How to prevent greenhouse damage
The suitable humidity for growing vegetables in greenhouses is: 50% to 60% during the day and 80% to 90% during the night. In the actual production process, the humidity in the greenhouse is much higher than this index, and dehumidification measures should be taken. First, ventilation and cooling After each irrigation, under the premise of not affecting the temperature, it is necessary to increase the ventilation volume and increase the ventilation time. Second, scientific irrigation to take the ditch, open the hole irrigation or drip irrigation, irrigation and other irrigation methods to avoid flood irrigation. Third, mulching vegetables in the greenhouse after the seeding period and cover film. It can not only increase the ground temperature, but also reduce the evaporation of soil moisture and reduce the humidity in the greenhouse. Fourth, regular cultivating and cultivating can cut off the soil capillary, inhibit the evaporation of soil moisture, with a good effect of dehumidification. V. Pay attention to the ways of using drugs to prevent and treat diseases and insects. Use smog method and dust method as far as possible to avoid high moisture in greenhouses caused by conventional spraying methods. 6. Rain-proof and snow-proof shelters should be controlled for watering 3 to 4 days before filming, and the snow on the film should be removed promptly after snowing. When it is found that the film is damaged, it must be glued in time to prevent rain and snow from leaking.