Among fruit vegetables, tomatoes are one of the most fertile crops. In addition to absorbing a large amount of water from the soil, the whole growth period must also absorb nitrogen, phosphorus, potassium, calcium and other elements and boron and manganese from the soil. Zinc. Trace elements such as molybdenum. Nitrogen can promote the growth of leaves and leaves of tomatoes. Generally produce 1,000 kilograms of tomatoes, need to absorb 3.5 kilograms of ammonia from the soil, when the soil is deficient in nitrogen, the plants are short, the leaves are yellow, the fruit is small, the pods are less or not result; when the nitrogen fertilizer is too much, the plants are long and they are prosperous. It is easy to cause a large number of falling flowers, stagnant fruit development, and reduced sugar content. Whether it is nitrogen deficiency or excessive nitrogen fertilizer, it will eventually lead to a significant reduction in tomato production and severe deterioration in quality. Tomatoes also need large quantities of potassium fertilizer. In general, 3.8 kg of potassium need to be absorbed from the soil for every 1000 kg of tomatoes produced. On the basis of a certain amount of nitrogen fertilizer, if 10 kg of potassium fertilizer is added per acre, the yield per unit area of ​​tomatoes can be increased by two or three times, and the effect of increasing yield is very significant. In some areas of our country, there is no habit of adding potassium fertilizer, or improper methods of applying potash fertilizer (such as mixing plant ash with human urine). Therefore, the yield of tomatoes is often kept at the original level. Potash can not only increase the yield of tomatoes, but also improve the quality of the fruit, increase the sugar content and reduce the acidity. The absorption of phosphate fertilizers by tomatoes is not as good as that of nitrogen and potassium (usually 1 000 kg of tomatoes need to absorb 1 kg of phosphorus from the soil. ), but it does not mean that phosphate fertilizer is not important for the growth and development of tomatoes. On the contrary, phosphate fertilizer is very important for promoting flower bud differentiation and early flowering of tomatoes, as well as promoting seedling root growth and improving fruit quality. Phosphate fertilizers are applied in some areas, but the effect of fertilizers is not obvious. The reason is often due to phosphate fertilizers. The method of application is inappropriate. For example, calcareous soil (a soil containing more calcium carbonate) can only use superphosphate, but the application of phosphate rock powder, calcium magnesium phosphate fertilizer has no effect. In addition, if calcium superphosphate is directly applied to the soil, it will also cause effective phosphorus to be fixed by the calcium ions in the soil solution and form phosphorus compounds that are ineffective and can not be directly absorbed by plants. In order to reduce the direct contact between superphosphate and soil, it is better to mix calcium superphosphate and decomposed organic fertilizer in advance so that the surface of superphosphate is covered with organic fertilizer to reduce the fixation effect of soil on organic phosphorus, and to increase phosphate fertilizer. The effect of application, tomato plants in addition to the need to absorb large amounts of nitrogen, phosphorus, potassium from the soil, but also need to absorb a certain amount of calcium. Tests have shown that calcium can increase the crack resistance of tomato fruits and prevent the occurrence of fruit umbilical rot.
Endotracheal tube kit is consist of endotracheal tube, suction catheter, laryngoscope blades, suction connecting tube, Intubation Stylet, endotracheal tube holder, gauze swab, latex gloves, lubricant, syringe, oral pharyngeal airway, tooth cushion and so on, also can be customized.
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