Wheat winter irrigation timely early spring antifreeze and drought
The timely winter irrigation of wheat is an important measure to keep the seedlings safely in winter and prevent frost and drought in early spring. The role of winter irrigation Winter wheat has many functions in winter irrigation, which can ease the dramatic changes in the ground temperature, prevent freezing and dead seedlings, ensure safe winter wheat seedlings; Cold wind blowing roots; can eliminate overwintering pests. In short, winter irrigation has a significant increase in production, generally increasing production by 10%-20%. In addition to rainy years, soil moisture is higher and late seeding weak seedlings, generally should be timely winter irrigation. In winter irrigation technology, the first winter irrigation must be timely, the irrigation is too early, the temperature is high, and the evaporation is large. If there is too much loss in winter, it will not achieve the effect of winter irrigation. The winter irrigation is too late, the temperature is too low, the ground has been frozen, and the water is not easy to infiltrate. , The area of ​​land is water-frozen, and the wheat seedlings are prone to drowning under the ice for a long time, or form ice icicles, lift the clods, break the wheat roots, and hang the wheat seedlings. The period of timely winter irrigation in the area is generally averaged after the “winter seasonâ€. The temperature starts at 7°C-8°C, and the high tide starts at 3°C-5°C. It ends before freezing. The specific implementation depends on the flexible grasp of climate change and soil conditions. The people’s experience is that “there is not freezing, winter irrigation is too early, only freezing is not possible, and winter irrigation is late; nights are frozen and depleted, winter irrigation is just right.†Low-lying land and clay land need to be advanced. Pouring to prevent the return of pulp in spring is serious, affecting the growth of wheat seedlings, rapid loss of land sand, watering to be close to freezing, to prevent drought in winter dead seedlings. The amount of irrigation water in winter should not be too large. It is advisable to seep through the water on the same day of the same day. Do not flood the area with water. The ground area is water and ice is formed. After pouring, loosen the soil immediately to prevent the ground from cracking, and the roots will be damaged by the wind, causing dead seedlings. Second, should be clear under what circumstances can not winter irrigation; First, before the winter rain, soil moisture content, generally more than 16%, more than 18% of loam, clay more than 20%, you can not winter irrigation. For the land that can be filled without irrigation, we must insist on winter irrigation. To prevent accidents and cause death. At the same time, water can be adjusted after irrigation to reduce the pressure of spring irrigation. Second, for late buckwheat, winter water should not be irrigated at the end of the planting season. However, we must pay close attention to the protection of wheat and wheat fields, and raise the temperature of the earth. We must “live†the winter. Again, regarding the combination of winter fertigation and fertilization, the top dressing is actually applied in winter. For the second and third types of wheat fields where the population is small and the number of mussels is less than 50,000 to 600, fertilizers can be top-dressed and combined with winter irrigation to top-dress fertilizers, which is better than returning to green. Because, turning green water can easily reduce the temperature, affecting the growth of wheat. The topdressing amount is 8-10 kg urea or 20-25 kg ammonium bicarbonate. For the seedlings with sufficient base fertilizer, strong seedlings and enough seedlings, the group of six or more than 700,000 seedlings are generally not top-dressed, so as to avoid excessive delivery in the spring and the group is too large, resulting in passive management in the later period. Viral Transportation Medium Tube
Uses: used for the detection and sampling of influenza, hand, mouth, foot and other epidemic diseases
For sample collection, transportation and storage. Viral Transportation Medium Tube,Sample Collection Tubes,Transport Nasal Swab With Tube,Virus Sampling Tube Nasopharyngeal Swab Jilin Sinoscience Technology Co. LTD , https://www.jlgkscience.com
Inspection principle:
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As a protein stabilizer, bovine serum albumin can increase the survival time and infection stability of the virus;
Buffers such as Hank's build a neutral environment, which helps to increase the survival time and infection stability of the virus;
Phenol red is an acid-base indicator, the discoloration area is 6.6 (yellow)~8.0 (red), and it is red at 7.2~7.4.
Steps:
1. According to the sampling requirements, use a sampling swab to collect samples.
2. Place the swab after collecting the sample into a sterile sampling tube.
3. Break the sampling swab rod that is higher than the sterile sampling tube.
4. Tighten the cap of the sterile sampling tube.
5. Label the sterile sampling tube with information as required.
Product advantages:
1. The virus discretion of the flocking swab is high to ensure the accuracy of the test results.
2. The samples are well sealed to ensure product transportation and safe storage.
3. Product instruction manual, product certificate
Product Details:
1. The product set includes a one-time Virus Sampling Tube (including preservation solution), a self-sealing bag, a sampling swab, and instructions.
2. Product specification: 100 sets/box, 8 boxes/box 3. Product weight: 0. 65kg/box, 13. 2kg/box
4. Packing size: 25. 5*23. 5*14. 5 boxes, 53*49*32/carton
Scope of application:
Work resumption testing, the best choice for large-scale population screening
Features:
1. Transport at room temperature, stably preserve viral RNA
2. Pre-packaged guanidine salt lysate can inactivate the new coronavirus, ensuring the safety of transportation and testing personnel 3. The large-capacity preservation solution can fully soak the swab head,
The sample size can be divided into three parts for testing and reserve samples respectively to meet the testing needs.
Scope of application:
Suspected cases, disease control testing, preferred by P3 laboratory