The greenhouse vegetable is sensitive to low temperature, especially in the deep winter season, the greenhouse vegetable production will often encounter bad weather conditions such as low temperature cold tide, frost, frost, snow and ice. If improper management and protection, it will cause freezing damage to vegetables, and bring more vegetables to farmers. Big economic loss. In the greenhouse vegetable frost protection management should start from 5 aspects.
First, antifreeze in advance irrigation. Before the onset of wind and snow cooling, irrigation of vegetable land in a timely manner can prevent the ground temperature from drastically decreasing and mitigate the degree of freezing damage, especially for preventing dry freeze. Irrigation should be thoroughly irrigated and pourable. It is advisable not to accumulate water on the surface of the plant. After the irrigation, it is necessary to seize the favorable opportunity to carry out planning to increase the temperature of the ground.
Second, dig a cold ditch. Dig out the cold-proof ditch around the shed. The depth is based on the local permafrost. The width is 50-70 cm. It is filled with horse dung, sawdust or straw, straw, etc. The top cover is compacted and the cold-proof ditch is slightly higher than the ground.
Third, add light. Enhancing and supplementing the light in the shed is very important for ensuring the normal growth of vegetable plants. A reflective film can be hung on the back wall of the studio to increase the light intensity of the cultivation bed; fluorescent lamps can also be installed in the shed to turn on the light for about 3 hours in the morning and in the evening on a cloudy snow day. The temperature inside the shed can be increased, and photosynthesis of vegetable plants can be promoted.
Fourth, adjust the air content. In the cold season, due to the low temperature and low ventilation and ventilation, the shed interior is almost closed. Therefore, it is easy to cause high oxygen concentration in the air and serious shortage of carbon dioxide, which has a certain impact on the photosynthesis of vegetable plants. Cold resistance will be greatly reduced. Therefore, the concentration of carbon dioxide in the shed should be supplemented. Smoke, sulfuric acid and ammonium bicarbonate can be used to adjust the air content in the shed and increase the carbon dioxide content. This can significantly increase the cold resistance of the vegetable plants.
Fifth, strengthen post-snow management. In cloudy snow conditions, when the outdoor temperature is about minus 10 degrees Celsius, the temperature inside the greenhouse is generally around 16 degrees Celsius, and the temperature difference between inside and outside is relatively small. However, once the weather is fine, the temperature in the shed indoors can rise above 30°C. At this time, it should be repeated in a timely manner, so that the indoor and outdoor temperature difference between the shed and the previous few days, and then slowly warming, so that vegetable plants have a slow adaptation to the external environment, and then return to normal growth. Otherwise, it will cause "10-day suppression, 1 day-long growth" and cause flash seedlings, so that when it is cooled again, it will be prone to frost damage.
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