The demand for nutrients in bananas generally increases as the leaf stage increases. The growth and development of banana 18-40 leaves is decisive for the yield and quality of bananas, so this period is an important fertilization period for bananas. This period can be divided into two periods of heavy application in the middle and late stages of vegetative growth and flower bud differentiation. Most of the fertilizer should be concentrated in these two periods.
In the middle and late stages of vegetative growth (18-29 leaf stage), 3-5 months after planting of spring planting bananas, 5-9 months after planting of summer and autumn bananas and Sugan bananas. From the leaf shape, this period is just from the middle of the leaf (the new leaves just pulled out at this time are mostly curved like a tiger tail) to enter the large leaf 1-2 pieces. This period is in the vegetative growth period, the nutrient requirements are very strong, the reaction is the most sensitive, the growth and development of the banana plant is good or bad, determined by the abundant supply of fertilizer. If the heavy fertilizer is applied at this time, the banana plant can get sufficient nutrients. The long and thick leaves of the banana plant with high stems and high-efficiency assimilation, accumulate a large amount of organic matter, and lay a good foundation for the next stage of flower bud differentiation.
Flower bud differentiation period (30-40 leaf stage), that is, 5-7 months after planting of spring planting bananas, after summer and autumn planting of bananas and after planting of bamboo shoots for 9-11 months, from the leaf shape, this period is drawn by From 1-2 slices to short-circle sunflower leaves, the leaf distance is transferred from the most sparsely, and the leaf-leaving speed is slower; from the stem, the pseudo-stem develops to the thickest, and the bulb begins to expose the ground, showing a cast shape; From the point of sucking buds, it has entered the period of sucking buds. This period is in the process of flower bud differentiation of reproductive growth, which requires a large amount of nutrients for the growth and development of young ears, in order to form the ear with large spikes. According to foreign studies, when the vegetative growth stage enters flower bud differentiation, the nitrogen content of the leaves suddenly drops, because a large amount of nitrogen is urgently needed for flower bud differentiation. When the roots absorb nitrogen from the soil, the nitrogen has to be met. Transfer from tissues and organs such as leaves and stems. At this time, heavy fertilizer can promote the maximum assimilation of the leaves and produce more organic matter for the formation and growth of young ears.
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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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