In summer, the temperature rises continuously, and the rainy weather increases. In this high temperature and high humidity environment, vegetables are prone to premature aging symptoms, which are characterized by plant atrophy, slow growth, yellow leaves, etc., which seriously affect the yield of vegetable cultivation. And quality, it is necessary to take timely and effective prevention measures. How to deal with the premature aging of vegetables in summer? Hui Nong.com compiled the six main points for prevention and treatment of premature aging of vegetables for reference. First, clear the ditch, reduce the water level It is rainy in summer, and it is necessary to clean up the furrows in the field to eliminate waterlogging, improve the rhizosphere living environment of vegetables, reduce pests and diseases, and avoid the occurrence of roots. Second, scientific use of fertilizer to ensure the need Fruit and vegetable vegetables need more fertilizer and faster fertilizer consumption, so it is necessary to apply sufficient fertilizer to ensure the supply, especially in the seedling stage, flowering stage, maturity stage and the first batch of fruit after harvesting. The combination of nitrogen, phosphorus, potassium and trace elements (boron, calcium, zinc, iron) has a good effect on plant regeneration and improving the second batch of fruit yield, as well as preventing premature aging. In the latter part, root dressing can also be carried out. Third, irrigation and cooling, fertilization promotes long In the hot season, the furrow irrigation or sprinkler irrigation should be carried out in time according to the soil condition and the growth trend of the melons, so as to reduce the soil temperature, temperature and leaf temperature, and reduce the high temperature encountered by the leaves. At the same time, it supplements water and dissolves fertilizer, which is beneficial to root absorption. On the other hand, it is timely to cultivate after the rain, to eliminate the knot, to ensure the healthy growth of melons and vegetables. Fourth, timely picking, promote early maturity After harvesting the first loquat fruit, pepper, eggplant, tomato, etc. should be removed according to the density, and the center of the heart and the side heart should be removed in time to eliminate the "top advantage" and promote the balanced growth of the plant, that is, the top and the heart can be beaten when the line is closed. When you are not closed, you will only pick the top of your heart and not be careful. Cucumbers, melons, watermelons, etc., when the melons grow to about 25 leaves, they can be topped and cut into the middle and upper branches and axillary buds, so that the nutrients are concentrated and transported to the young fruit, which promotes rapid expansion. Beans should be carefully selected according to the characteristics of the variety and the height of the bracket. For example, long vines can be topped when the vine grows to about 2 meters, while short vines and autumn beans are not topped. When picking the heart, the diseased leaves and dead leaves will be removed from the field to reduce the growth of pests and diseases. 5. Prevention of pests and diseases, robust growth Common diseases and insect pests of summer vegetables include viral diseases, anthracnose, gray mold, ulcer disease and aphids, red spiders, tobacco budworms, and cotton bollworms. It is necessary to be particularly cautious in the prevention and treatment of drugs. It is strictly forbidden to use pesticides with high toxicity and long residual period to ensure the safety of humans and animals. No matter whether it is treated or treated, it can not be sprayed 10 to 15 days before harvest. Sixth, timely harvest, mention the morning market Timely harvesting can not only produce high yields, but also increase economic benefits. Like most fruits, they can be harvested at the time of their ripening. The solanaceous and croissants are harvested at the time of their ripening. Hui Nongwang Xiaobian warmly reminds that the prevention and treatment of premature aging of vegetables is the key to ensuring the yield of vegetables and improving economic benefits. I hope that the above introduction can really help you solve the problem of premature aging in summer vegetables.
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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