Suggestions for the shed after cooling down and snowfall

Snow is easy to cause harm to the production of facility vegetables. It is recommended that you take corresponding measures to deal with snow and cooling weather.

1. Clear snow and strengthen the shed

In case of snowfall, the quilt should be opened as soon as possible for the vegetables in the shed; the snow on the shed film should be cleaned in time to prevent the heavy load of the shed and the damage of the shelving and crushing of the shed film. When it snows, the old shed can be temporarily reinforced with bamboo, wood, and iron (steel) rods to enhance the load-bearing capacity of the scaffold. After snow, repair damaged facilities in time and remove waste membranes and supports.

2. Adjust temperature to prevent freezing damage

The pepper, eggplant, tomato, etc. in the shed are most vulnerable to snow damage and freezing damage during snow melting. Once freezing damage occurs, the light output will be reduced by 10%-20%, and the heavy output will be reduced by more than 50% or no harvest.

1. When it is continuously cloudy, under the premise of ensuring the temperature of the shed, the grass thatch should be normally uncovered, and the dust, dirt and snow on the shed film should be removed with warm water to increase the sunshine in the shed and increase the temperature of the shed. As long as the temperature of the shed does not drop sharply after uncovering, it is necessary to uncover the grass and see the light every day to strive for precious scattered light. The time should be one hour later than the sunny day.

2. When it snows, the grass thatch should be covered, and a thin layer of thatch or shed film should be added to the original quilt or grass thatch, which can not only block the wind, but also prevent rain and snow from getting wet and freezing the grass thatch, and also reduce Heat loss caused by evaporation of water. Add grass thatch curtains or corn stalks in front of the big shed, close the door of the buffer room tightly, tightly seal and seal the front fence of the shed to prevent cold wind from entering and causing harm.

3. For the freshly planted melon and other seedling vegetables, put two membranes in the big shed or set up a small arch shed and cover with grass curtains, so that the temperature can be increased by 1℃-2℃.

4. Conditional parks can use heaters, air conditioners, radiators and other heating equipment to increase temperature, and add stoves or electric heaters, electric stoves, combustion blocks, etc. in the greenhouse to increase temperature and protect seedlings.

5. Use a plant growth lamp with sufficient power to supplement the light. Under sufficient light, photosynthesis is good, the plants are strong, and the cold resistance against low temperatures can be improved, and the shed temperature can be increased by about 2.5 ℃.

3. Water and fertilizer management to improve stress resistance

1. During snowfall, if it is not a severe drought, do not water the vegetables to avoid lowering the ground temperature. If the plants are short of water, you should choose the fine weather just after the cold current, and use drip irrigation under mulch or small water under mulch. Strict control of watering in cold weather, cultivating cold prevention. Use shallow tillage to break wet soil to control water transpiration, increase ground temperature, and promote root absorption capacity.

2. The photosynthesis capacity of leaves is reduced in snowy days, so you can properly spray foliar fertilizer to supplement nutrients. It is recommended to use bio-amino acid or bio-potash fertilizer and humic acid to supplement nutrition.

3. Spray biostimulants on the leaves to improve the cold resistance of plants. It can be sprayed with foliar fertilizer and added with alginic acid, such as 20 ml of Amez, 15 ml of Asobo with 15 liters of water, or 20 ml of Amez, 10 ml of Tubokang with 15 liters of water, and it can increase The sugar content and hardness of the mesophyll alleviate the degree of freezing damage.

4. Ventilation and humidity reduction, prevention of diseases

The photosynthesis of plants is reduced in snowy days, and their resistance to adversity is reduced. At the same time, low temperature and low light increase the humidity in the shed, which is easy to induce diseases. Reasonable ventilation and humidity should be adopted to control the occurrence of diseases.

1. Because the water in the snow canopy evaporates slowly, solanaceous vegetables are prohibited from branching, flower thinning, spraying, fruit picking, etc., so as to avoid wounds that may cause infections and disease.

2. In a continuous cloudy and snowy day, the respiratory consumption of vegetables is greater than that of photosynthesis, and a large amount of harmful gases such as carbon dioxide will accumulate in the greenhouse. Therefore, when the continuous cloudy and snowy days are more than 3 days, the wind must be released for 1 hour at noon and remove the shed. moisture.

3. After the snow, when the weak vegetables are suddenly irradiated by strong light, the plants will lose water quickly, causing the leaves to wither, flower, fruit or the whole plant to die. For fruit and vegetable vegetables, when the local temperature is below 10°C, the growth and absorption of the root system basically stops. If the weather clears after snow, the temperature in the shed will rise quickly if the grass is uncovered immediately, the light will increase, and the plants will evaporate a lot of water. However, the root system cannot meet the transpiration of the leaves under the condition of extremely weak water absorption. If you do not take timely measures, it will Make the leaves form permanent withering that is difficult to recover, and eventually lead to plant death. In order to prevent this from happening, be careful not to fill up the thatch when uncovering the grass. It is necessary to "return the curtain" to prevent the occurrence of physiological wilting after a long period of low temperature and low light.

4. Vegetable gray mold, sclerotinia sclerotiorum, late blight, etc. are easy to occur under low temperature and high humidity. When controlling these diseases, aerosols such as chlorothalonil and sukeling should be used, which is beneficial to uniform application , And will not increase the indoor air humidity.

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