Rice field fish farming is a traditional habit of Qingtian farmers. With the adjustment of the structure of farmland planting, the original double-crop rice area has gradually changed to single-season rice. In order to give full play to the traditional advantages and adjust the planting structure of farmland, from 1999 to 2001, the Qingtian Agricultural Technology Promotion Center carried out experimental research and demonstration and promotion in combination with paddy field fish breeding on the basis of the hybrid rice-rejuvenation rice cultivation methods, and summarized hybrid rice-regeneration. High-yielding farming techniques for rice and paddy fields have achieved significant economic benefits. 1 Economic Benefits From 1999 to 2001, the county's demonstration and promotion of hybrid rice-regenerating rice and rice paddy area accumulated 105 hm2, with an average of 653.25 kg per 667 m2 of rice production (including renewable rice 186.53 kg), plus paddy field fish production value of 2 061 Yuan, after deducting costs of 630 yuan and net income of 1,431 yuan, achieved significant economic benefits. 2 Main technical points 2.1 The selection of field blocks requires the selection of plain paddy fields with sufficient water sources, convenient drainage and irrigation, medium soil fertility, and strong water retention and fertility conservation and rich temperature and light resources. 2.2 Hybrid Rice - Ratooning Rice Cultivation Techniques 2.2.1 Selection of good varieties Breeding combinations with strong regeneration ability, good yield performance and strong disease resistance, such as Shanyou 63 and other hybrid combinations. 2.2.2 Good first-season hybrid rice varieties The first-crop hybrid rice is both the requirement of the first-season rice itself and the basis for the high yield of ratoon rice. Its technical points: First, timely sowing, nurturing strong. In order to ensure the high yield and high yield of first-season rice and ratoon rice, the first-crop rice is required to be sown in late March, covered with a dry-mulch mulch, and cultivated with a strong herbicide. The second is the rational close planting. Daejeon planted a density of 20 cm30 cm, inserted 11,000 to 12,000 bushes per 667 m2, and planted 38,000 seedlings. The third is scientific fertilization irrigation. The basal fertilizer should be applied with nitrogen, phosphorus and potassium on the basis of the application of bar fertilizer. Generally, 1 000 kg of fertilizer is applied per 667 m2, and 30 kg of compound fertilizer is applied. After top dressing, the topdressing of rice urea l0 kg and the growth of tillers were promoted. Due to the large amount of fish manure that can be used in the mid-term, do not top-dress. In the 15th day after the head rice was full, 10 kg of urea fertilizer was applied to cultivate strong shoots and improve regeneration. Fourth, prevention and control of pests and diseases. Efficient and low-toxicity pesticides were selected, and carbofuran, water-sulfurylphosphonates and pyrethroids that are toxic to fish were banned. In the late stage of the tillering and the booting stage, Jinggangmycin was used to control sheath blight, and bupropion was used to control rice planthoppers to ensure that the rice stalks were green and the regeneration ability was maintained. The fifth is to harvest in due course and leave it properly. When the maturity of rice is more than 95%, it can be harvested. The height of the retained rice pile is 30-35 cm. This can prevent the emergence of too early shoots to grow too slowly and the budding phenomenon too late, and at the same time achieve more axillary bud retention. The combination of paddy fields and farming, water management is very important, should be combined with fish farming, early fry to keep in the pond ditch, shallow water live trees, the deep flood season to maintain the field, increase the scope of activities of fish, provide conditions for the high yield of fish. 2.2.3 Cultivation Techniques for Ratooning Rice Science Irrigation and fertilization: To ensure the safety of fish, the first season rice should be cut with water and harvested at the beginning of the tillering season, followed by shallow irrigation at the beginning of the tillering stage and deep irrigation at the late tillering stage. This will not only benefit the growth of the fish but also facilitate the growth of the ratooning rice. Immediately after harvesting, the seedlings are topped with fertilizer, applying urea 8 to 10 kg per 667 m2, which can increase the seedlings, increase the ear, and can make fish and fish. For 2% of heading of ratoon rice, spraying “90%†2 g plus 100 g potassium dihydrogen phosphate and 50 kg of water per 667 m2 was sprayed, which promoted early and orderly emergence of ratooning rice and improved seed setting rate. Prevention of pests and diseases: Immediately after the harvest of the first season rice, spraying pesticides to control rice planthoppers, sheath blight, and aphids. 2.3 Fish farming techniques in rice fields 2.3.1 Do a good job of strengthening the field infrastructure before and after the Spring Festival. Make sure that the water inlets and fish catches are used to block the fish traps and the fish ditch and fish ponds are excavated. The size of fish ditch and fish ponds depends on the field block, which generally accounts for about 5% of the total area. It is separated from Daejeon by Oda, and Oda opens several imports and exports. 