First, when encountering severe cold

In the case of severe cold, the following methods can be used for emergency response. One is multi-layer cover, which can be covered with a film on the grass, or can be shed in the shed to increase the heat preservation effect. Second, the cold ditch is dug outside the shed. It can increase the temperature in the shed by 2-3 degrees. Do not water the water, the water temperature in the winter is too low, when the cold weather changes, the shed will not see light, the shed temperature is low, the ground temperature is difficult to recover, it will cause the rotten roots of the vegetables, the dead roots or the roots and the spread of various diseases. .

Second, when encountering yin

If you encounter a cloudy weather, as long as the temperature is not too low, you must uncover the straw curtain. If there is a short time to expose the sun, the temperature inside the shed will rise. Reflective curtains are placed on the back wall of the greenhouse, which also plays a role in adding light and warming on cloudy days. When there are many cloudy days in winter, the mulch film should be covered early, which can increase the ground temperature and reduce the occurrence of low temperature freezing damage. The temperature in the winter greenhouse should be kept above 12 °C. When the temperature is too low, temperature heating measures such as electric heating and coal furnace heating can be adopted.

Third, when encountering snowfall

It is not necessary to cover the grass when it is snowing during the day. After the snow stops, the snow on the shed is swept away. After the cover is covered in the afternoon, a film is placed on the grass to strengthen the insulation. During the snowfall at night, it is necessary to sweep the snow in time after the snow stops, keep the grass dry, and let the seedlings see the light when the temperature permits. After a continuous cloudy and snowy weather, it should turn sharply. It should be pulled first or first one third, and observe the change of seedlings. When it is found to be wilting, cover the grasshopper immediately, then pull it back after recovery to prevent "flash shed". ". If it has caused wilting, it should be immediately sprayed on the leaves to relieve the stomata, so as to close the stomata of the leaves and weaken the transpiration of the vegetables, which is beneficial to the rapid change of the wilting state and return to normal.

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