It is better to choose the sandy loam with high dry terrain, deep soil layer, loose and fertile, and good drainage. After the previous season's crops are harvested, the soil should be plowed more than 30 cm deep, and after a few days of exposure, plow and plow again. Combined with land preparation, 2500 kilograms of compost per mu is applied and turned into the soil as base fertilizer. Then, the flattening rake is finely made into a high border, and the border surface is connected into a turtle-back shape, and the top soil layer is required to be loose and finely broken.
Sowing at the right time and sowing too early, Angelica dahurica has grown too vigorously that year, and most of the plants bolted and bloomed in the second year, which made the roots hollow and rotted and could not be used for medicinal purposes; too late, the seedlings unearthed and are vulnerable to freezing damage. Timely sowing is the key to high yield of Angelica dahurica. Angelica dahurica is propagated by seed, which can be drilled, drilled, or broadcasted.
Thinning weeding Angelica Angelica seedlings grow slowly. The seedlings are generally not thinned in the first year of sowing. After the early spring returns the next year, the seedlings are thinned when the seedlings are about 6 cm high, and thin and thin seedlings are thinned. The spacing between the plants is 13 to 15 cm, with 3 plants in each hole, staggered in a triangle shape to facilitate ventilation and light transmission. When setting the seedlings, the large seedlings that have grown too vigorously and the petioles are blue and white should be pulled out to prevent early bolting and flowering. Combine thinning and fixed seedlings to carry out intertillage and weeding at the same time. Weeding at the seedling stage should be done by hand or shallow hoe.
Scientific top dressing Scientific fertilization is the key to improving the yield and quality of Angelica dahurica. Too much fertilization and excessive growth can easily cause bolting and flowering and reduce yield; insufficient fertilization and poor growth. In general, apply less or no application before spring to prevent excessive growth in the seedling period and bolting and flowering in advance. After spring, the vegetative growth begins to be vigorous, and top dressing can be applied 3 to 4 times. The types of fertilizers can be human waste, decomposed cake fertilizer, ring fertilizer, urea, etc. Phosphorus and potassium fertilizers can be applied once before closing the ridges to promote thick roots.
The number of top dressing and the amount of fertilizer applied each time can be determined according to the growth of the plant. If the color of the leaves of the plant is light green when the ridge is about to be closed, it can be topdressed again, or the leaves are dark green at this time and the growth is vigorous. Up.
After the soil is dry after sowing, it should be irrigated in time to keep the soil moist to facilitate the emergence of seedlings. During the growth period, if the weather is dry, water should be timely to ensure the plant growth needs; when there is too much rain or water in the field, drainage should be timely to remove waterlogging to prevent disease or root rot.
Diseases and pests prevention and control of Angelica dahurica diseases occur rarely, and sometimes gray spot disease and spot blight occur. In order to reduce the source of diseases, organic fertilizers should be added to improve soil and enhance disease resistance. Spot blight can be sprayed with 1:1:100 Bordeaux mixture or with 65% dysenzine wettable powder 400-500 times. The insect pests of Angelica dahurica are mainly in the seedling and flowering stage. Aphids, heartworms and yellow swallowtails commonly eat up leaves or flowers, which affect plant development and fruit maturity. Heartworms bite the seeds, and in severe cases can cause seed failure. The larvae can be killed manually or sprayed with 90% trichlorfon 800 times solution.
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and are supplied sterile.
airways are single use, latex free and are supplied sterile.
Most endotracheal tubes today are made of polyvinyl chloride, but special tubes made of silicone rubber, latex rubber, or stainless steel are also widely used. Most tubes have an inflatable cuff that seals the trachea and bronchial tree to prevent air leaks and inhalation of stomach contents, blood, secretions and other fluids. Catheters without a capsule may also be used, but their use is mainly limited to pediatric patients (in young children, the cricoid cartilage is the narrowest part of the pediatric airway and usually provides an adequate seal for mechanical ventilation).
Types of endotracheal intubation include oral or nasal, with or without a capsule, prefabricated (e.g., RAE (Ring, Adair, and Elwyn) tubes), reinforced tubes, and double-lumen endobronchial tubes. For human use, tube ID sizes range from 2 to 10.5 mm. Sizes are chosen based on the patient's body size, with smaller sizes used for pediatric and neonatal patients. Tubes larger than 6 mm in diameter usually have inflatable cuff. Originally made of red rubber, most modern tubes are made of polyvinyl chloride. Those placed in the laser field could be flexible metals. Robertshaw (and others) developed a double-lumen endobronchial catheter for thoracic surgery. These allow ventilation from one lung while the other collapses, making surgery easier. After the surgery, the deflated lung is re-inflated to examine the fistula (tears). Another type of endotracheal tube has a small second luminal opening above the inflatable cuff that can be used for aspiration in the nasopharyngeal area and above the cuff to aid in extubation (removal). This allows the aspiration of secretions located above the cuff, which helps reduce the risk of chest infection in patients with prolonged intubation.
Disposable Endotracheal Tube
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