2.3.2 Shade the sun and shade on fishing trenches and fish ponds to prevent high temperatures in the summer and burn fish. In particular, after harvesting the first-season rice, it is indispensable to shelter and shelter from the heat before the rice is sealed. 2.3.3 The type of fingerlings to be put in fish is generally based on field mullet, with grass carp and tilapia. Fish fry per 667 m2: 500 tilapia, 100 grass carp, and 150 tilapia, except for tilapia seedlings, which will be put in late February; the other two will be released in the winter; at the end of May, the fry will be reared with summer fish. 1 000 tails, 300 grass carp, nurturing wintering species for the second year. 2.3.4 Field management Rice is cultivated using the ridge ridge method. Before the transplanting, the fish ditch and ridge ridge ditch are cleaned once. In the early stage of rice tillering and the seedling stage of ratoon rice, the rice seedlings were eaten by the fish, and the fish was temporarily kept in the ditch and pond. 2.3.5 Scientific Feeding According to the growth of fish, fodder and compound feed or rice bran, wheat bran, bean dregs, etc., feed, fixed, regular, quantitative, qualitative, every day from 8:00 to 9:00, 3 pm : 00 to 4:00 feeding at a fixed place twice, and often observe the fish growth dynamics, eating conditions, good or bad water quality, whether the disease, etc., to find and solve problems in a timely manner. 2.3.6 Prevention of Fish Diseases Before the stocking in the field, the fish should be disinfected. The fry can be soaked with 2% to 4% of salt water, and the majority of the fry can be floated. When the temperature of the water body is above 10°C, every 5 to 20 days, every 5 cm deep layer of water of 667 m2 is splashed with 1 kg of quick lime. 2.3.7 Early and delayed catching and catching of fry in order to get high yields as early as possible. To start raising fry in February, to collect in December, make full use of natural conditions such as temperature, light, heat and water to promote fresh fish. Production of fish and nesting of summer fish fry, for the second year, cultivation of large-scale winter fish species, so that in the second year of the first season, rice can be harvested before transplanting, harvesting, and harvesting of reclaimed rice, and part of commercial fish can be captured in stages in December to reduce the number of fields. Breeding density, high yield and high efficiency. Author: Wumin Fang Chen Lifen Zhang Qiang Kang, Agricultural Technology Promotion Center Qingtian County Source: "Zhejiang crop structure optimization and efficiency of agricultural research"
Maxillofacial Fixation
Maxillofacial fixation system -- micro-plate for cranial and maxillofacial fracture fixation, designed for the surgical treatment of maxillofacial trauma fractures, suitable for the forehead, nose, orbit, zygomatic, maxillary region, and pediatric craniofacial bones.
The system is an orthopedic surgical instrument for neurosurgical tools. The maxillofacial fixation system includes micro-plates, straight plates, L-shaped plates, T-shaped plates, Y-shaped plates, double Y-shaped plates, H-shaped plates for cranial and maxillofacial fractures. The product range is complete, covering three-dimensional titanium mesh, self-drilling rotary bone screws, anatomical orbital floor plates, orthodontic nails, etc. However, the facial anatomical structure is special, and the screw plate needs to be placed away from the fracture line and avoid important anatomical structures such as nerves and teeth roots. Therefore, the specifications of the screw plate system are required to be as diverse as possible in order to be used in different bone structures, such as different radian, length, and number of screw holes. The bone plates forcranial and maxillofacial fractures are mainly divided into 1.5mm, 2.0mm and 2.4mm systems.
Titanium (including pure titanium and titanium alloy) is the most common material for hard tissue implants. Its elastic modulus and tensile strength are higher than those of human bone, and it is better than other metal materials such as nickel-titanium alloy and cobalt-chromium alloy in terms of biocompatibility and corrosion resistance. Our maxillofacial plate is made of titanium, and the self-tapping screws are mainly made of titanium alloy.
Jaw fractures include maxillary fractures and mandibular fractures. According to whether the fracture trauma is exposed, it can be divided into open fracture and closed fracture. Trauma is the most common cause of jaw fracture, which usually includes hit, traffic injury, fall injury, firearm injury, and a few iatrogenic injuries. All are caused by external forces acting directly or indirectly on the maxillofacial region. With the popularization of motor vehicles, the proportion of jaw fractures caused by traffic accidents has increased year by year, which has become the main cause of jaw fractures. In addition, neoplastic lesions in the maxillofacial region often lead to pathological jaw fractures.
In summary, maxillofacial fixation system has been widely used in clinical maxillofacial surgery, plastic surgery and ENT, and has a relatively mature market.
Titanium Plate,Rectangular Plate,orthognathic surgery,oral and maxillofacial
Jiangsu Aomed Ortho Medical Technology Co.,Ltd , https://www.medthofixation.com