The cooling of snowfall has adversely affected the growth of greenhouse vegetables. In combination with the growth characteristics of vegetables in winter greenhouses, the following emergency technical measures are proposed:
1, after the snow to remove the film on the snow cover, increase the transparency and the amount of light; as long as the temperature does not cause a sharp decline after the exposing of the shed temperature, it should be revealed every day.
2, continuous rainy days also have to use high temperatures during the noon hours of the day, timely removal of sheds and other grass cover to allow crops to see the light for a short time, and timely ventilation and humidity.
3, after the snow suddenly sunny air shelter should pay attention to the curtain. In the case of sudden sunny weather after snowfall, attention should be paid to the back-curtain, that is, to reduce the temperature of the room by slowly removing a few grasshoppers, and observe the performance of the leaves. If the leaf is normal, then gradually increase the number of uncovered curtains until all are uncovered. If a wilting phenomenon is found, a few straw curtains should be promptly covered to allow the crop to adapt.
4, science supplement fertilizer after snow. The greenhouses that need to make up the fertilizer will be sprayed on sunny days at noon. The leaves will be sprayed in a timely manner with 1.8% love water agent 4000 to 6000 times liquid, 0.2% potassium dihydrogen phosphate solution, etc., or appropriate amount of quick-acting fertilizer to supplement nutrients. Plant quality, prevent and mitigate freezing injury. However, the use of nitrogen fertilizers should be controlled so as to avoid excessive absorption of nitrogen and anti-potassium fertilizers to cause physiological deficiency.
5, pay attention to prevent various diseases. Due to the continuous rainy weather in winter, the plant growth is weak and the quality is poor. In addition, the humidity in the greenhouse is high and the diseases are easy to occur. The dead stems and frozen stems and leaves should be promptly removed to reduce the incidence of disease. Once the disease is found, it is best to use aerosol or dust agent to prevent and control, to prevent the increase of greenhouse humidity due to treatment. Sclerotinia, gray mold, and powdery mildew can be controlled. The agent can be selected from 10% procymidone or 45% chlorothalonil, 200-250 grams per acre, sealed immediately after being ignited with dark fire in the evening. Smoke overnight, the next day to open the door ventilation, or with 6.5% methylmyrimidine ultrafine dust agent 1 kg per acre control. When eggplants and tomatoes are spotted, 0.1% of 50% acetaminophen suspension can be added to the “stained liquidâ€.
6. Two curtains hang in the greenhouse, the thickness of the grasshopper is increased outside, and the insulation is kept cold.
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