In winter, greenhouse vegetables are easy to be frozen, which will cause freezing damage, which will hinder the growth of greenhouse vegetables and affect yield and quality. So, how do you ensure the normal growth of vegetables in winter? A few days ago, the reporter interviewed Zhang Enhui, an associate researcher at the College of Horticulture, Northwest A&F University, on anti-freezing of greenhouse vegetables in winter.
Strengthen the coverage in the big shed to buckle the small arch shed, use thin bamboo poles as the arch frame, cover the film at night, cover the grass thatch on the film, and cover the shed with mulch, which can increase the temperature and moisture; the bottom of the shed is made of plastic film as apron, which can be obvious Reduce the invasion of cold air at the bottom. At the same time, pay attention to blocking the gaps in the shed to minimize heat dissipation in the gaps.
Temporary heating When the temperature in the greenhouse during the day is lower than 15°C and the temperature at night is lower than 5°C, chilling or freezing damage may occur. Temporary heating measures should be taken at night to supplement heat energy manually, that is, several briquettes can be placed in the shed to increase the temperature in the shed.
Strengthen fertilizer and water management Before and during low-temperature freezing damage, crops should stop applying nitrogen fertilizer to prevent the plants from being too soft and cold-resistant and damaging the seedlings. You can spray 0.3%-0.5% potassium dihydrogen phosphate and 400-500 times the plant antifreeze It can also be used to pour dilute manure water in the shed to prevent the soil from freezing and achieve the purpose of protecting seedlings and preventing cold.
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Diagnostic reagents can be divided into two categories: in vivo diagnostic reagents and in vitro diagnostic reagents. It is mostly a reagent for detection by the reaction between antigen and antibody.
A: Classification of in vitro diagnostic reagents:
1. In vitro biodiagnostic reagents managed as drugs include:
1. Blood type and tissue type reagents;
2. Microbial antigen, antibody and nucleic acid detection reagents;
3. Tumor marker reagents;
4. Immunohistochemistry and human tissue cell reagents;
5. Human genetic testing reagents;
6. Biochips;
7. Allergy diagnostic reagents.
2. In vitro reagents managed as medical devices include:
1. Clinical basic test reagents;
2. Clinical chemistry reagents;
3. Blood gas and electrolyte determination reagents;
4. Vitamin determination reagents;
5. Cell histochemical stains;
6. Autoimmune diagnostic reagents;
7. Microbiological test reagents.
B: According to medical test items, clinical diagnostic reagents can be roughly divided into clinical chemical test reagents, immunology and
Serological testing reagents, hematological and cytogenetic testing reagents, microbiological testing reagents, body fluid excretion
Detection reagents, genetic diagnosis reagents, etc. Among them, the market share of clinical chemistry
The largest, close to 34%; followed by the immunology market, accounting for about 29%. Novel immunodiagnostic reagents and genetic diagnostic tests
The reagent was developed in the late 1980s, and it is the most common diagnostic reagent for all current diagnostic reagents, regardless of technology or market.
The fastest growing product.
Urine Rapid Test Kit,Rapid Test Kit 6-Panel,Toxoplasma rapid test kits,Fecal Occult Blood Test
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