Fog is a common weather phenomenon in winter. The cloudy and foggy weather is often accompanied by low temperature, high humidity, and low sunshine. It is extremely unfavorable to the growth of greenhouse vegetables and easily induces pests and diseases. Therefore, management must be strengthened.
1. Insulation and antifreeze
In foggy weather, increase the covering to prevent the vegetables from freezing. The cover should be uncovered late. After uncovering, pay attention to the temperature change. If it drops slightly, it should be uncovered and covered; if it rises slightly, the cover can be re-covered before 2pm. If the temperature in the shed continues to drop, manual heating is required. After a continuous cloudy and foggy day, pay attention to the changes of the seedlings. After removing the cover, pay attention to the changes of the seedlings. When the wilting is found, the seedlings should be covered immediately, and then uncovered after recovery, and then covered again after the wilting. Repeatedly after 2 to 3 days, it can be transferred to normal management.
Two, increase light
Keep the shed film clean and increase light transmission. Strengthen the management of the greenhouse cover, and make full use of the scattered light of the cloudy sky to enable the photosynthesis of the plants through timely removal and timely cover. If necessary, 3 40-watt fluorescent lamps can be put together and hung 45 cm away from the seedlings, or a 100-watt high-pressure mercury lamp can be hung 80 cm away from the seedlings for artificial lighting.
Three, control humidity
Vegetables in greenhouses must be watered strictly from beginning to end, especially in foggy days. Generally, do not water them to prevent root damage. If the humidity in the shed is too high, it should be ventilated and dehumidified in time; if it is not ventilated, you can sprinkle wood ash or fine dry soil between the rows to absorb moisture.
Four, scientific medication
To prevent and control vegetable diseases and insect pests in greenhouses on foggy days, attention should be paid to the selection of symptomatic and highly effective pesticides, and the smog or dust method should be used as much as possible to apply the pesticides. If spraying is used, the frequency of prevention and treatment should be minimized to reduce the humidity in the shed.
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