Chinese cabbage is a leafy vegetable with a large number of leaves and a heart-shaped leaf. It is the main harvesting organ. Generally, it can reach 4000-5000 kg per mu. Chinese cabbage has a long growth period. To get a high yield, you must master several key technologies:
1. Applying the base fertilizer: The base fertilizer is the basis for the harvest of Chinese cabbage. Generally, the soil fertility of old vegetable fields is high, and organic fertilizer can be applied in moderation. The nutrient ratio of compound fertilizer is mainly nitrogen and potassium, and combined with phosphate fertilizer. The new vegetable land should be re-applied with organic fertilizer and applied with ternary compound fertilizer.
2. Rose seedlings: In the seedling stage, water control nitrogen fertilizer should be controlled. In addition to the introduction of seedling fertilizer, it is generally necessary to seedling the seedlings during the rosette period, so that the outer leaves of the shoots grow robustly, promote the roots under the tie, and lay the foundation for the rapid growth and the absorption of nutrients and water in a large amount.
3. Topdressing: The first topdressing should be mastered in conjunction with irrigation during the late period of the rosette. The topdressing fertilizer is mainly based on the quick-acting nitrogen fertilizer, and the water-fertilizer enters the enveloping period. The 2-3th top dressing is carried out in the early and middle stages of the package. Mainly apply nitrogen fertilizer, up to two times, to control the dosage. After the core of the package, the nitrogen fertilizer was stopped. The amount of nitrogen fertilizer per top dressing should be determined by the growth of Chinese cabbage.
Foliar spray fertilizer: In the high-yield fertilization of Chinese cabbage, in addition to the large amount of nitrogen, phosphorus and potassium, the application of medium and trace elements should also be considered. From the current problems in the production of Chinese cabbage, some areas are mainly the physiological deficiency of calcium and boron. You can choose to spray foliar fertilizer containing calcium, boron and iron.
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[Sample requirements]
The collected nasopharyngeal swab samples should be transported at 2°C to 8°C and sent for inspection immediately, and the sample delivery and storage time should not exceed 48 hours.
[Testing method]
1. Before sampling, mark the relevant sample information on the label of the sampling tube.
2. According to different sampling requirements, use a sampling swab to sample in the nasopharynx.
3. The specific sampling methods are as follows:
a) Nasal swab: Gently insert the swab head into the nasal palate, stay for a while and then slowly turn to exit. Wipe the other nostril with another swab, immerse the swab head in the sampling solution, and discard the tail.
b) Pharyngeal swab: Wipe bilateral pharyngeal tonsils and posterior pharyngeal wall with a swab, also immerse the swab head in the sampling solution, and discard the tail.
4. Quickly put the swab into the sampling tube.
5. Break the part of the sampling swab higher than the sampling tube, and tighten the tube cover.
6. Freshly collected clinical specimens should be transported to the laboratory within 48 hours at 2°C to 8°C.
[Explanation of test results]
After the sample is collected, the sampling solution turns slightly yellow, which will not affect the nucleic acid test result.
[Limitations of the test method]
1. For samples that are seriously contaminated due to improper storage after collection, the final test results will be affected.
2. If the sample is not stored at the specified temperature, the final test result will be affected.
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