Suggestions for coping the shed after cooling down

It is easy to cause damage to the production of vegetables in the snow. It is recommended that you take corresponding measures to cope with snow and cold weather.

First, clear the snow and strengthen the shed

In the case of snowfall in the greenhouse, the quilt should be pulled open as soon as possible; the snow on the shed membrane should be cleaned in time to prevent the heavy load of the shed from damaging the shed and damaging the shed membrane due to the heavy snow and water absorption by the grass. When it snows, the old shed can be temporarily reinforced with bamboo, wood and iron (steel) sticks to enhance the load-bearing capacity of the shed. After snow, repair the damaged facilities in time and remove the waste film and brackets.

Second, regulate the temperature to prevent frost damage

Peppers, eggplants, tomatoes, etc. in the greenhouse are most vulnerable to snow damage and freezing damage during snow melting. Once the freezing damage occurs, the light output is reduced by 10% -20%, and the heavy output is reduced by more than 50% or absolutely.

1. On cloudy days, under the premise that the temperature of the shed can be guaranteed, the grasshoppers should be covered normally, 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 shed temperature. As long as the temperature of the shed does not drop sharply after being uncovered, the grass should be uncovered every day to see the precious scattered light, and the time should be one hour later than the early morning when the cover is opened on a sunny day.

2. When snowing, cover the grass moth, and add a thin layer of moth or shed film on top of the original quilt or grass moth. It can not only protect the wind, but also prevent rain and snow from getting wet and freezing. Heat loss due to evaporation of water. Add grass curtains or corn stalks in front of the greenhouse, close the buffer room door tightly, and seal tightly and the front enclosure, to prevent the danger of cold wind entering.

3. Freshly planted melon and other seedling vegetables, set two membranes or set up small arch sheds in the greenhouse and cover with straw curtains, which can increase the temperature by 1 ° C-2 ° C.

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

5. Use full-power plant growth lamps to supplement light. Under sufficient light, photosynthesis is good and the plants are robust, which can improve cold resistance against low temperatures, and at the same time increase the greenhouse temperature by about 2.5 ° C.

3. Water and fertilizer management to improve stress resistance

1. During snowfall, if it is not severely dry, do not water the vegetables to avoid lowering the ground temperature. If the plant is deficient in water, the sunny weather just after the cold current should be selected, and drip irrigation under film or small water under film should be used. Strictly control watering in cold weather, and prevent cultivating cold. The method of using shallow middle ploughing to break up wet soil to control water transpiration, raise ground temperature, and promote root absorption capacity.

2. The photosynthetic capacity of the leaves in snowy days is reduced, and foliar fertilizer can be appropriately sprayed to supplement nutrients. It is recommended to use biological amino acids or biological potassium bacterial fertilizer and humic acid to supplement nutrition.

3. Foliar spraying of biostimulant to improve cold resistance of plants. Foliar fertilizer can be sprayed and alginic acid can be added at the same time, such as 20ml of Amez, 15ml of Azeb sprayed with 15 liters of water, or 20ml of Amez, 10ml of Tubaokang sprayed with 15L of water, can increase The sugar content and hardness of the mesophyll can alleviate the degree of frost damage.

4. Ventilation and dehumidification to prevent diseases

The photosynthesis of plants is reduced in snowy days, and the resistance to stress is reduced. At the same time, low temperature and low light increase the humidity in the shed, which is likely to cause diseases. Reasonable ventilation and dehumidification should be used to control the occurrence of diseases.

1. Due to the slow evaporation of water in the snow shed, it is forbidden to perform operations such as cutting branches, thinning flowers, spraying drugs, picking fruits, etc., so as to avoid causing germ infection caused by wounds and causing diseases.

2. On cloudy and snowy days, the respiratory consumption of vegetables is greater than photosynthesis, and a large amount of harmful gases such as carbon dioxide will accumulate in the greenhouse. Therefore, when the weather is more than 3 days in the cloudy and snowy day, it is necessary to let out the air for 1 hour when the snow stops at noon. moisture.

3. After the snow suddenly clears, the weakly growing vegetables are suddenly irradiated by strong light, and the plants will quickly lose water, causing the leaves to wither, fall, fall, or die. For fruits and vegetables, when the local temperature is below 10 ° C, the growth and absorption of the root system basically stop. After snow, the weather is fine. If the grass is removed immediately, the temperature of the shed will increase rapidly, the light will increase, and the plant will transpiration a lot of water, and the root system will be unable to meet the transpiration of the leaves under the condition of very weak water absorption. If the measures are not taken in time, it will 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 pull it full when you uncover the grass, and perform a "back curtain" to prevent sudden strong light exposure after a long period of low temperature and weak light, resulting in physiological wilting.

4. Vegetable mildew, sclerotinia, black spot disease, late blight and other diseases are very easy to occur under low temperature and high humidity. When controlling these diseases, it is advisable to use aerosols such as chlorothalonil and sclerocrine, which is conducive to uniform application Without increasing the indoor air humidity.

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