Snowfall often causes adverse effects on the growth of greenhouse vegetables. Lighter vegetables cause poor growth, and heavy ones crush the greenhouses and freeze vegetables. Therefore, vegetable farmers should do a good job of prevention work and management after snow and snow according to the weather forecast.
I. Management measures for greenhouse vegetables before snow
1. Check the greenhouse facilities to ensure the insulation performance of the greenhouse. Mainly check the damage of the shed film, the solid condition of the scaffold, the insulation effect of the shed, and whether the laminating line is tight, etc., and find measures to solve the problem in time.
2. When encountering a cloudy day, as long as the temperature is not very low, you should uncover the grass every day and see the light. The time for exposing the time can be appropriate later. The time for the cover can be earlier, as long as the temperature of the shed does not fall or rises slightly, The time of seeing light should be extended appropriately. If the temperature drops slightly after the exposure, it should be uncovered for 1 to 2 hours before or after noon.
3. Moderate water control. Moderate water control is very important to reduce the relative humidity of the air in the shed, which can reduce the occurrence of diseases.
Second, the management measures of greenhouse vegetables in the snow
1. Rainfall during the day, if the temperature is not very low, do not fall into the grass, roll up the grass and cover it with old plastic film to prevent the snow from getting wet.
2. If the snowfall temperature is low during the day or snowfall at night, the grasshopper should be dropped, and a layer of old shed film without holes should be placed on the grasshopper to prevent snow from wetting the grasshopper.
3. If the snowfall is large, the snow on the shed should be cleaned separately during the snowfall to prevent the snow from being too thick to crush the shed.
4. When the snow is insufficient, the photosynthesis of the vegetables is weak, and the photosynthesis products are few. In order to reduce the respiratory consumption, the night greenhouse temperature should be 2 °C ~ 3 °C lower than the nighttime temperature.
5. In the case of even cloudy weather, vegetable greenhouses are less ventilated and often accumulate harmful gases. Therefore, in the snowy days, the wind should be released for 1 hour at noon.
3. Management measures for greenhouse vegetables after snow
1. After snow, it is necessary to remove the snow on the film to increase the transparency and the amount of light.
2. When the yin and rain and snow are clear, don't uncover the grass scorpion. The first three days should be unveiled, and the exposed area will gradually increase. It can be opened by one or three grass rafts. One method makes the vegetables gradually see the light, avoiding the seedlings to beat the seedlings, paying attention to the observation after the exposure, and discovering that the vegetables are snoring, and immediately covering the grasshoppers with a part, so that it is repeated several times or even a few days, the number of the invention is reduced from More, so that the vegetables grow normally, usually after 3 days to fully uncover. For greenhouses using roller blinds, the haystacks can be rolled up to the middle of the shed and rolled down as appropriate. Otherwise, the vegetables in the shed have insufficient light for a few days, and the leaves are thin and tender. After sunny days, the light is strong and the amount of transpiration is large. It is easy to make the leaves lose water and wilting, and there is a flashing phenomenon.
3. Foliar spray fertilizer. For shed vegetables with heavy damage and weak growth after snow, spray 1 or 2 times with 1% glucose solution to promote the recovery of seedlings as soon as possible. For the lightly affected shed, spray 1 or 2 times of nutritive foliar fertilizer.
4. Repair the greenhouse. For greenhouses that collapse or fall half after a snowstorm, it is necessary to take time to repair the reinforcing skeleton and the shed film. The shed film around the greenhouse should be pressed with mud, and the loopholes in the greenhouse should be filled with tape.
5. Freezing and timely remediation. For shed vegetables that suffer from freezing damage, low temperature and low light can be used as the main management measures on the basis of cutting off dead branches and artificial water spray to prevent the temperature from being too high and the light to be too strong to cause dead seedlings. According to the situation, the lighting time and temperature will be gradually increased, the management of fertilizer and water will be strengthened, and the seedlings will be gradually restored. Timely control of pests and diseases, after the vegetables resume growth, enter normal management.
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