Measures for preventing premature senescence of tomato growing in greenhouse
Greenhouse tomatoes are prone to premature senescence if they are not properly managed in the middle and late stages of growth, showing the dry edges and roll-up of the lower leaves, yellow-green flowers and leaves in the middle and upper leaves, cracking and deformed fruits, which seriously affect the yield of tomatoes. To prevent the premature aging of tomatoes in greenhouses and increase the yield in the middle and late stages, the following measures can be taken. One is to control the temperature. Especially at noon if the temperature exceeds 33 ° C for too long, the plants are prone to distortion of growth points and the middle and lower leaves curl. Special attention should be paid to the temperature during the fruit expansion or fruiting period, and the temperature should be strictly controlled and shaded appropriately. The second is to water evenly. High temperature and drought will cause premature senescence of tomatoes. Therefore, under high temperature conditions, it is necessary to increase the number of waterings and reduce the amount of watering (gutter or border watering) to ensure the demand for water during the fruit expansion period. The third is to supplement nutrients in a timely manner. Nutrient supplementation is not easy to produce cracked fruit and deformed fruit in time. When the temperature is high and the number of watering times is increased, the ternary compound fertilizer should be properly applied and a certain amount of trace elements should be appropriately applied. Disclaimer: Some articles of this website are transferred from the Internet. If the legal rights of third parties are involved, please inform this website for processing. phone
There are mainly the following parts:
1. Sampling swab with disposable sterile plastic rod/rayon head
2. Sterile sampling tube containing 3ml of virus maintenance solution (gentamicin and amphotericin B are selected to better inhibit the fungus in the sample. Avoid the human sensitization reaction that may be caused by penicillin in the traditional sampling solution.)
In addition, there are additional parts such as a tongue depressor, a biosafety bag, etc.
Intended to use
1. It is used for monitoring and sampling of infectious pathogenic microorganisms by disease control departments and clinical departments.
It is suitable for sampling of influenza virus (common influenza, highly pathogenic avian influenza, H1N1 influenza virus, etc.), hand, foot and mouth virus and other types of viruses. It is also used for sampling of Mycoplasma, Chlamydia, Ureaplasma, etc.
2. It is used to transport nasopharyngeal swab samples or tissue samples from specific parts from the sampling site to the testing laboratory for PCR extraction and testing.
3. It is used to preserve nasopharyngeal swab samples or tissue samples from specific parts for necessary cell culture.
The virus sampling tubes are loaded with infectious substances, and some are even highly pathogenic substances. Therefore, the requirements for packaging containers are very strict, and three requirements must be met at the same time:
1. The safety of transportation.
Ensure that the sample does not leak during transportation. Sampling tubes that comply with WHO regulations and biosafety regulations.
2. The security of preservation.
Ensure that the sample does not leak during storage. Sampling tubes that comply with WHO regulations and biosafety regulations.
3. The validity of the sample.
Make sure that the sampling tube itself will not have a toxic effect on the sample.
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