What should I do with the greenhouse in windy weather?
In windy weather during the day, if the film pressing line is not tight and the wind speed increases, the film on the front roof is easy to bulge. With the change of wind speed, the film keeps bulging and falling, which will damage the film or even leave it uncovered for a long time, hurting crops.
When the greenhouse encounters uncontrollable strong wind, it can temporarily cover some grass and press the film. If you can't control the ups and downs of the film after covering with grass, you can spray water on the grass. When the shed film is in danger of being uncovered, several sandbags can also be properly pressed on the film.
Pay attention to observation when encountering windy weather at night. If the grass is torn apart by the strong wind, the temperature in the greenhouse will drop rapidly, which is the most prone to freezing injury. In this regard, it is necessary to cover the film with straw again in time, and the strong wind cannot leave people.
Plastic films should also be protected. If the windy weather is known in advance, a film can be rolled in the straw mat when the straw mat is pulled during the day, so as to prevent the film from being blown away by the strong wind. For a shed without roller blinds, after the film is pulled during the day, it can be rolled into a ball and pressed with a covering such as sandbags to prevent it from being blown away by the wind. After putting grass at night, be sure to cover it with plastic film and press it.
For the seriously damaged greenhouse film, vegetable farmers should replace it in time. At present, most vegetables have been planted in autumn, so vegetable farmers should be careful in the process of changing the film so as not to affect the normal growth of vegetables. It's best to choose sunny days when replacing greenhouse films, because it has the least adverse effect on vegetables.
Before changing the film, it is necessary to widen the air outlet and strengthen ventilation to make the temperature inside the shed as consistent as possible with the temperature outside the shed. This is very important, because the temperature and humidity inside the shed are often higher than outside. If the greenhouse film is directly replaced without ventilation first, it is easy to cause seedling flash. Therefore, before changing the film, be sure to pull the air outlet to the maximum, let the air out for more than half an hour, and let the temperature inside the shed approach the temperature outside the shed.
At the same time, before changing the membrane, we should also pay attention to the external wind direction. If the wind is too strong, don't change the film first, so as not to be blown by the wind during the film changing process. When changing the film, try to change the film in the shortest time, because the longer the time is delayed, the greater the influence of the external environment on vegetables, which is not good for vegetable growth.
For the shed film that is not seriously damaged, it should be repaired in time, and transparent tape or special shed film adhesive can be used for repair.