1. Increase lighting. (1) The pollution on the film should be cleaned every day to ensure a high transmittance of the plastic film; an aluminum-plated mirror reflective film with a width of about 1 meter should be hung at a distance of 5 cm from the back wall of the greenhouse to improve the illumination of the crops in the northern and central parts of Hebei Province. It can increase the illuminance from 0 to 3 meters from the reflective film by 9% to 40%. (2) Grasshoppers should be exposed as soon as possible to cover the night, try to extend the vegetables to see the light time; cloudy snow days, according to the outside temperature conditions can be uncovered at noon short time grasshoppers, so that vegetables receive scattered light, can not be opened for several days Grasshopper. (3) When cloudy or haze weather exceeds 2 days, appropriate artificial light may be applied. The use of plant growth lamps fills the light better. 2. Insulation and cold protection. (1) Install a suitable thickness of insulation cover. The outside of the grasshopper is covered with a plastic film or a color strip cloth to prevent the grasshopper from being wetted by rain (snow) and reduce the heat preservation effect, and at the same time facilitate the removal of snow. (2) increase the built-in thermal insulation facilities. Without affecting the light transmittance, add a layer of insulation curtain in the shed; add a thick cotton curtain in the buffer room and the greenhouse with the connection, set the isolation door in the greenhouse, while minimizing the number of access to the greenhouse. (3) Take measures to increase the temperature. The use of increased organic fertilizer and organic materials, sorghum, plastic film, wide and narrow rows of cultivation and other measures to increase the ground temperature 3 ~ 4 °C. (4) Artificially assisted heating. In the case of continuous snowfall or hazy weather, when the temperature in the greenhouse continues to drop below 5°C, a hot blast stove or electric hot air may be used to make up the temperature, or the ground heating line may be laid in advance, and the ground temperature may be increased if necessary. 3. Water and fertilizer management. The water management of vegetables in winter facilities should be controlled, micro-drip irrigation should be adopted, and water should not be poured when fog and haze weather occurs. Fertilization is dominated by organic fertilizers, and NPK fertilizers and calcium fertilizers are appropriately added. At the time of haze, it is possible to spray 0.3% potassium dihydrogen phosphate plus 0.3% calcium nitrate plus 1% glucose solution. 4. Adjust the plants. When the plant growth is weak, appropriate thinning and fruit thinning should be carried out, and early harvest should be carried out in a timely manner to reduce the burden on the plant. When the plant grows vigorously, more fruits should be kept and appropriate harvesting should be carried out late to prevent overgrowth of nutrients. 5. Integrated pest management. Covering the film to reduce the evaporation of the ground to reduce indoor humidity; timely removal of old leaves, diseased leaves; use of smoke or dust agent to prevent pests and diseases. 6. To avoid the danger of sudden fineness after a few days of haze. It is necessary to pay attention to adopting intervals and alternately exposing and dispelling grasshoppers. It is not possible to immediately uncover all grasshoppers and avoid the loss of water and wilting under strong light. If you find that the leaves are wilting, cover the grass cover and wait until the plants recover.
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