is rolled into a straw rope shape (the straw rope is as thick as possible) to wind the trunk, which is beneficial for the trees to breathe and absorb certain moisture, and the insulation performance is good. The grass rope is wrapped around the top of the trunk and exposed to 5-lOcm. The rest of the area is sealed with plastic sheeting. Anytime there is damage, it is immediately closed. When planting, the root system should be further trimmed, and the root should be sprayed with a bactericide to prevent root rot, and rooting agents such as rooting powder or indole butyrate should be used to promote rooting. Even if it depends on the self-nutrition of the big tree itself, the leaf of the upper part of the plant will slowly wither and fall off from top to bottom until it dies. Then, the layers are filled and compacted layer-by-layer, pouring enough water. 2.5 shade Before the end of June, a shade net shall be constructed. The shade net can prevent the trunk from being dehydrated, the bark cracking or the leaves from being burned in the summer due to overheating jE and direct sunlight. In addition, conditional spray irrigation can be installed, and there are plans to perform watering management on the transplanted seedlings to supplement water and increase air humidity, which is conducive to tree growth. 2.6 Fertilization During the period of germination and leaf pumping, during this period, each big tree can be poured with 0.2% of an O.5% potassium dihydrogen phosphate and urea for 1-2 times, and the amount per plant is 0.1 to 0.2 kg to facilitate the promotion of new roots. Grow. 2.7 fight drugs Because of the sawing, cutting, cutting, and the tender leaves of the trees, the trees are weak and vulnerable to pests and diseases. If you do not pay attention to precautions, trees can easily die. Therefore, prevention and control should be carried out on a regular basis, with thiophanate-methyl, omethoate or pyrethrum intended to be sprayed to control pests and diseases. 2.8 wipe bud, trim After sprouting one month at the top, all buds below 2 leaves are wiped to increase the absorption of moisture and nutrients at the top. At the same time, pruning should be carried out. Taking the trunk as the center, four north-south and north-west hits are divided into three directions for the division of 120 degrees, and 3 to 6 branches are reserved, which is conducive to tree cultivation. 2.9 hanging needles Ten months after the tree trunks sprouted, some big tree trees had to be increased in nutrients and hormones due to the large damage in the early stages and the weaker germination power in the later stages, which was difficult to heal on their own callus. Hand Ding is to put the trunk of a big tree as a nursery, divided into two equal parts, and hang → hanging bottle about 2m from the ground. The bottle contains hormone and tissue culture nutrient solution, and the 120-degree angle position hangs hanging → catheter. At a location of about 50cm, use a small nail to knock a small hole in the layer of big tree and insert the needle of the catheter into the small hole. The flow rate of the droplet is good every week. Usually, the bottle is hung for about 10 days, and it can be changed after hanging. Amino acid-based nutrient solution to two courses. 2.10 irrigation and foliar spray Open drainage ditch after cutting. To prevent rainy season product 7.K rot. If there is no sprinkler setting, dry weather should be irrigated, according to soil moisture, summer-like 10 15 days irrigation once. Conditions should be equipped with sprinkler irrigation equipment, equipment, the main material of PVC camp, PE hose, nozzles, filters, pumps, gate valves, plugs, wire and so on. In short, after years of experimentation, the author only needs to do the above major technical measures when transplanting trees, and the survival rate should reach 95%. The preservation rate should reach 90% or more.
Obstetric Delivery Table is suitable for gynecological diagnosis and examination, child-birth, caesarean operation and other gynecological surgical operations. Its height adjustment, back section and sitting section adjustment are precisely and smoothly controlled by pus rod. The low voltage system ensures user`s safety. The table has an aesthetically beautiful bodyline and the bed mattress is soft and made of leatheroid, which makes them easy to be taken off, cleaned and sterilized.
Obstetric Delivery Table Obstetric Delivery Table,Gynecology Delivery Table,Delivery Table,Operating Table For Delivery Shandong Lewin Medical Equipment Co., Ltd. , https://www.operatinglight.nl
