In winter and early spring, using greenhouses to cultivate celery, often encounter severe weather such as cloudy days, strong winds, rainfall, snowfall, etc. Inadequate indoor lighting, lower temperatures, and increased humidity seriously affect the photosynthesis of celery, which affects the quality of celery, so Management must do the following: 1. Without affecting the celery's temperature requirements, the grass should be uncovered during the day so that the celery will not see the curtain for a few days. 2. In the event of a windy day, we must pay attention to windbreaks and firmly press the straw curtains to prevent them from being blown away by the wind and freezing the celery plants. In order to prevent the wind from blowing the film and damaging celery during the day, stop the ventilation. 3. When snow falls in winter and the temperature is low, it is necessary to prevent freezing and freezing at night and pay attention to insulation coverage. When the weather is suddenly clear after the snow, avoid sudden exposure of celery to light, especially when the celery plants have been slightly frozen. When some plants have fallen to the ground, part of the straw can be rolled up on sunny days, so that the temperature inside the shed slowly increases. After the frozen celery is frozen and erected, the remaining straw is rolled up again. 4. In cloudy and snowy days, watering should be stopped to avoid lowering the soil temperature and increasing the humidity in the greenhouse. When snowfall is heavy, snow should be removed in time to avoid squashing.
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