Answer: It is necessary to seize the favorable time between the fruit picking and before freezing, and timely fertilize the pear trees, which is conducive to the timely supplement of nutrients in the tree body, the enrichment of flower buds, and the quick recovery of the injured root system. The amount of topdressing in this period should account for 60% to 70% of the annual fertilization amount. The fertilization should be mainly organic fertilizer to increase the soil organic matter content, improve the soil aggregate structure, and enhance the permeability of the soil. Use the red triangle three-element compound fertilizer and middle and trace elements such as calcium, boron and zinc. Organic fertilizer mainly refers to soil and miscellaneous fertilizers such as human and livestock manure, pig, mutton and chicken manure, and artificially retorted straw. The method of fertilization is mostly by digging radial trenches. Generally, the trench width is 30-40 cm and the trench depth is 30-40 cm. The length of the trench should exceed the projected area of ​​the tree. Water in time after fertilization to facilitate the nutrient absorption of the tree and the restoration of the root system. Frozen water can also enhance the frost resistance of pear trees.
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The mini locking system can be used for the fixation of ossicles and small bone fragments, osteotomy, arthrodesis, and replantation and reconstruction of ossicles and small bone fragments.
It is composed of micro locking plate 1.5mm/2.0mm/2.4mm/2.7mm series, covering a variety of plate types and a wide range of indications. The plates are all anatomical design, which reduces the need for shaping and helps to reduce the workload of surgeons. Low profile and countersunk screw design can reduce soft tissue injury. Matching orthopedic screws self-tapping design, convenient implantation, screw plum design, reduce screw hexagonal sliding teeth. The composite hole design can not only realize the compression of the fracture end, but also can be used as a locking internal orthopedic fixation frame. Part of the reconstruction structure is convenient for the surgeon to tailor the implant according to the actual situation in the reoperation, and increase the flexibility of the operation. Its indications are mainly phalanx, metacarpal, scaphoid and other carpal bones, ulnar styloid process and capitulum, radial head and styloid process fracture fixation. The 1.5mm orthopedic implants titanium system is mainly used for the middle and proximal phalanx, the 2.0mm orthopedic plates system for the metacarpal bones, the 2.4mm implant locking plate system for the first metacarpal bones and carpal bones, and the 2.7mm mini plate system is mainly used for the distal ulna and radius. According to the clinical research, the micro-locking plate internal fixation in the treatment of multiple comminuted metacarpal fractures can effectively achieve the anatomical reduction and healing required by the clinic. The patients have good postoperative healing, and the functional recovery of the affected limb is good during the postoperative follow-up. It has good clinical effect and can be further promoted and applied.
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