In recent days, persistent weather such as continuous low temperature, rain, snow and sunshine has shown a tendency of multiple occurrences, causing great losses and serious impacts on the production and supply of vegetables in greenhouses. In order to reduce disasters to a minimum and enhance the ability to respond to severe winter storms and snows in winter, the following countermeasures have been proposed:
1. Increase lighting and increase the temperature of the greenhouse. One is the hanging reflective film. Aluminized mirror reflective film about 1 meter wide at the north side of the greenhouse or at the back wall of the solar greenhouse can increase the illuminance from 0 to 3 meters from the reflective film by 9% to 40%, and the temperature increases by 1°C~3. °C, the ground temperature increased by 0.7 °C ~ 1.9 °C, can greatly improve the light and temperature conditions of cultivated northern and central crops, and is conducive to resisting low temperature and low temperature disasters. The second is to install plant fill light. After the straw is put down, the fill light (incandescent light) is turned on. According to the weather conditions, the light is added for 3 to 5 hours to reduce the incidence of disease in the greenhouse.
2. Reduce humidity and control diseases. In deep winter or low-temperature rain and snow weather, the air in the greenhouse has high humidity and is prone to induce damage. It is forbidden to use flood irrigation. It is advisable to pour less water and dilute it. It should be ventilated and ventilated at noon for a short time to control the occurrence of diseases. Special attention must be paid to greenhouses. °C ~ 25 °C temperature range The relative humidity of the air should be controlled below 90%. After the onset, aerosol or dust can be used for prevention and treatment.
3. Spray a protective agent such as nutrient solution to prevent the occurrence of diseases. In order to prevent wilting of vegetables after being uncovered, one or two foliar fertilizers may be sprayed to supplement nutrients, and a broad-spectrum fungicide for preventing fungal diseases such as downy mildew may be added to the leaf fertilizer to enhance the disease resistance of the plants. Cold resistance.
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