Plug seedling precautions

A vegetable farmer from Shengcheng City, Shouguang, recently asked: "My self-cultivated seedlings have been growing for over 20 days, and now the leaves are turning yellow. What should I do?" After analyzing the situation, it was found that the main issue is overwatering. The seedlings are staying too wet, which can lead to root problems and nutrient absorption issues. Additionally, the substrate used might not be well-draining, causing poor aeration and further contributing to yellowing. Another possible cause is excessive fertilization, especially an overuse of nitrogen, which can burn the roots and result in yellow leaves. To address this, the farmer can try using a foliar fertilizer containing iron and zinc. Mixing it at a ratio of 1:800 and spraying it on the leaves a few times can help improve the condition without damaging the roots. It's also important to adjust the watering schedule—allow the soil to dry slightly between waterings. Checking the drainage of the planting medium and ensuring proper ventilation can also prevent future issues. In addition, it's a good idea to monitor the temperature and light exposure, as these factors can also affect seedling health. If the problem persists, testing the soil pH and nutrient levels may provide more insight into what’s going wrong. With some adjustments, the seedlings should start to recover and grow stronger.

Vtm Sampling Tube With Swab

[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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