The Secretary-General of the Hebei Vegetable Society, Ruan Baojin, talked about the management of solar greenhouses in view of the severe weather caused by snowfall. First, preventative measures: In the sunshine greenhouse's lighting insulation conditions are met under the premise, in order to make the vegetables in the shade sunny days are not harmed, passive management will not achieve good results, so it should be rainy, in the early stage Take precautionary management measures: 1. Choose varieties that are resistant to low temperature and low light, for example, cucumbers use Jinchun No. 3, tomato selection Zhongza No. 9, siberica selection of jade, sweet pepper selection of Yanyan No. 6, eggplant selection of tomato Number eight and so on. 2, cold treatment during germination. During seed germination, according to the lowest temperature that different vegetables can bear after the seeds germinate, low temperature treatment can greatly improve the cold resistance of vegetables in deep winter season. 3, grafted for root. After several consecutive days of overcast snow, we could not open the grass weeds, but we did not see sunlight. The greenhouse heat was not supplemented. After a large amount of soil heat storage was lost, the ground temperature was reduced to below the adaptable temperature of the vegetables, and the root system was damaged, resulting in disease. By changing the roots, the cold-resistance of the root system can be greatly improved and the hazards of disaster weather can be avoided. Cucumbers, eggplants, tomatoes, and siberians can now be grafted. 4. The application of organic fertilizer can increase the heat capacity of the soil and reduce the temperature brought about by the loss of heat from cloudy days. It can also promote the ability of the root system to increase cold resistance. 5, the rational use of water. It is very important for greenhouse vegetables to produce warm vegetables in the deep winter, moderate water control before winter, and reduce the relative humidity of indoor air. At the same time, it creates an environmental condition where the bottom is damp and the topsoil is dry. If watering is required, it must be under-membrane irrigation and watering on a sunny morning. Second, the process of management: 1, adhere to even the snow covered uncovered. When the snow does not fall on a cloudy day, the grass must be uncovered and valuable scattered light must be obtained, because the light above the light compensation point of the vegetables can carry out photosynthesis. Specific management is only covered by an hour earlier than the sunny expo. In the snow days, it is impossible to open the haystacks and cover the grasshoppers with plastic film to prevent the grasshoppers from soaking in the water and lose their heat insulation. 2, look at the temperature management. In the case of cloudy days, the photosynthesis of vegetable crops is very weak, and the photosynthetic products synthesized are few. In order to reduce respiratory consumption, the temperature must be lowered. The nighttime is usually 2-3°C lower than the sunny days. Take the cucumber as an example. The general weather requirement is not lower than 8°C at night, and it should be no less than 5°C at night on overcast snow days. It will not appear for short-term 3°C or more. Freezing damage. 3, ventilation at noon. In the case of continuous cloudy snow days, because the respiratory depletion is greater than photosynthesis, the greenhouse will accumulate a large amount of harmful gases that are mainly carbon dioxide. Therefore, for three days or more during cloudy days, the top wind should be released for 1-2 hours at noon. Depending on weather conditions. Third, the management after the sunny days: in the continuous cloudy days for many days, once the storm, after uncovering the grasshopper, the room temperature quickly increased, the vegetable leaves transpiration suddenly increased, while the ground temperature is low, the root activity is still very weak, Transpiration cannot be replenished, and the leaves will quickly appear wilting. If measures are not taken in time, they will develop further from temporary wilting to permanent wilting and eventually die. Therefore, we must pay attention to observing the storm after sunny days, and find wilting. Immediately put down the grass and reopen it before reopening it. After several iterations, we will not unravel it and then uncover all. The next day should also pay attention to observation, and if there is wilting, we should also look back. Generally after three days can really be assured.
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